radiation dosimetry A measurement of the amount of ionizing radiation exposure by individuals, materials, or equipment at a specific location.. radiation survey An evaluation of the radi
Trang 1Vincoli, Jeffrey W "Q-Z"
Lewis' Dictionary of Occupational and Environmental Safety and Health
Edited by Jeffrey W Vincoli
Boca Raton: CRC Press LLC, 2000
Trang 2An rickettsial infection often seen among
meat and livestock handlers Can be
con-tracted by inhalation of dust particles that are
infected with the infectious organism The
organisms are found in the hides of sheep and
cattle It is contagious between humans and
its symptoms include sudden hay fever, chills,
headache, muscle pain, and coughing
A pretender to medical skill which he/she
does not possess One who practices as a
physician or surgeon without adequate
experi-ence or due qualification
quad map
A topographic map with an approximate scale
of one inch to 2,000 feet; shows physical
features such as wetlands, water bodies,
roadways, mines, and buildings
quadrant
(1) One-fourth of the circumference of a
cir-cle (2) An angular dissection of ninety
de-grees (3) One of the quarters created by two
intersecting lines, roads, streets, vectors, etc
(4) One of four corresponding parts, or
quar-ters, as of the surface of the abdomen or of the
field of vision
quadrantanopia
Loss of vision in one fourth of the visual field
quadriceps
Having four heads
quadriceps femoris muscle
A muscle group on the anterior thigh ing of four muscles which flex the hip andextend the knee: rectus femoris, vastus later-alis, vastus medialis, and vastus intermedius
consist-Well-defined quadriceps femoris muscles of the anterior thigh
quali-qualification tests
The required tests used to demonstrate that thedesign, manufacture, and assembly have re-sulted in hardware conforming to specifica-tion requirements
qualified
Adapted; fitted; entitled; susceptible; tent; fitting; possessing legal power or capac-ity; eligible Applied to one who has takenthe steps to prepare himself/herself for an ap-pointment of office One who is adequatelyand satisfactorily trained and/or experienced
compe-to perform a function or task
qualified handicapped individual
Under the Americans with Disabilities Act(ADA): A handicapped individual who is ca-pable of performing a specific job with rea-sonable accommodation
Trang 3qualified operator
A worker having the adequate physical/mental
attributes, training, education, and experience
who has demonstrated that he/she is capable
of safely performing a given task involving
the operation of machinery or equipment with
acceptable quality and quantity
qualified person
One familiar with the construction and
opera-tion of the equipment and the hazards
in-volved Note 1: Whether an employee is
con-sidered to be a "qualified person" will depend
upon various circumstances in the workplace
It is possible and, in fact, likely for an
indi-vidual to be considered "qualified" with
re-gard to certain equipment in the workplace,
but "unqualified" as to other equipment Note
2: An employee who is undergoing
on-the-job training and who, in the course of such
training, has demonstrated an ability to
per-form duties safely at his/her level of training
and who is under the direct supervision of a
qualified person is considered to be a
quali-fied person for the performance of those
du-ties
qualified worker
A worker having the adequate physical/mental
attributes, training, education, and experience
who has demonstrated that he/she is capable
of performing a given task using basic tools
with acceptable quality and quantity
qualifying phase I technology
Under the Clean Air Act (CAA): A
techno-logical system of continuous emission
reduc-tion which achieves a 90 percent reducreduc-tion in
emissions of sulfur dioxide from the
emis-sions that would have resulted from the use of
fuels which were not subject to treatment
prior to combustion
qualimeter
An instrument for measuring the quantity of
roentgen rays generated by a Coolidge tube
qualitative
The characteristic attributes or qualities
per-taining to an exposure based on subjective
in-formation, nonrigorous quantitative data, and
judgment
qualitative exposure assessment
The identification of contaminants and
physi-cal agents an individual may be exposed to,
and a judgment of the associated hazard based
on the frequency and duration of exposure,the control measures in effect (engineering,administrative, and personal protection), theproperties of the stressor, and the manner inwhich it is being used/handled
qualitative risk assessment
An examination of system risk based uponestablished criteria that allows the analyst toevaluate risk levels in relation to other risks ortotal system risk
quality
A condition in which a product satisfies a set
of requirements involving such aspects asstrength, durability, function, appearance, anduser-satisfaction
quality analysis
An examination or study of product qualitygoals
quality assurance (QA)
(1) A company-wide program that establishesproject policies, procedures, standards, andguidelines designed to produce an acceptablelevel of professional quality (2) A system ofpractices, procedures, and activities that aretaken to provide assurance that the work be-ing carried out will meet defined standards ofquality The assessment of the potential for aprocedure to produce sampling results of ade-quate quality to satisfy the defined objectives.The primary purpose of a quality assuranceprogram is to provide the necessary safe-guards to minimize erroneous sample analy-ses and to provide a means of detecting errorswhen they occur
quality assurance project plan
As per the Environmental Protection Agency(EPA): A plan that describes the policy, or-ganization, functional activities, and qualityassurance and quality control protocols neces-sary to achieve DQOs dictated by the in-tended use of the data (RI/FS Guidance)
quality assurance/quality control
According to the U.S Environmental tion Agency (EPA): A system of procedures,checks, audits, and corrective actions to en-sure that all EPA research design and per-formance, environmental monitoring andsampling, and other technical and reportingactivities are of the highest achievable quality
Trang 4Protec-quality circle (QC)
A small group of people involved in a similar
type of work who voluntarily meet on a
pre-determined schedule (e.g., weekly) on paid
time in an attempt to identify, analyze, and
solve some of the problems in their work
en-vironment Also referred to as quality
con-trol circles and employee participation team.
quality control chart
A chart used for recording data regarding
product quality
quality control (QC) programs
Establish project activities that apply the
poli-cies, procedures, standards, training,
guide-lines, and systems developed in the QA
pro-gram QC programs aim to maintain an
ac-ceptable level of project quality through
ap-plication of sound project management
prin-ciples and practices
quality factor
(1) General A measure for expressing the
rate of attenuation (sharpness) of time-varying
energy as a function of frequency Also
re-ferred to as Q factor (2) Ionizing Radiation.
A modifying factor that is used to derive the
radiation dose equivalent from absorbed dose
It is a factor by which the absorbed radiation
dose in rad is multiplied to obtain a quantity
that expresses the biological effectiveness of
the absorbed dose in rem The factor for beta,
gamma, and X-radiation is 1 For alpha
parti-cles and fast neutrons it is 10 Other values
are used for neutrons of other energies and
heavy recoil nuclei (3) Ionizing Radiation.
The number intended to represent the
effec-tiveness of various types of ionizing radiation
based on relative biological effectiveness or
linear energy transfer, based on the following
The lowest level at which a chemical may be
accurately and reliably quantified Usually
equal to the detection limit multiplied by a
factor of 3 to 5, but varies between chemicals
and between samples
quantitative
The property of anything which can be mined by measurement and expressed as aquantity
deter-quantitative exposure assessment
The procedure of quantitatively determining
an individual's exposure to a health hazard,employing accepted sampling and analyticalprocedures, and assessing the likelihood that
an adverse health effect may occur based onthe sample results
quantitative risk assessment
An application of statistical techniques tomathematically identify the level of probablerisk associated with a given hazard, as it re-lates to total system operation
quantum
The smallest quantity of energy, responding
to the energy of electromagnetic radiation,that can be associated with a given phenome-non
quantum theory
A theory based on the concept that energy isradiated intermittently in units of definitemagnitude called quanta and absorbed in likemanner
quarantine
(1) A place or period of detention of shipscoming from infected or suspected ports (2)Restrictions placed on entering or leavingpremises where a case of communicable dis-ease exists (3) The application of measures
to prevent contact between persons who arenot infected and persons suspected of beinginfected
quarrel
An altercation, angry dispute, or an exchange
of recriminations, taunts, threats, or tions between two persons
See also malaria.
quarter
The fourth part of anything, especially a year
Trang 5quarter line
A line used to set a boat out where
maneuver-ability is limited
quarter section
The quarter of a section of land according to
the divisions of a government survey,
deter-mined by dividing the section into four equal
parts by north and south and east and west,
and containing 160 acres (a quarter of a
square mile of land)
quartile
The value of the boundary at the 25th, 50th,
or 75th percentile of a frequency distribution
divided into four parts, each containing a
quarter of the population
quartz
One of the forms of crystalline silicon
diox-ide Also referred to as one of the forms of
free silica
Quaternary
The period of geologic time starting 1.6
mil-lion years ago and continuing to the present
day It is divided into two epochs: the
Pleis-tocene and the Holocene, with the division
between these two falling approximately
10,000 years before the present Late
Qua-ternary refers to time between 700,000 years
ago and the present day PQuaternary
re-fers to any time before 1.6 million years ago
quaternary
(1) Fourth in a series (2) Made up of four
elements or radicals
Queckenstedt's test
When the veins in the neck are compressed on
one or both sides there is a rapid rise in the
pressure of the cerebrospinal fluid of healthy
persons, and this rise quickly disappears when
pressure is taken off the neck But when there
is a block in the spinal canal the pressure of
the cerebrospinal fluid is affected little or not
at all by the maneuver
quench tank
A water-filled tank used to cool incinerator
residues or hot materials during industrial
processes
Quervain's disease
Inflammation of the long abductor and short
extensor tendons of the thumb, with swelling
and tenderness
questioning technique
A method for analyzing and attempting toimprove work processes, generally by askingquestions such as: a) what is the purpose forsome activity, b) why is a particular sequencefollowed, c) why does a particular personperform that job, and d) is the method beingused to accomplish the task the best possible
questionnaire
A written set of questions intended to obtain
an individual's responses on his/her attitudes,issues, etc
queue
(1) Place a discrete unit in position for quential flow in a single processing channel.(2) A location from which units may be se-lected for processing when processing time orother requisite conditions permit
se-queuing theory
A quantitative rule describing the patternspertaining to arrivals, service times, and thesequence in which arrivals are handled
quick disconnect valve
(1) Breathing Apparatus A device which
starts the flow of air by inserting of the hose(which leads from the facepiece) into theregulator of self-contained breathing appara-tus, and stops the flow of air by disconnection
of the hose from the regulator (2) Servicing and Maintenance A mechanical device, usu-
ally spring-loaded or under some type of chanical tension, that allows for the quickconnection and/or disconnection of twostructures Common in many industries, such
me-as refining, aerospace, the military, etc
Quick disconnect valves used in the fueling of aircraft allow for quick and safe connection/disconnection of fuel hose lines
Trang 6(1) A display technique involving the use oftime derivatives for aiding an operator intracking or control operations involving mo-tion (2) The first perceptible movement ofthe fetus in the uterus, appearing usually inthe sixteenth to eighteenth week of pregnancy
quinine
A white, bitter alkaloid usually obtained fromcinchona An analgesic, antipyretic, bittertonic, and effective antimalarial
quotidian
(1) Recurring every day (2) A form of mittent malarial fever with daily recurrentparoxysms
QWERTY keyboard
A keyboard with a letter distribution pattern
of QWERTY on the left side of the top row
See also Dvorak keyboard.
Trang 7An instrument for measuring and displaying
the intensity of ionizing radiation in
An acute infectious viral disease
communi-cated to man by the bite of an infected animal
and affecting the brain and the nervous
sys-tem Rabies is transmitted by warm-blooded
animals, especially dogs and foxes The viru s
i s often pres en t in th e sal iv a of affected ani mal s
and is trans mit ted chi efl y th ro u gh bi te wou n ds
and occasi on all y th rou gh op en wo un ds or
s ores After the vi ru s ent ers the bo dy it travel s
alo ng th e nerve tru n k to th e brain The farther
the bite is from the head, the longer it takes to
reach the brain The incubation period varies
from 2 weeks to as long as 6 months The
bitten person must start treatment with
antira-bies vaccine and serum before the virus
reaches the brain The disease must be
pre-vented because it is always fatal in man Also
called hydrophobia.
RAC
See risk assessment code.
race
(1) A breakdown of the human species by
certain genetically determined characteristics
such as skin color, bodily proportions, hair
type, and stature (2) A form of competition
where the purpose is to complete a prescribed
path or function with a minimal time or ahead
of others in the competition
raceway
A channel designed expressly for holdingwires, cables, or bus bars, with additionalfunctions (as permitted in applicable codesand standards) Raceways may be of metal orinsulating material, and the term includesrigid metal conduit, rigid nonmetallic conduit,intermediate metal conduit, liquid-tight flexi-ble metal conduit, flexible metal conduit,electrical metallic tubing, under floor race-ways, cellular concrete floor raceways, cellu-lar metal floor raceways, surface raceways,wire ways, and bus ways
radar air traffic control facility (RATCF)
An air traffic control facility, located at a U.S.Naval or Marine Corps Air Station, utilizingsurveillance, and normally, precision ap-proach radar and air/ground communicationequipment to provide approach control serv-ices to aircraft arriving, departing, or transit-ing the airspace controlled by the facility.The facility may be operated by the FederalAviation Administration (FAA), the UnitedSates Navy (USN), the United States MarineCorp (USMC), or the FAA & USN and serv-ice may be provided for both civil and mili-tary airports
radar air traffic control tower
An airport traffic control tower that uses radarand nonradar capabilities to provide approachcontrol services to aircraft arriving, departing,
or transiting airspace controlled by the ity It provides radar air traffic control serv-ices to aircraft operating in the vicinity of one
facil-or mfacil-ore civil and/facil-or military airpfacil-orts in theterminal area
Trang 8Radar air traffic control operations
radar altimeter
Aircraft instrument that makes use of the
re-flection of radio waves from the ground to
determine the height of the aircraft above the
surface
radar approach control (RAPCON)
An air traffic control facility, located at a U.S
Air Force (USAF) base, utilizing surveillance
and, normally, precision approach radar and
air/ground communication equipment to
pro-vide approach control services to aircraft
ar-riving, departing, and transiting the airspace
controlled by the facility The facility may be
operated by the Federal Aviation
Administra-tion (FAA), or the United States Air Force
(USAF) Service may be provided to both
civil and military airports
radar approach control tower
An airport traffic control tower (ATCT) that
uses radar and nonradar capabilities to
pro-vide approach control services to aircraft
ar-riving, departing, or transiting airspace
con-trolled by the facility It provides radar Air
Traffic Control (ATC) services to aircraft
op-erating in the vicinity of one or more civil
and/or military airports in the terminal area In
other words, a radar approach control tower is
an ATCT at which airport traffic control
spe-cialists are permitted to provide radar
ap-proach control service, including extensive
vectoring, as well as to handle takeoffs and
landings Radar acts can be separated into a
control tower and a radar room
radial deviation
A movement of the wrist such that the tudinal axis of the hand is directed toward thelateral/radial/thumb side of the forearm
longi-radial keratotomy
A surgical procedure in which radial incisionsare made in the cornea to improve myopic vi-sion
See elbow height.
radiale – stylion length
The linear distance from radiale to stylionparallel to the long axis of the freely hanginglower arm Measured with the individualstanding, the arm hanging naturally at theside, and the palm facing the thigh Also re-
ferred to as forearm length and lower arm length.
radian
A planar angular measure in which the arclength of the subtended angle at the center of
a circle equals the radius (approximately 57.3
degrees) See also plane angle.
radiance (L)
The value of the ratio of the radian flux to thesolid angle and the perpendicular surfaceprojection
Trang 9radiant energy
The energy of electromagnetic waves from
sources such as radiowaves, visible light,
in-frared, x-rays, and gamma rays These waves
do not need molecules to propagate them, and
in a vacuum they travel at nearly 300,000
kilometers per second
radiant exitance (M)
The radiant flux density leaving a specified
surface
radiant flux
The rate of flow of radiant power which flows
onto or through a unit area
radiant flux density
That amount of radiant power which flows
onto or through a unit area
radiant heat
A form of electromagnetic energy
radiant heat load
Energy that is transformed into heat when it
strikes an object The human body can both
emit and receive radiant energy
radiant heat temperature
The temperature of an object as a result of it
having absorbed radiant energy
radiant heat transfer
Radiant heat transfer occurs when there is a
large difference between the temperatures of
two surfaces that are exposed to each other
but are not touching
radiant heating
That heating which occurs solely by radiation
radiation
(1) Divergence from a common center (2) A
structure made up of diverging elements,
es-pecially a tract of the central nervous system
made up of diverging fibers (3)
Electromag-netic waves The emission and propagation of
energy in the form of waves or corpuscular
emissions of particles through space or
through a material medium; for instance, the
emission and propagation of electromagnetic
waves, electric waves, or other forms of
elec-tromagnetic radiation, as well as ionizing
ra-diation Sources of radiation include natural
or "background" radiation, such as cosmic
rays from outer space, and the naturally
oc-curring radioactive substances found in the
earth Manmade radiations result from
artifi-cially produced nuclear reactions in stableelements which are then changed to radioac-tive substances Radiations are particulateand nonparticulate; that is, that may be made
up of particles such as neutrons and protonswhich are fragments of the nuclei of disinte-grating atoms, or they may consist of electro-magnetic waves, which have no mass Par-ticulate radiations may consist of alpha parti-cles or beta particles Most radioactive iso-topes (radioisotopes) emit particulate radia-tions and at the same time also release elec-tromagnetic rays (gamma rays) Both par-ticulate and nonparticulate radiations are ca-pable of penetrating and being absorbed intomatter Alpha particles are the least pene-trating; beta particles slightly more penetrat-ing; and the gamma rays, like x-rays, are ca-pable of completely penetrating the body.Harmful effects of uncontrolled radiation ex-posure include serious disturbances of bonemarrow and other blood-forming organs,burns, and sterility There may be permanentdamage to the germ plasm or genes, which re-sults in genetic mutations The mutations can
be transmitted to future generations tion also may produce harmful effects on theembryo or fetus, bringing about fetal death ormalformations Radiation also apparentlyshortens the life span of those exposed to itover a period of time, and predisposes persons
Radia-to the development of cataracts Exposure Radia-tolarge doses of radiation over a short period oftime produces a group of symptoms known asthe acute radiation syndrome These symp-toms include general malaise, nausea, andvomiting, followed by a period of remission
of symptoms Later, the patient developsmore severe symptoms such as fever, hemor-rhage, fluid loss, anemia, and central nervoussystem involvement The symptoms thengradually subside or become more severe, andmay lead to death
radiation absorbed dose (rad)
The unit of absorbed dose which is equal to
100 ergs/g It is a measure of the energy parted to matter by ionizing particles per unitmass of irradiated material at the point of ex-posure
im-radiation accident
Any accident exposing humans to excessiveradiation or involving the spread of radioac-
Trang 10tive materials beyond their intended
contain-ment
radiation area
An area accessible to individuals, in which
ionizing radiation levels could result in a
per-son receiving a dose equivalent in excess of 5
millirem (equivalent to 0.05 mSv) in 1 hour at
12 inches (30 centimeters) from the source or
from any surface that the radiation penetrates
radiation dosimetry
A measurement of the amount of ionizing
radiation exposure by individuals, materials,
or equipment at a specific location
radiation effect
Any of the documented effects from high
lev-els of ionizing radiation exposure, such as hair
loss, cancer, nausea, cataracts, or death See
also radiation sickness.
radiation fluence
See fluence.
radiation fog
Fog produced over land when radiation
cool-ing reduces the air temperature to or below its
dew point It is also referred to as ground fog
and valley fog.
radiation hazard
A situation in which persons might receive
ionizing radiation in excess of the applicable
maximum permissible dose or in which
radia-tion damage might be done to materials
radiation inversion
An increase in temperature with height due to
radiation cooling of the earth's surface Also
called nocturnal inversion.
radiation length
The mean distance required to reduce the
en-ergy of charged particles by 1/e in passing
through a material
radiation monitoring
A form of environmental monitoring in which
periodic or continuous measurements are
taken to determine the radiation levels present
in a specific environment
radiation protection
Any measure to reduce the exposure of
hu-mans and/or equipment to radiation, whether
through legislation, regulations, policies, or
physical measures
radiation protection guide (RPG)
The total amount of ionizing radiation doseover certain periods of time that may be per-mitted to persons whose occupation involvesexposure to such radiation It is equivalent to
what was formerly called the maximum missible exposure (MPE).
per-radiation protection officer (RPO)
The person who has been selected and trained
to be responsible for overseeing the ionizingradiation protection program in a facility
Also referred to as the radiation safety officer
or RSO.
radiation safety
The study and/or implementation of ment and procedures to prevent excessive ra-diation exposure to personnel or radiation re-lease to the environment
equip-radiation safety officer (RSO)
See radiation protection officer.
radiation sickness
A self-limiting syndrome characterized bynausea, vomiting, diarrhea, and psychic de-pression, following exposure to appreciabledoses of ionizing radiation, particularly to the
abdominal region Also called radiation drome.
syn-radiation source
Materials, equipment, or devices that generate
or are capable of generating ionizing radiationincluding naturally occurring radioactive ma-terials, byproduct materials, source materials,special nuclear materials, fission products,materials containing induced or deposited ra-dioactivity, nuclear reactors, radiographic andfluoroscopic equipment, particle generatorsand accelerators, radio frequency generatorssuch as certain klystrons and magnetrons thatproduce x-rays, and high voltage devices thatproduce x-rays
radiation standards
Regulations that set maximum exposure limitsfor protection of the public from radioactivematerials
radiation survey
An evaluation of the radiation hazard incident
to the production, use, release, disposal, orpresence of a radioactive material or othersources of ionizing radiation under a specificset of conditions Includes surveys necessary
Trang 11to evaluate external exposures to personnel,
surface contamination, and the concentration
of airborne radioactive materials in the facility
and in effluents from the facility, as
An ionic group having one or more charges,
either positive or negative A group of
at-oms which can enter into a chemical reaction
but which is incapable of existing separately
See also free radical.
R a d i o Au t o m o b i l e C o m m u n i c a t i o n S y s t e m
A Japanese government/private industry
pro-ject to develop future street/highway vehicle
systems
radio contact
Aviation The initial radio call-up to a flight
service station by en route aircraft, which
in-cludes a complete interchange of information
and a termination of the contact
radio frequency (Rf)
Electromagnetic energy from 30 kHz to 300
GHz
radioactive
A property of some materials or elements that
is characterized by their spontaneous emission
of radiation
radioactive contamination
Contamination with radioactive material(s)
radioactive decay
The disintegration of the nucleus of an
unsta-ble nuclide by the spontaneous emission of
charged particles and/or photons
radioactive decontamination
The removal of contaminating radioactive
materials from a given location
radioactive device
See radioactive equipment.
radioactive equipment
Equipment or devices that generate, or are
capable of generating, ionizing radiation
in-cluding radiographic and fluoroscopic
equip-ment, particle generators and accelerators, dio frequency generators such as certainklystrons and magnetrons that produce x-rays,and high voltage devices that produce x-rays
ra-radioactive half-life
That time required for one-half the originalamount of unstable nuclei in a radioactivesample to decay
radioactive material
Materials that generate, or are capable of erating, ionizing radiation including naturallyoccurring radioactive materials, byproductmaterials, source materials, special nuclearmaterials, fission products, materials con-taining induced or deposited radioactivity, andnuclear reactors
gen-radioactive series
A succession of nuclides, each of which forms by radioactive disintegration into thenext nuclide until a stable one results
unsta-by bombarding isotopes of the element withhigh-velocity particles When an element isunstable, whether naturally or artificially, theratio of protons to neutrons in its atoms is un-even Each atom attempts to achieve stability
by giving off particles from its nucleus andthus it begins to disintegrate, releasing bothnuclear particles and electromagnetic radia-tions Since these radiations interact withmatter, including the cells of the body, they
Trang 12can be extremely harmful or, under proper
control, extremely useful (in medical therapy,
for example)
radioactivity concentration guide (RCG)
The maximum permissible amount of any
specified radioisotope that may be allowed to
accumulate in the body
radiobiology
The study of radiation effects on living things
More specifically, the branch of science
con-cerned with effects of light and of ultraviolet
and ionizing radiations on living tissue or
or-ganisms
radiocarbon
A radioactive isotope of carbon The isotope
of mass 14 (14C) is used in many diagnostic
procedures and physiologic investigations
With a half-life of 5568 years, it has provided
a means of determining the age of many
an-cient substances and articles
radiograph
A picture of an object that is made by passing
ionizing radiation through the object and
photographic film positioned on the opposite
side of the object from the radiation source
radiographer
The individual who is in attendance at a site
where ionizing radiation sources are being
used and is the user or supervises their use in
industrial radiographic operations This
indi-vidual is responsible for complying with
regulations and adherence with good practice
during the procedure
radiography
The use of penetrating radiation such as
x-rays, gamma x-rays, or neutrons, to make visual
images of the insides of objects An
exami-nation of humans or animals, or of the
struc-ture of materials by non-destructive methods,
utilizing sealed sources of ionizing radiation
or ionizing radiation-producing machines
radioisotope
An unstable isotope of an element that
disin-tegrates spontaneously, emitting ionizing
ra-diation, and yielding a different isotope
radiological health
The art and science of protecting humans,
animals, and the environment from injury or
damage from sources of ionizing radiation
and promoting better health through beneficialapplications of sources of ionizing radiation
radiology
The branch of medicine that deals with thediagnostic and therapeutic applications of ra-diant energy
radioluminescence
The emission of visible light from ionizingradiation or the decay of radioactive isotopescausing the excitation of crystals or phos-phors
radiometer
An instrument used to demonstrate the formation of radiant energy into mechanicalenergy
trans-radiometric unit
A unit of measurement for radiant magnetic energy in terms of energy or power,without regard to biological effects
radiosensitive
Term used in describing tissues that are moreeasily damaged as the result of exposure toionizing radiation
Trang 13A chemical element, atomic number 88,
atomic weight, 226, symbol Ra Radium is
highly radioactive and is found in uranium
minerals Radium salts emit, in addition to
heat and light, three distinct kinds of radiation
(alpha, beta, and gamma rays) and also a
ra-dioactive gas called radon
radius
(1) The linear distance from the center of a
circle to its edge (2) The lateral forearm
bone
radius of curvature
The radius of a circle whose arc matches a
curve or surface at a given point
radius of vulnerable zone
The maximum distance from the point of
re-lease of a hazardous substance in which the
airborne concentration could reach the level
of concern under specified weather
condi-tions
radon
(1) A chemical element formed by the
disin-tegration of radium 226 or radium 224; a
heavy, colorless, odorless and radioactive gas
(2) An inert gaseous element formed by
ra-dioactive decay of radium atoms in soil or
rocks
radon daughters
See radon progeny.
radon decay products
A term used to refer collectively to the
imme-diate products of the radon decay chain These
include Po 218, Pb 214, Bi 214, and Po 214,
which have an average combined half-life of
about thirty minutes
radon progeny
A term referring collectively to the
intermedi-ate products produced in the radon decay
chain Also called radon daughters.
raffinate
In solvent extraction, it is that portion of the
mixture which remains undissolved and not
removed by the solvent
rafter sample
A sample of settled dust that is obtained from
a rafter or other undisturbed surface that will
contain representative particulates that have
settled out of the air The sample must be
representative of the airborne dust to whichpersonnel are exposed
A rolled steel shape laid in two parallel lines
to form a track for carrying vehicles with
flanged steel wheels See also locomotive, railway, railroad, and train.
rail car
A car designed to carry freight or passenger personnel by rail, and includes abox car, flat car, gondola car, hopper car, tank
non-car, and occupied caboose See also railway car.
Typical rail car used for hauling freight
rail-highway grade crossing
A location where one or more railroad trackscross a public highway, road, or street or aprivate roadway, and includes sidewalks and
pathways at or associated with the crossing See also grade crossings and highway-rail crossing.
rail joint bond
Railroad A metallic connection attached to
adjoining rails to insure electrical ity
conductiv-rail ladder
A fixed ladder consisting of side rails joined
at regular intervals by rungs or cleats andfastened in full length or in sections to abuilding, structure, or equipment
Trang 14rail mode
Consists of freight and passenger (including
commuter) railroads See also rapid rail,
rapid transit rail, transit mode, transit
rail-road, and transit railway.
railbus
A rel at i vely li gh t, di es el-po wered , two -axl e rai l
v eh icle wi th a bo dy resembl in g that of a bu s
railing
A vertical barrier erected along exposed sides
of stairways and platforms to prevent falls of
persons The top member of a railing usually
serves as a handrail
railroad
(1) A person engaged in transportation by rail
(2) All forms of non-highway ground
trans-portation that run on rails or electro-magnetic
guide ways, including a) commuter or other
short-haul rail passenger service in a
metro-politan or suburban area, and b) high speed
ground transportation systems that connect
metropolitan areas, without regard to whether
or not they use new technologies not
associ-ated with traditional railroads Such term
does not include rapid transit operations
within an urban area that are not connected to
the general railroad system of transportation
(3) Any surface transportation system that
carries passengers, goods, materials, or
prop-erty over rails See also locomotive, rail,
railway, and train.
railroad accident
An event arising from the operation of a
rail-road which, with minor exceptions results in
one or more of the following circumstances:
a) Any impact between railroad on-track
equipment and an automobile, bus, truck,
motorcycle, bicycle, farm vehicle, pedestrian,
or other highway user at a highway-rail
crossing b) Any collision, derailment, fire,
explosion, act of God, or other event
involv-ing the operation of railroad on-track
equip-ment, standing or moving, which results in
more than $6,300 in damages to railroad
on-track equipment, signals, on-track, on-track
struc-tures, and roadbeds c) Any event arising
from the operation of a railroad which results
in the death of one or more persons; an injury
to one or more persons (other than railroad
employees) requiring medical treatment d)
An injury to one or more employees which
requires medical treatment; or results in
re-striction of work or motion for one or moredays, or one or more lost work days, transfer
to another job, termination of employment,loss of consciousness or any occupational ill-ness of a railroad employee as diagnosed by aphysician
railroad and railway electric service
Electricity supplied to railroads and interurbanand street railways, for general railroad use,including the propulsion of cars or locomo-tives, where such electricity is supplied underseparate and distinct rate schedules
railroad car mile
A single railroad car moved a distance of onemile
railroad crossing collision
A collision between on-track railroad ment at a point where tracks intersect
equip-railroad switching and terminal
A company primarily performing switchingservice, furnishing terminal trackage, bridges,
or other facilities such as union freight tions, operating ferries, or performing any one
sta-or a combination of these functions It maycoincidentally conduct a regular freight orpassenger service
railroad switching and terminal ments
establish-Establishments primarily engaged in the nishing of terminal facilities for rail passenger
fur-or freight traffic ffur-or line-haul service, and inthe movement of railroad cars between termi-nal yards, industrial sidings, etc Terminalcompanies do not necessarily operate any ve-hicles themselves, but may operate the sta-tions and terminals
railway
A permanent way having one or more rails
which provides a track for trains See also comotive, rail, railroad, and train.
lo-railway car
A railway car designed to carry freight, road personnel, or passengers This includesboxcars, covered hopper cars, flatcars, refrig-erator cars, gondola cars, hopper cars, tankercars, cabooses, stock cars, ventilation cars,and special cars It also includes on-track
rail-maintenance equipment See also rail car.
railway gauge
Distance between the rails of a track
Trang 15railway yard
An area provided with a system of tracks and
associated structures, where railway trains are
assembled, and railway cars are switched,
stored, or serviced
rain
Precipitation in the form of liquid water drops
that have diameters greater than that of
driz-zle
rain cap
A sheet-metal fixture which is placed on the
outlet of a stack/vent for preventing rain from
entering Also called a weather cap.
rain shadow
The region on the leeside of a mountain where
the precipitation is noticeably less than on the
windward side
rainbow
An arc of concentric colored bands that spans
a section of the sky when rain, fog, or water
spray is present and the sun is positioned at
the observer's back The colors are those of
the spectrum and are visible due to sunlight
passing through and refracted by the airbornewater molecules
rainbow passage
A paragraph of text, which when read, results
in the reader making a wide range of facialmovements This reading can be used for thetalking phase of the respirator fit test protocol
raking collision
Rail Operations A collision between parts or
a consist on an adjacent track, or with astructure such as a bridge
rales
Abnormal sounds in the respiratory systemindicating some type of pathological condi-tion
ramp metering
(1) The process of facilitating traffic flow onfreeways by regulating the amount of trafficentering the freeway through the use of con-trol devices on entrance ramps (2) The pro-cedure of equipping a freeway approach rampwith a metering device and traffic signal thatallow the vehicles to enter the freeway at apredetermined rate
ramus
(1) The posterior, vertical portion of the dible (2) A branch, as of a nerve, vein, orartery
man-rancid
Refers to a musty, rank taste or smell that isusually associated with fats that have under-gone decomposition
Rand formula
An agreement under which employees paydues to a union without being required to jointhe union
random
Not deterministic A variable whose value at
a particular future instant cannot be predictedexactly
Trang 16random access memory (RAM)
Computing High-speed memory that holds a
copy of the operating system, any programs
that are currently running on a computer, and
any information that is being processed
RAM is temporary memory; all information
in RAM is lost when the user turns off the
computer RAM is resident memory,
meas-ured in bytes or megabytes, of a computer
system that enables and facilitates most of the
system's base functions as well as some
higher level operating functions It is memory
located in the semiconductor chips in the
computer, not on the hard disk The more
RAM, the more programs can be run at the
same time and the faster the programs will
run
random errors
Errors which are the result of uncontrollable
or unknown sources They are the result of
variation, due to chance, that occurs in
moni-toring despite the effort to control all
vari-ables They are characterized by the random
occurrence of both positive and negative
de-viations from the mean, and these tend to
can-cel out if the sample size is sufficient
random noise
An oscillation whose magnitude is not
speci-fied and cannot be predicted with certainty for
any given instance of time
random process
A collection of all possible sample functions
which might be produced by random
phe-nomena
random sample
A sample that has been collected in such a
manner that each individual in the population
represented by the sampled individual had an
equal probability of being sampled This
con-cept can be applied to personnel, work areas,
work shifts, dates, etc The objective in
col-lecting a random sample is to obtain a sample
which is free of bias
random signal
See random process.
random variable
A real function whose value is determined
randomly Also referred to as chance
vari-able and stochastic varivari-able.
range
(1) General The distance between two
ex-tremes (e.g., the high point and the low point)
(2) Instrumentation The upper and lower
limits between which an instrument respondsand over which the instrument is calibrated.The interval between the upper and lowermeasuring limits of an instrument
range-bearing display
See B display.
range of motion (ROM)
The spatial extent through which a combination
of joints, limbs, or links can be normallymoved
rank
(1) To place a set of scores or other numericvariables in rank order (2) The location of ascore in a set of rank-ordered scores (3) Themaximum number of linearly independentrows in a matrix
rank order
A sequence in which objects are organizedsequentially by their quantitative score onsome descriptor, variable, or parameter
rank order correlation
Any non-parametric correlation test for nificance between at least ordinal-level pairedobservations in a random sample
sig-Rankine (R)
A temperature scale with zero F at 460ºRankine The freezing point of water on thisscale is 491.6ºR and the boiling point is671.7ºR
ranking crew member
Rail Operations An individual in whom the
general charge of the train or yard crew isvested in accordance with the railroad's oper-ating rules Unless otherwise designated bythe railroad, the ranking crew member will bethe assigned locomotive engineer
RAPCON
See radar approach control.
Trang 17Recommended assigned protection factor
rapid eye movement (REM)
Any short, quick movement of the eyes,
espe-cially that occurring during the rapid eye
movement phase of sleep
rapid eye movement sleep
That phase of sleep during which the eyeballs
can be observed to move rapidly and the EEG
resembles an awake, alert state Typically
thought to be involved with dreaming
rapid rail
A subway-type transit vehicle railway
oper-ated on exclusive private rights-of-way with
high-level platform stations Rapid rail also
may operate on elevated or at grade-level
track separated from other traffic See also
rail mode, rapid transit rail, transit mode,
transit railroad, and transit railway.
rapid transit
Rail or motorbus transit service operating
completely separate from all modes of
trans-portation on an exclusive right-of-way
rapid transit rail
Transit service using rail cars driven by
elec-tricity usually drawn from a third rail,
config-ured for passenger traffic and usually operated
on exclusive rights-of-way It generally uses
longer trains and has longer station spacing
than light rail See also rail mode, rapid rail,
transit mode, transit railroad, and transit
railway.
rapids
An area of broken, fast flowing water in a
stream, where the slope of the bed increases
(but without a prominent break of slope which
might result in a waterfall), or where a gently
dipping bar of harder rock outcrops
rapture of the deep/depths
See nitrogen narcosis.
rarefaction
The momentary reduction in pressure during
the trough in a sound wave
rasp
A machine that grinds waste into a
manage-able material and helps prevent odor
raster display
A video- or CRT-type display in which the
screen is written in a standard,
prepro-grammed sequence
ratbite fever
Either of two distinct diseases (Haverhill ver and sodoku) that may be transmitted toman by the bite of an infected rat and, lesscommonly, by the bite of an infected squirrel,weasel, dog, cat, or pig
fe-RATCF
See radar air traffic control facility.
ratchet
Marine Operations A heavy turnbuckle with
cork-screw threads and midships handle,equipped with pelican hooks on both ends forthe purpose of rapidly tightening up wirelashings holding the barges of a tow together
It is widely used on the rivers
rate
(1) The frequency at which a certain event orcircumstance occurs within a specified orcommonly understood time period (2) Thequantity of output produced, expressed as ei-ther per unit time or percent of capac-ity/normal (3) See speed (4) See wage rate
and piece rate (5) To judge the relative orabsolute amount of some quality of an entity
or process, using some scale or other basis
rate change
(1) Any alteration in a production time or put standard (2) Any alteration in workercompensation, whether time based or outputbased
out-rate control
The ability to adjust a controlling device as afunction of changes in the velocity of a con-tinuously moving object or pattern Also re-
ferred to as first-order control and velocity control.
rate cutting
An arbitrary reduction in the incentive payrate or scale
rate of decay
Acoustics The time rate at which the sound
pressure level decreases at a given point and
at a given time after the source is turned off
Trang 18rate-regulated pipelines
The pipelines included in these segments are
all federally or state rate-regulated pipeline
operations, which are included in the
report-ing company's consolidated financial
state-ments However, at the reporting company's
option, intrastate pipeline operations may be
included in the U.S Refining/Marketing
Segment if a) they would comprise less than
5 percent of U.S Refining/Marketing
Seg-ment net property plant & equipSeg-ment (PP&E),
revenues, and earnings in the aggregate; and
b) if the inclusion of such pipelines in the
consolidated financial statements adds less
than $100 million to the net PP&E reported
for the U.S Refining/Marketing Segment
rate setting
The establishment of standard time values or
any monetary pay scale for a given operation,
based on a rate determination
rated activity sampling
A more detailed activity sampling in which a
rating is determined for each work element to
establish the work content in addition to that
time occupied by delays and other activities
rated average element time
See normal element time.
rated load
The maximum static load or force that can be
imposed on the part or structure at any time
during its intended operation and expected
environment
rated maximum continuous augmented thrust
With respect to turbojet engine type
certifica-tion, means the approved jet thrust that is
de-veloped statically or in flight, in standard
at-mosphere at a specified altitude, with fluid
injection or with the burning of fuel in a
sepa-rate combustion chamber, within the engine
operating limitations established under Part
33 of the Federal Aviation Regulations, and
approved for unrestricted periods of use
rated maximum continuous thrust
With respect to turbojet engine type
certifica-tion, means the approved jet thrust that is
de-veloped statically or in flight, in standard
at-mosphere at a specified altitude, without fluid
injection and without the burning of fuel in a
separate combustion chamber, within the
en-gine operating limitations established under
Part 33 of the Federal Aviation Regulations,and approved for unrestricted periods of use
rated takeoff augmented thrust
With respect to turbojet engine type tion, means the approved jet thrust that is de-veloped statically under standard sea levelconditions, with fluid injection or with theburning of fuel in a separate combustionchamber, within the engine operating limita-tions established under Part 33 of FederalAviation Regulations, and limited in use toperiods of not over 5 minutes for takeoff op-eration
certifica-rated takeoff thrust
With respect to turbojet engine type tion, means the approved jet thrust that is de-veloped statically under standard sea levelconditions, without fluid injection and withoutthe burning of fuel in a separate combustionchamber within the engine operating limita-tions established under Part 33 of the FederalAviation Regulations, and limited in use toperiods of not over 5 minutes for takeoff op-eration
certifica-rating
(1) A statement that, as a part of a certificate,sets forth special conditions, privileges, orlimitations (2) That class or level at which anoperator is qualified (3) That assessment of aworker's pace or output relative to the stan-dard pace or output
rating factor
That level of skill and effort displayed by anoperator during the period of study, based on100% as normal skill and effort
rating of perceived effort (RPE)
An individual's estimate of how hard a task is,
in terms of very, very light to very, very hard
Also known as rate of perceived exertion, rated perceived exertion, and rating of per-
ceived exertion See also rating of perceived
exertion scale.
rating of perceived effort scale
A 15-point scale ranging from 6 to 20 which
is used by an individual to report the amount
of effort/exertion he/she is putting forth Also
referred to as the Borg scale and perceived
exertion scale See also rating of perceived effort.
Trang 19rating scale
Any rank ordering scale for recording worker
performance
ratio
A mathematical relationship between two
numerical variables or values in which they
are expressed as a fraction (as A/B) and may
be evaluated as a quotient
ratio-delay study
A study in which a large number of
instanta-neous work samples are taken randomly
ratio estimate
The ratio of two population aggregates
(to-tals) For example, "average miles traveled
per vehicle" is the ratio of total miles driven
by all vehicles, over the total number of
vehi-cles See also estimate ratio and mean.
ratio scale
A basic measurement scale meeting the
crite-ria of an equal-interval scale and in which a
known valid zero exists such that the ratio of
numerical measures can be interpreted as a
ratio of their magnitudes
rational basis test
Under this test, an appellate court will not
second-guess the legislature as to the wisdom
or rationality of a particular statute if there is a
rational basis for enactment, and if the
chal-lenged law bears a reasonable relationship to
the attainment of some legitimate
govern-mental objective
rationalization
A defense mechanism in which a person finds
logical reasons (justification) for his/her
be-havior while ignoring the real reasons It is a
form of self-deception and is unconsciously
employed to make tolerable certain feelings,
behaviors, and motives that would otherwise
be intolerable Everyone employs
rationali-zation at some time or other and in most
in-stances it is a relatively harmless behavior
pattern The danger lies in deceiving oneself
habitually so that eventually harmful or
de-structive behavior can be justified in one's
mind Also, when investigating an accident
or incident, witnesses may tend to rationalize
as time passes Therefore, the earlier a
wit-ness interview can take place following an
ac-cident event, the better the chance of
obtain-ing more usable testimony
rattening
An offense on the part of the members of atrade union involving the taking away and/orhiding of the tools, clothes, or other property
of a worker in an attempt to compel him/her
to join the union or cease working In land, it is an offense punishable by fine or im-prisonment
raw agricultural commodity
According to the Federal Food, Drug, andCosmetic Act: Any food in its raw or naturalstate, including all fruits that are washed, col-ored, or otherwise treated in their unpeelednatural form prior to marketing
raw material
An unprocessed material or material whichhas undergone some preliminary processingelsewhere which is used as input to a proc-essing operation
deter-Raynaud's syndrome
A vascular disorder resulting in the tion of the blood vessels of the hands due tocold temperature, emotions, vibration, or un-known cause The hands become a bluish-white color due to lack of blood circulationand become painful upon exposure to cold It
constric-is associated with the operation of hand-held
or manually supported or guided machines
Trang 20that produce intense vibration in the
fre-quency range of 10 to 1000 Hz Symptoms
include pain in the fingers, loss of manual
dexterity, stiffness in the joints,
radiographi-cally observable changes in the bones and
joints, whitening and numbness in one or
more fingers of either hand, skin atrophy, and
occasionally gangrene Also referred to as
Raynaud's disease, dead hands, and vibration
RCRA Hazardous Waste Data Management
System; includes selective information on
over 324,000 sites which generate, transport,
store, treat, and/or dispose of hazardous waste
as defined by RCRA Records available in
HWDMS will eventually be transferred to the
of flexion, extension, or other joint ments to attain a point in space for some op-eration (4) A certain area of a river, usually astraight section
move-reach envelope
The volume or solid bounded proximally bythe body, clothing surface, or proximal reachand by the distal boundary in any directionwhich an individual or robotic device can at-tain by any combination or postures, rotations,flexion, and/or extension movements underspecified conditions
reach from wall, maximum
The distance from a wall to the tip of the dle finger Measured with the individual'sback and the contralateral shoulder pressedagainst the wall, the shoulder of the arm beingmeasured held as far forward as possible, withthe arm and hand extended horizontally
mid-reaction time
The time required for a person to react to astimulus
reaction time delay
A time factor used in the modeling of machine systems to simulate the human reac-tion to an event
man-reactionless tool
Any tool which compensates internally forforces or torques induced as a result of its ac-tions such that there is essentially no externalforce or torque applied to the user
reactive
Materials which by themselves or in contactwith water or other non-compatible materialsare readily capable of detonation, explosivedecomposition or explosive reaction at normaltemperatures and pressures, as well as thosematerials that are sensitive to mechanical orlocalized shock at normal temperatures andpressures
reactive muffler
Acoustics A type of muffler used to reduce
noise emissions from an engine, such as thatfrom an automobile exhaust system
Trang 21A measure of the tendency to undergo a
chemical change or reaction with the release
of energy It is the susceptibility of materials
to release energy
read-out
A meter reading or other form for displaying
visual information to an individual See also
call-out.
read the water
To navigate by visual observation of the water
surface; not recommended for newcomers
readability
A quality of text or numbers which allows
groups of related alphanumeric characters to
be easily discerned and recognized as words
or number sequences
readily accessible
Capable of being reached quickly for
opera-tion, renewal, or inspections, without
requir-ing those to whom ready access is required to
climb over or remove obstacles or to resort to
portable ladders, chairs, etc See also
acces-sible.
readiness potential
A change in cortical potential in the motor
cortex just prior to a planned, volitional
movement
readiness time
That period of time necessary for a system to
be prepared from a specified, inactive state to
a state in which it is stabilized and can
per-form its intended function
reading point
See breakpoint.
reading radius
The distance from the front of the eyeball to
the object or display to be read
reading speed
The number of words of text read per minute
by an individual
reagent
A substance that produces a chemical reaction
that can be used to detect, measure, or
pro-duce another substance
reagent blank
Materials used in sample analysis are
evalu-ated as reagent blanks to determine their
con-tribution, if any, to the analytical result
real ear attenuation at threshold (REAT)
A methodology for determining the tion provided by a hearing protection devicefitted in a prescribed manner on a group ofnormal wearers
attenua-real-ear protection at threshold
The mean value in decibels of the occludedthreshold of audibility (hearing protector inplace) minus the open threshold of audibility(ears open and uncovered) for all listeners onall trials under otherwise identical test condi-tions
real time
(1) General Having essentially no
percepti-ble delay between the occurrence of an eventand the knowledge of the event at another lo-cation Also, having a control system whichdelivers the necessary inputs to the systembeing controlled at or prior to the times they
are required (2) Instrumentation An
in-strument that responds to and indicates acontaminant concentration or level of a physi-cal agent as changes are occurring
realistic job preview (RJP)
A pre-employment description or employee orientation in which accurate andprecise information about the job is related tothe individual
new-realizable
Pertaining to a component or system which isphysically manufactured, not merely theoreti-cal
ex-rear axle capacity
The factor and/or Society of Automotive gineers (SAE) recommended maximum loadthat a rear axle assembly is designed to carry
En-as rated at the ground and expressed inpounds
rear end collision
(1) A collision in which one vehicle collideswith the rear of another vehicle (2) A colli-sion in which the trains or locomotives in-volved are traveling in the same direction onthe same track (3) A collision of the front of
Trang 22one vehicle with the rear of another vehicle.
Also called rear-end.
rear extremity
Transit The rearmost point on a vehicle
when the vehicle's cargo doors, tailgate, or
other permanent structure are positioned as
they normally are when the vehicle is being
driven Non-structural protrusions such as tail
lights, hinges, and latches are deleted from the
determination of the rearmost point
rear overhang
Transit The distance from the center of the
rear axle to the end of the frame
rear projection
Pertaining to a display which is presented to
one side of a translucent screen for viewing
from the other side
rearrange tow
Maritime To shift barges in tow.
reasonable accommodation
Under the Americans with Disabilities Act
(ADA), that modification to the workplace or
other environment which enables a qualified
handicapped individual to work in a given
situation and does not impose an undue
hard-ship on an employer
reasonable act
Such as may fairly, justly, and reasonably be
required of a party
reasonable and probable cause
Such grounds as to justify anyone suspecting
another person of a crime, and placing him or
her in custody based on those grounds It is a
suspicion founded upon circumstances
suffi-ciently strong to cause a reasonable person to
believe that a charge is true
reasonable care
Law Such a degree of care, precaution, or
diligence as may fairly and properly be
ex-pected or required, having regard to the nature
of the action, or of the subject matter, and the
circumstances surrounding the transaction It
is such care as an ordinary prudent person
would exercise under the conditions existing
at the time he/she is called upon to act
Sub-stantially synonymous with ordinary care or
due care It should be noted that a "high
de-gree of care" is not the legal equivalent of
rea-sonable care It is that degree of care which a
very cautious, careful, and prudent person
would exercise under the same or similar cumstances; a degree of care commensurate
cir-with the risk of danger See also ordinary care.
reasonable cause
A basis for arrest without warrant exists whenthe facts would lead a person of ordinary careand prudence to believe and conscientiouslyentertain an honest and strong suspicion thatthe person subject to the arrest is guilty of
committing a crime See also reasonable and
probable cause.
reasonable compensation
The sum which would reasonably compensate
a person for injuries, for pain and suffering,and for past, present, and future expenses rea-sonably necessary or incidental to his/her ef-forts to alleviate injuries and all pecuniarylosses suffered, or to be suffered, as a result of
an inability to engage in his/her usual pation
occu-reasonable diligence
OSHA’s expectation that an employer is able for conditions or practices which shouldreasonably have been known of and/or takingpreventive actions OSHA believes employ-ers have an affirmative duty to monitor itsworkplace safety and become knowledgeable
li-of all hazards that may be present there
to themselves It is doubt based on reasonwhich arises from evidence or lack of evi-dence
reasonable force
That degree of force which is not excessiveand is appropriate in protecting oneself and/orone's property When such force is used, a
Trang 23person is justified and is not criminally liable,
nor is he/she liable in tort
reasonable grounds
Reasonable grounds within a statute
author-izing an arrest without a warrant by an officer
who has reasonable grounds for believing that
a person to be arrested has committed a
criminal offense means substantially probable
cause.
reasonable man doctrine
The standard which one must observe to
avoid liability for negligence is the standard
of the reasonable man under all
circum-stances, including the foreseeability of harm
to another person (such as a plaintiff)
reasonably available control technology (RACT)
The lowest emissions limit that a particular
source is capable of meeting by the
applica-tion of control technology that is both
rea-sonably available, as well as technologically
and economically feasible RACT is usually
applied to existing sources in nonattainment
areas and in most cases is less stringent than
new source performance standards
REAT
See real ear attenuation at threshold.
reboot
Computing The act of restarting a computer
by reloading the operating system You can
reboot some computers by pressing the RESET
button On all personal computers, the user
can reboot or "warm boot" by pressing the
CTRL+ALT+DEL keys on the keyboard (press
all keys at the same time)
rebuild
A complete repair of a component with the
objective of returning it as nearly as possible
to its original and/or performance
characteris-tics
rebuilt caboose
A caboose that has undergone overhaul which
has been identified by the railroad as a capital
expense under Interstate Commerce
Commis-sion accounting standards
rebuilt locomotive
A locomotive that has undergone overhaul
which has been identified by the railroad as a
capital expense under Interstate Commerce
Commission accounting standards
rebuilt passenger car
A passenger car that has undergone overhaulwhich has been identified by the railroad as acapital expense under Interstate CommerceCommission accounting standards
rebuttable presumption against registration (RPAR)
See special review.
recall
(1) A statement by a manufacturer or tributor of some item that it may have one ormore defects and should be returned for re-placement or repair (2) To access informa-tion stored in memory and output that infor-mation
dis-receiver
A device on a locomotive, so placed that it is
in position to be influenced inductively oractuated by an automatic train stop, train con-trol, or cab signal roadway element
receiver coil
Concentric layers of insulated wire woundaround the core of a receiver of an automatictrain stop, train control, or cab signal device
on a locomotive
receiver operating characteristic (ROC)
A graphical presentation of detector ance in signal detection theory, including thecombined effects of sensitivity and response
perform-bias on operator performance See also signal detection theory.
receiving
That organization or those activities involved
in the receipt and distribution within the plant
of raw materials, equipment, and suppliesfrom external sources
receiving waters
A river, lake, ocean, stream, or other course into which wastewater or treated efflu-ent is discharged
water-recency error
An error due to recent events which bias a
rating or other measure Also called recency
of events error.
receptacle
(1) General, Electrical A contact device
in-stalled at the outlet for the connection of a
single attachment plug (2) Single Receptacle.
A single contact device with no other contact
Trang 24device on the same yoke (3) Multiple
Re-ceptacle A single device containing two or
more receptacles (4) Transit – Freight A
containment vessel for receiving and holding
materials, including any means of closing
receptacle outlet
An outlet where one or more receptacles are
installed
reception minimum altitude
The lowest altitude at which an intersection
can be determined
receptive field
A region of the skin, retina, or other structure
having an extended sensory apparatus within
which appropriate stimulation affects the
re-sponse of a given sensory neuron
receptor
Binding site that has a high affinity for a
par-ticular ligand Receptors interact with
bio-logically endogenous ligands, facilitating
in-tracellular communication Many chemicals
interact with receptors, producing a variety of
toxic effects
recessed
Pertaining to any device or object which is
embedded, either entirely or in part, within
another structure such that the device or
ob-ject is still visible
recharge
The process by which water is added to a zone
of saturation, usually by percolation from the
soil surface, e.g., the recharge of an aquifer
recharge area
A land area in which water reaches to the
zone of saturation from surface infiltration,
e.g., an area where rainwater soaks through
the earth to reach an aquifer
reciprocal color temperature
A chromaticity measure which more nearly
provides equal perceptible divisions of color
temperature
reciprocating pedal
A foot-operated device which operates as a
member of a pair of pedals by moving in
op-posing directions about a common shaft with
a rotational capability limited by the pedal
ra-dial motion
reckless endangerment
A statutory offense committed by creating asubstantial risk of death or serious injury toanother
reckless homicide
A species of statutory homicide in some statescharacterized by a willful and wanton disre-gard of consequences and resulting in death
In some states, it may amount to ter
reclamation
The restoration of land, water, or waste rials to usefulness through methods such assanitary landfill, wastewater treatment, ormaterial recovery
mate-Reclamation Act
The Reclamation Act of 1902 authorized theSecretary of the Interior to locate, construct,operate, and maintain works for the storage,diversion, and development of waters for thereclamation of arid and semiarid lands in theWestern States
reclining
Pertaining to a posture involving an diate position between sitting and lying inwhich the posterior aspect of the body isagainst some reference surface, with the torsoapproximately between 45° and horizontal,and some degree of flexion of the hips andknees
interme-recognition
The process in which an observer interprets orcomputer process matches with data in mem-ory the information available from a stimulus
or object to arrive at a conclusion about thestimulus or object
Trang 25concept of "recognized hazard" is a critical
element in the OSHA compliance process,
es-pecially with regard to the employer's General
Duty under Section 5(a)(1) of the OSHAct
The contention is that a hazard must first be
"recognized" as such before any attempts can
be made to remove or control it However, it
must be clearly understood that ignorance of a
hazard or hazardous condition does not
ele-vate the responsibility to eliminate or control
it OSHA has clearly established a position
that places this burden of knowledge directly
on the employer If the employer should have
known or, with the practice of reasonable
diligence, could have known about the hazard,
then the employer is still required to and
obli-gated to control or remove the hazard See
also General Duty Clause.
recombinant bacterium
A type of microorganism whose genetic
makeup has been deliberately altered by
in-troduction of new genetic elements
recombinant DNA (rDNA)
The new DNA that is formed by combining
pieces of DNA from different organisms or
cells
recommended daily allowance (RDA)
That amount of a specified mineral, vitamin, or
other substance which is recommended for
normal health
recommended exposure limit (REL)
An occupational exposure limit recommended
by NIOSH as being protective of worker
health over a working lifetime
recommended maximum contaminant level
(RMCL)
The maximum level of a contaminant in
drinking water at which no known or
antici-pated adverse affect on human health would
occur, and which includes an adequate margin
of safety Recommended levels are
non-enforceable health goals See maximum
con-taminant level
recompression therapy
The treatment for decompression sickness
using a hyperbaric chamber to increase the
ambient pressure
reconciling items
Items where accounting practices vary for
handling these expenses as a result of local
ordinances and conditions Reconciling itemsinclude depreciation and amortization, interestpayments, leases and rentals They are calledreconciling items because they are needed toprovide an overall total that is consistent withlocal published reports
reconstructed source
An existing facility in which components arereplaced to such an extent that the fixed capi-tal cost of the new components exceeds 50percent of the capital cost that would be re-quired to construct a comparable entirely newfacility New source performance standardsmay be applied to sources which are recon-structed after the proposal of the standard if it
is technologically and economically feasible
to meet the standard
record of decision (ROD)
A public document that explains whichcleanup alternative(s) will be used at NationalPriorities List sites where, under CERCLA,Trust Funds pay for the cleanup
recordable occupational injuries and illnesses
Under OSHA 29 CFR 1904.12(c), any pational injuries or illnesses which result in:a) fatalities, regardless of the time be-tween the injury and death, or thelength of the illness; or
occu-b) lost workday cases, other than fatalities,that result in lost workdays; or
c) nonfatal cases without lost workdayswhich result in transfer to another job
or termination of employment, or quire medical treatment (other than firstaid) or involve loss of consciousness orrestriction of work or motion Thiscategory also includes any diagnosedoccupational illnesses which are re-ported to the employer but are not clas-sified as fatalities or lost workdaycases
re-recording thermometer
A thermometer with a recording device used
to obtain a permanent record of temperature
records retention policy
A systematic procedure for the retention anddestruction of an organization’s documents.Retention periods may be driven by businessconsiderations and not requirements of law.Failure to retain documents in the face of dis-covery in litigation can result in evidentiary
Trang 26implications as well as creating a risk of
criminal penalties The policy is also part of
the compliance program as government
in-vestigators will also check an organization’s
records to determine compliance with
regula-tory document retention requirements Also
referred to as document retention policy.
recoverable light loss factor
Any light loss factor due to conditions which
can be remedied through activities such as
maintenance, normal servicing, or cleaning,
specifically including lamp burnout, lumen
depreciation, luminaire dirt depreciation, and
room surface dirt depreciation
recoverable resources
Materials that still have useful physical,
chemical, or biological properties after
serv-ing their original purpose and can, therefore,
be reused or recycled for the same or other
purposes
recoverable solid waste
Under the Federal Solid Waste Disposal Act:
The capability and likelihood of being
recov-ered from solid waste for a commercial or
in-dustrial use
recovered resources
Under the Federal Solid Waste Disposal Act:
Material or energy recovered from solid
waste
recovered solid waste material
Under the Federal Solid Waste Disposal Act:
Waste material and byproducts which have
been recovered or diverted from solid waste
recovery efficiency
The ratio, expressed as a percentage, of the
amount of a material recovered from a
sam-pling media to the amount placed on/in the
media
recreational boat
(1) Any vessel manufactured or used
primar-ily for noncommercial use; leased, rented or
chartered to another for the latter's
noncom-mercial use (2) Any vessel engaged in the
carrying of six or fewer passengers
recruit
To search for possible new employees
rectangular coordinate system
A dimensional coordinate system composed
of n perpendicular axes, where n is any
posi-tive integer value Also referred to as sian coordinate system.
A segment of the large intestine just proximal
to the anal canal
rectus abdominis muscle
A voluntary skeletal muscle which has a cal extent and is located over the abdomenjust lateral to the midline of the body
pos-recumbent length
The length of the body from the top of thehead to the bottom of the heels Measuredwith the individual lying on a flat, hard sur-face (e.g., a recumbent-length table), the headpositioned such that the line of sight is verti-cal, the hips and knees fully extended, and thelongitudinal axis of the feet vertical
recumbent-length table
A hard, flat surface, which is wider than theshoulders, and which has a fixed headboardand a sliding/removable baseboard for meas-uring lengths while the subject is lying down
recycle/reuse
The process of minimizing the generation ofwaste by recovering usable products thatmight otherwise become waste
recycled air
That portion of the atmospheric gases retained
in a ventilation system for recirculation
recycled material
A material that is utilized in place of a mary, raw, or virgin material in manufactur-ing a product They consist of consumer
Trang 27pri-waste, industrial scrap, materials from
agri-cultural product waste, and others
recycled oil
Under the Federal Solid Waste Disposal Act:
Any used oil which is reused, following its
original use, for any purpose (including the
purpose for which the oil was originally
used) Such term includes oil which is
re-fined, reclaimed, burned, or reprocessed
recycling
The reuse of materials ordinarily considered
waste, whether hazardous or nonhazardous
red
A primary color, corresponding to that hue
apparent to the normal eye when stimulated
with electromagnetic radiation approximately
An EPA document that is undergoing final
review before being submitted for final
man-agement decision
red marrow
That type of marrow which produces certain
types of blood cells, including erythrocytes
red muscle
A skeletal muscle which appears in the fresh
or living state, probably due to muscle
hemo-globin and cytochrome, and which has a
longer latency than white muscle
red-out
A condition in which vision appears blurred
by a red mist due to centripetal (negative g)
accelerations
red tide
A proliferation of a marine plankton that is
toxic and often fatal to fish This natural
phe-nomenon may be stimulated by the addition
of nutrients A tide can be called red, green or
brown, depending on the coloration of the
plankton
redirect examination
An examination of a witness by the direct
examiner subsequent to the cross-examination
of the witness
reduced comfort boundary
A set of limits representing the maximum posure time for whole-body vibration in dif-ferent frequency ranges
ex-reduction
Used to indicate the slower output speed sulting from a ratio proportion (faster on re-
re-ductions of less than 1) a) Single Reduction.
A single set of reducing gears in the rear axle
b) Double Reduction An additional gear-set
in the rear axle to reduce output speed further.May or may not be used as a 2-speed rearaxle
reef area
An area identified as a danger to maritimenavigation containing one or more chains ofrocks or coral, at or near the surface of thewater
reef pool
Pocket of sea/ocean completely surrounded by
a coral reef
reefer
Transit (slang) Refrigerated truck or trailer
designed for hauling perishables
reefing current
Current where the swift water reaches theslack water and creates boils or continuesboils or turbulent water It is considered theedge of the reef or what would be a reef wereone there
re-entrainment
A situation that occurs when the air beingexhausted from a building is immediatelybrought back into the system through the airintake and other openings in the building en-velope
reentry
A return to the work force or other aspect ofsociety following a period of absence
Trang 28reentry interval
The period of time immediately following the
application of a pesticide during which
un-protected workers should not enter a field
referee fluid
A compatible fluid, other than that used
dur-ing normal system operations, that is used for
test purposes because it is safer due to
char-acteristics such as less (or non-) explosive,
flammable, or toxic, and/or it is easier to
de-tect
reference dose (RfD)
Toxicity value used most often in evaluating
noncarcinogenic effects resulting from
expo-sures at Superfund sites See specific entries
for chronic RfDs, subchronic RfDs, and
A hypothetical aggregation of human physical
and physiological characteristics arrived at by
international consensus For example, the
weight, height, and other physical dimensions
are presented for what has been agreed to as
the reference man Also referred to as the
standard man.
referent power
The ability of management to gain support for
a project because personnel are personally
at-tracted to the manager or interested in the
project
referred pain
A pain which is felt at one location, but which
represents a disorder at another location
refined petroleum pipelines
Establishments primarily engaged in the
pipeline transportation of refined products of
petroleum, such as gasoline and fuel oil
refined petroleum products
Refined petroleum products include but are
not limited to gasoline, kerosene, distillates
(including No 2 fuel oil), liquefied petroleum
gas, asphalt, lubricating oils, diesel fuels, and
residual fuels
reflectance
A measure of the ratio of the luminance of a
surface to the illumination on the surface
of the wave incident on that surface or
bound-ary Also referred to as coefficient of tion.
reflec-reflective material
A material conforming to Federal tion L-S300, "Sheeting and Tape, Reflective;Non-exposed Lens, Adhesive Backing,"(September 7, 1965) meeting the performancestandard in either Table 1 or Table 1A of So-ciety of Automotive Engineers (SAE) Stan-dard J594f, "Reflex Reflectors" (January,
Specifica-1977) See also left bank, reflex reflector, retro-reflective material, and right bank.
by deflection of a nerve impulse that does notpenetrate the level of consciousness
recep-reflex reflector
A device which is used on a vehicle to give anindication to an approaching driver by re-flected light from the lamps on the approach-
ing vehicle See also reflective material.
Trang 29A chart recorder for displaying graphically the
magnitude of a musculoskeletal reflex
reflexometer
An instrument used to measure the force
re-quired to elicit a reflex
reflux esophagitis
A burning sensation in the thorax, generally
due to stomach acid refluxing through the
lower esophageal sphincter Commonly
re-ferred to as heartburn.
reformulated gasoline
(1) Gasoline whose composition has been
altered in order to reduce evaporation and
ex-haust emissions that contribute to ozone
for-mation (2) Motor gasoline, formulated for
use in motor vehicles, the composition and
properties of which are certified as
reformu-lated motor gasoline by the Environmental
Protection Agency
refract
Change the direction of an energy wave on
passing from one medium to another in which
the wave has a different velocity
refraction
(1) Illumination The bending of light as it
passes from one medium to another (2)
Acoustics The bending of a sound wave from
its original path due to its passing from one
medium to another, or due to a temperature or
wind gradient (3) Anatomy Determination
of the refractive errors of the eye and their
correction by glasses
refractory period
See cellular refractory period.
refrigerant
A substance that will absorb heat while
va-porizing and whose boiling point and other
properties make it useful as a medium for
Conversion of solid waste into useful
prod-ucts, e.g., composting organic wastes to make
soil conditioners or separating aluminum andother metals for melting and recycling
regeneration
Manipulation of individual cells or masses ofcells to cause them to develop into wholeplants
regional administrator
A person appointed by the Administrator ofthe EPA for one of its several geographic re-gions
regional distribution port
Waterfront area which a) is identifiable with
a Standard Metropolitan Statistical Area(SMSA) as defined by the U.S Bureau ofCensus, b) has 10 or more commercial termi-nal facilities located within a reasonable dis-tance of the general area, c) is served by atleast two Class I railroads, and d) is served by
at least five interstate or U.S highways
regional response team (RRT)
Representatives of federal, local, and stateagencies who may assist in coordination ofactivities at the request of the On-Scene Co-ordinator before and during a Superfund re-sponse action
register
A fixture through which air is returned to a
ventilation system Also referred to as a turn air register.
re-register breadth
Maritime The breadth of a vessel at its
wid-est part measured from the outer side of theplanking or plating on one side to the corre-sponding point on the opposite side
register depth
Maritime The depth of a vessel measured
from the underside of the tonnage deck, ship, to the bottom of the hold The depth isnot the draft of a vessel
amid-registered active general aviation aircraft
A civil aircraft registered with the FAA thathas been flown one or more hours during theprevious calendar year Excluded are aircraftowned and operated in regularly scheduled,non-scheduled, or charter service by commer-cial air carriers and aircraft in excess of12,500 pounds maximum gross takeoffweight, and owned and operated by a com-mercial operator certificated by the FAA toengage in intrastate common carriage
Trang 30registered aircraft
Aircraft registered with the Federal Aviation
Administration
registered inspector
A person registered with the Department [of
Transportation (DOT)] in accordance with 49
CFR 107 Subpart F who has the knowledge
and ability to determine if a cargo tank
con-forms with the applicable DOT specification
and has, at a minimum, any of the
combina-tions of education and work experience in
cargo tank design, construction, inspection, or
repair set out in 49 CFR 171.8
registrant
Any manufacturer or formulator who obtains
registration for a pesticide active ingredient or
product
registration
Formal listing with EPA of a new pesticide
before it can be sold or distributed in intra- or
interstate commerce The product must be
registered under the Federal Insecticide,
Fun-gicide, and Rodenticide Act EPA is
responsi-ble for registration (pre-market licensing) of
pesticides on the basis of data demonstrating
that they will not cause unreasonable adverse
effects on human health or the environment
when used according to approved label
direc-tions
registration standards
Published reviews of all the data available on
pesticide active ingredients
Registry of Toxic Effects of Chemical
Sub-stances (RTECS)
A five-volume NIOSH compilation listing the
toxicity data of over 80,000 compounds
regression
(1) General Return to an earlier or primitive
state (2) Statistics A statistical procedure
which is employed to establish a relationship
between two variables to enable the prediction
of the values of one variable, Y (dependent
variable), to those which correspond to given
values of the other variable, X (independent
variable) (3) Medicine Subsidence of
symptoms or of a disease process (4)
Biol-ogy The tendency in successive generations
toward mediocrity (5) Psychology A mental
mechanism utilized to resolve conflict or
frustration by returning to a behavior that was
successful in earlier years
regression equation
An equation in which the value of a criterionvariable may be predicted from one or moreknown predictor variable values
regression line
A graphic line or a linear equation ing a linear or approximately linear functionwhich may be used for predicting the value ofone variable from a set of known values
represent-regression model
The use of regression techniques to explainprojections
regular course of business
Worker's Compensation The habitual or
regular occupation that a party is engaged in,with the intent of winning livelihood or somegain, excluding incidental or occasional op-erations arising out of the transaction of thebusiness
regular element
A job element which is performed at leastonce in each work cycle or operation
regular grade gasoline
A grade of unleaded gasoline with a loweroctane rating (approximately 87) than othergrades Octane boosters are added to gasoline
to control engine preignition or "knocking" by
slowing combustion rates See also gasoline.
regular leaded gasoline
Gasoline having an antiknock index (R+M/2)greater than or equal to 87 and less than orequal to 90 and containing more than 0.05grams of lead or 0.005 grams of phosphorus
per gallon See also gasoline.
regular sampling
The continuous or intermittent (at a relativelyfixed frequency) taking of a representativeportion of the material being sampled
regular unleaded gasoline
Gasoline having an antiknock index (R+M/2)greater than or equal to 85 and less than 88,
Trang 31and containing not more than 0.05 grams of
lead or 0.005 grams of phosphorus per gallon
See also gasoline.
regularly employed driver
A driver who, in any period of 7 consecutive
days, is employed or used as a driver solely
by a single motor carrier
regulated area
Under many OSHA criteria, an area where
exposure to a regulated airborne contaminant
or physical stress agent is, or can be expected
to be in excess of an OSHA permissible
expo-sure limit
regulated motor carrier
A carrier subject to economic regulation by
the Interstate Commerce Commission
regulation
(1) A rule of general application and future
effect promulgated by an agency with
juris-diction Distinguished from a legislation
which is a statute or act of a legislature made
up of elected representatives of the public
Federal regulations are codified in the Code of
Federal Regulations (CFR) (2) Any agency
statement of general or particular applicability
designed to implement, interpret, or prescribe
policy in order to carry out the purpose of a
law Synonymous with rule, it has the force
of law
regurgitation
Abnormal backward progression of fluids or
other vessel contents, as the return of
undi-gested food from the stomach to the oral
cav-ity, or of blood through valves of the heart
rehabilitate
Use one or more forms of treatment in an
at-tempt to restore some or all loss of capacity or
develop residual capabilities to give an
indi-vidual a maximal state of independence
rehabilitation
The process of restoring a person's ability to
live and work as normally as possible after a
disabling injury or illness It aims to help the
patient achieve maximum possible physical
and psychologic fitness and regain the ability
to care for himself/herself It offers assistance
with the learning or relearning of skills
needed in everyday activities, with
occupa-tional training and guidance and with
psy-chologic readjustment Rehabilitation is anintegral part of convalescence
rehearsal
The process of recycling information inworking memory to maintain it within work-ing memory or to store it in long-term mem-ory
rehydration
The restoration of water or fluid content to abody or to a substance that has become dehy-drated
Reid vapor pressure (RVP)
The vapor pressure of a liquid at 200ºF, asdetermined by a standard laboratory proce-dure (ASTM Test D-23) and expressed inpounds per square inch absolute
Reid's base line
An imaginary line defined by the location ofthe auricular point and the lowest point of theorbit on the same side of the head, with ananterior-posterior extent
weakening, respectively, of that response See
positive reinforcement and negative forcement.
reject allowance
A special time allowance provided a workerfor processing rejects from a process or forrework
reject staging
Reverse osmosis process configuration wherethe overflow water from one stage is used asfeed water on subsequent stage to increase
water recovery Also called brine staging.
rejection
The immune reaction of the recipient to eign tissue cells (antigens) after homografttransplantation, with the production of anti-
Trang 32for-bodies and ultimate destruction of the
trans-planted organ
REL
See recommended exposure limit.
relapsing fever
Any one of a group of similar infectious
dis-eases transmitted to man by the bites of lice
and ticks, and marked by alternating periods
of normal temperature and periods of fever
relapse The diseases in the group are caused
by several different species of spirochetes
belonging to the genus Borrelia Generally,
relapsing fever starts with a sudden high fever
of 104 to 105ºF, accompanied by chills,
head-ache, muscle aches, nausea, and vomiting
There may also be jaundice and a rash The
attack lasts 2 or 3 days, after which the
symptoms disappear by crisis, with profuse
sweating accompanying the rapid drop in
temperature In elderly people, this may be
accompanied by collapse, in which the heart
and respiratory system function poorly After
3 or 4 days, there is a relapse and the
symp-toms return to their former severity The
cy-cle continues through four or more attacks
be-fore the disease has run its course Relapsing
fevers are rarely fatal, but they can be serious
relationship
An interdependence between individuals,
ac-tivities, or entities
relationship chart
A table which details what the response for
carrying out some task should be for several
possible situations
relationship diagramming
The process of examining various plant
lay-outs with the intent to optimize according to
the closeness of relationships within an
orga-nization
relative biological effectiveness (RBE)
The ratio of the number of rads of gamma
radiation or x-radiation of a certain energy
that will produce a specified biological effect
to the number of rads of another radiation
re-quired to produce the same effect Typically,
com-of 100% is about 2.5% total water vapor inair, by volume
move-relative standard deviation
See coefficient of variation.
A reach which can be attained without having
to strain or requiring maximal flexion and/orextension of limbs
relayed cut-section
Rail Operations A cut-section where the
energy for one track circuit is suppliedthrough front contacts or through front andpolar contacts of the track relay for the ad-joining track circuit
relearning time
The time required for a previous user to achieve a previous level of competence fol-lowing a period of non-use of skill or training
re-release
(1) General To let go; to no longer hold or
contend a claim of ownership over a
particu-lar thing (2) CERCLA Any spilling,
leak-ing, pumpleak-ing, pourleak-ing, emittleak-ing, emptyleak-ing,discharging, injecting, escaping, leaching,dumping, or disposing of hazardous sub-stances into the environment SARA included
in this definition the abandonment or carding of barrels, containers, and otherclosed receptacles containing any hazardous
Trang 33dis-substances or pollutant contaminant It
ex-cludes any release which results in exposure
to persons solely within a workplace, with
re-spect to a claim which such persons may
as-sert against the employer of such persons;
emissions from the engine exhaust of a motor
vehicle, rolling stock, aircraft, vessel, or
pipe-line pumping station engine; or release of
source, byproduct, or special nuclear material
from a nuclear incident as those terms are
de-fined in the Atomic Energy Act of 1954 if
such release is subject to requirements with
respect to financial protection established by
the Nuclear Regulatory Commission
release load
A work element in which an object is
re-leased
release rate
Under the Federal Organotin Antifouling
Paint Control Act of 1988: The rate at which
organotin is released from an antifouling paint
over the long term, as determined by the EPA
Administrator using a) the American Society
for Testing Materials (ASTM) standard test
method which the EPA required in its July 29,
1986, data call-in notice on tributyltin
com-pounds used in antifouling paints; or b) any
similar test method specified by the
Adminis-trator
relevance tree
A means of organizing and presenting
inter-related variables or problems in graphic form
for better visualization through the use of
nodes and branches
relevant evidence
Evidence tending to prove or disprove an
al-leged fact
reliability
(1) General An expression of the level of
confidence that a given system or product will
function, and continue to function, as intended
throughout the life cycle (2) Instrumentation.
The ability of an instrument and its
compo-nents to retain their operating performance
characteristics over a reasonable period of
use A statistical term having to do with the
probability that an instrument's repeatability
and accuracy will continue to fall within
specified limits This is a very important
characteristic for instruments which are to be
used in field applications
reliability coefficient
The correlation coefficient between two
suc-cessive performance samples Also called efficient or reliability.
relocated threshold
Aviation A threshold located at a point on
the runway other than the beginning of therunway pavement The portion of pavementbehind a relocated threshold that is not avail-able for takeoff
remedial action (RA)
(1) The actual construction or implementationphase of a Superfund site cleanup that followsremedial design (2) Those actions consistentwith permanent remedy taken instead of or inaddition to removal actions in the event of arelease or threatened release of a hazardoussubstance into the environment, to prevent orminimize the release of hazardous substances
so that they do not migrate to cause tial danger to present or future public health
substan-or welfare substan-or to the environment (3) The tual construction or implementation phase of aSuperfund site cleanup that follows remedialdesign
Trang 34ac-remedial design (RD)
A phase of environmental remedial action that
follows the remedial investigation/feasibility
study (RI/FS) and includes development of
engineering drawings and specifications for
site cleanup
remedial investigation (RI)
An in-depth study designed to gather the data
necessary to determine the nature and extent
of contamination at a Superfund site; establish
criteria for cleaning up the site; identify
pre-liminary alternatives for remedial actions; and
support the technical and cost analyses of the
alternatives The remedial investigation is
usually performed in tandem with the
feasi-bility study, hence the acronym "RI/FS." See
also feasibility study.
remedial maintenance
See corrective maintenance.
remedial project manager (RPM)
The EPA or state official responsible for
over-seeing remedial action at a site
remedial response
A long-term action that stops or substantially
reduces a release or threat of a release of
haz-ardous substances that is serious but not an
immediate threat to public health
remnant
(1) That portion of raw material, part, or
com-ponent remaining after some process (2)
That portion of an actual system output which
is unaccounted for or unexplained by the
sys-tem model Usually refers to linear models
remote
In terms of probability of hazard or mishap
occurrence, a hazard or event whose
occur-rence during the life of an item is considered
unlikely, but still possible
remote areas
Sparsely populated areas such as mountains,
swamps, and large bodies of water
remote cause
In the law of negligence with respect to an
injury or an accident, a cause which would
not, according to experience of mankind, lead
to the event which happened One where the
effect is uncertain, vague, or indeterminate,
and where the effect does not necessarily
fol-low
remote communications outlet (RCO)
Aviation Unmanned communications facility
remotely controlled by air traffic personnel
remote indicator
An instrument or display for showing tions at a point some distance away from thesensing device
removal costs
Under the Federal Oil Pollution Act of 1990:The costs of removal that are incurred after adischarge of oil has occurred or, in any case inwhich there is a substantial threat of a dis-charge of oil, the costs to prevent, minimize,
or mitigate oil pollution from such an dent
inci-remove
(1) Under CERCLA: The cleanup or removal
of released hazardous substances from the vironment, such actions as may be necessary
en-to take in the event of the threat of release ofhazardous substances into the environment,such as actions as may be necessary to moni-
Trang 35tor, assess, and evaluate the release or threat
of release of hazardous substances, the
dis-posal of removed material, or the taking of
such other actions as may be necessary to
prevent, minimize, or mitigate damage to the
public health or welfare or to the
environ-ment, which may otherwise result from a
re-lease or threat of rere-lease (2) Under the
Fed-eral Oil Pollution Act of 1990: Containment
or removal of oil or a hazardous substance
from water and shorelines or the taking of
other actions as may be necessary to minimize
or mitigate damage to the public health or
welfare, including, but not limited to, fish,
shellfish, wildlife, and public and private
property, shorelines and beaches (3) Under
the Federal Water Pollution Control Act:
Containment and removal of the oil or
haz-ardous substances from the water and
shore-lines or the taking of such other actions as
may be necessary to minimize or mitigate
damage to the public health or welfare,
in-cluding, but not limited to, fish, shellfish,
wildlife, and public and private property,
shorelines and beaches
renal
Related to or associated with the kidney
renege
That customer or user behavior in which an
individual leaves the queue or line after
wait-ing for some period of time
renewable energy
Energy obtained from sources that are
essen-tially inexhaustible (unlike, for example, the
fossil fuels, of which there is a finite supply)
Renewable sources of energy include wood,
waste, photovoltaic, and solar thermal energy
rental of railroad cars
Establishments primarily engaged in renting
or leasing railroad cars, whether or not also
performing services connected with the use
thereof, or in performing services connected
with the rental of railroad cars
rep
See roentgen equivalent physical.
repair
(1) Systems To restore that which is
inoper-able or operinoper-able only at reduced capability to
full capability by replacement of components,
assemblies, or subsystems (2) Medical The
physical or mechanical restoration of
dam-aged tissues, especially the replacement ofdead or damaged cells in a body tissue or or-gan by healthy new cells
repeat violation
OSHA As defined in case law, if the same
standard has been violated more than once bythe same employer and there is a substantialsimilarity of violative elements between cur-rent and prior violations, the violation will beconsider “repeated.”
repeatability
(1) Instrumentation The ability of an
instru-ment to reproduce readings repeatedly when
sampling the same concentration (2) pling The closeness of agreement between
Sam-samples that are collected simultaneously
repeated measures design
An analysis of variance technique in whicheach subject is exposed to more than one con-dition
repetitive element
See regular element.
Repetitive motions, especially those which place the joints in awkward positions can lead to serious injuries
repetitive motion injury (RMI)
Any of a class of pathologies created throughexcessively frequent use of a particular joint
or tissue, especially in combination withawkward positioning, inadequate or no restperiods, or excessive loads Also referred to
Trang 36as cumulative trauma disorder, repetitive
strain injury, repetitive trauma disorder,
re-petitive stress injury, and overuse syndrome.
repetitive strain injury
See repetitive motion injury.
repetitive stress injury
See repetitive motion injury.
repetitive time method
See repetitive timing.
repetitive timing
A work measurement time study technique in
which the duration of each work element is
measured and recorded in sequence as it is
performed, then the timing device is
immedi-ately reset to zero to begin timing the duration
of the next element Also referred to as
re-petitive time method, discontinuous timing,
flyback timing, snapback method, and
snap-back timing.
repetitive trauma disorder
See repetitive motion injury.
repetitive work
A work activity in which the work or task
elements are continuously repeated over a
prolonged period of time
replace
To substitute one unit for another or to return
something to its original position
replacement air
Air supplied to a space to replace exhausted
air See also make-up air (the two terms are
synonymous)
replacement standard
The estimated useful life of a motor vehicle
expressed in time (months or years) and/or
utilization (miles)
replacement therapy
The use of synthetic substances or substances
recovered from natural sources to substitute
for an organ, gland, or other body structure
which is no longer present or has ceased
functioning
replacement vehicle
A vehicle acquired to replace a vehicle in
in-ventory that meets the replacement standard
or becomes uneconomical to retain in service
replicate
To conduct an experiment which uses thesame methodology but is independent of apreviously conducted experiment
replicate samples
More than one sample collected at the sametime and place for the purpose of determiningtheir reproducibility
report writer
Software which can transform database,spreadsheet, or other information into a hard-copy format which is understandable bysomeone not familiar with the software May
also be referred to as report generator.
reportable accident
(1) Safety Any accident that meets the
crite-ria established under 29 CFR 1904 and must
be reported on the OSHA 200 Log (an annualreport summarizing occupational injuries and
illnesses) (2) Transit A motor vehicle
acci-dent involving a carrier subject to the partment of Transportation Act, which results
De-in a fatality, De-injury, or property damage of
$4,400 or more
reportable damage
Rail Operations Includes labor costs and all
other costs to repair or replace in kind aged on-track equipment, signals, track, trackstructures, or roadbed Reportable damagedoes not include the cost of clearing a wreck;however, additional damage to the abovelisted items caused while clearing the wreck is
dam-to be included in your damage estimate amples of other costs included in reportabledamage are a) rental and/or operation of ma-chinery such as cranes, bulldozers, etc in-cluding the services of contractors, to replace
Ex-or repair the track right-of-way and associatedstructures; and b) costs associated with therepair or replacement of roller bearings onunits that were derailed or submerged in water(replacement costs mean the labor costs re-sulting from a wheel set change out)
reportable death, injury or illness
Railroad Any event arising from the operation
of a railroad which results in a) death to one
or more persons; b) injury to one or morepersons, other than railroad employees, thatrequires medical treatment; c) injury to one
or more employees that requires medicaltreatment or results in restriction of work or
Trang 37motion for one or more days, one or more lost
workdays, transfer to another job, termination
of employment, or loss of consciousness; or
d) any occupational illness of a railroad
em-ployee, as diagnosed by a physician
reportable quantity (RQ)
The quantity of a hazardous substance that
triggers reports under CERCLA If a
sub-stance is released in amounts exceeding its
RQ, the release must be reported to the
Na-tional Response Center, the SERC, and the
community emergency coordinators for areas
likely to be affected
reportable vehicle
All sedans, station wagons, ambulances,
buses, carryalls, trucks and truck tractors
Excluded are semitrailers, trailers, and other
trailing equipment such as pole trailers,
dol-lies, cable reels, trailer coaches and bodies,
portable wheeled compressors, trucks with
permanently mounted equipment (e.g
gen-erators, air compressors, etc.), fire trucks,
motorcycles, electric and hybrid powered
electric vehicles and military design motor
vehicles
reporting point
A geographical location in relation to which
the position of an aircraft is reported
reporting threshold
Rail Operations The level of railroad
prop-erty damage, resulting from a train accident
involving on-track equipment, over which a
railroad company must report the accident to
the Federal Railroad Administration
Report-able damages include the cost of labor and the
cost of repairing (or replacing in kind)
dam-aged on-track equipment, track, track
struc-ture, or roadbed
reporting unit
Any Coast Guard Command having its own
OPFAC (Operating Facility) code (and,
there-fore, an individual accountability)
repository
Under the Federal Nuclear Waste Policy Act
of 1982: Any system designed by the Nuclear
Regulatory Commission that is intended to be
used for, or may be used for, the permanent
deep geological disposal of high-level
radio-active waste and spent nuclear fuel, whether
or not such system is designed to permit the
recovery, for a limited period during initial
operation, of any materials placed in suchsystem Such term includes both surface andsubsurface areas at which high-level radioac-tive waste and spent nuclear fuel handling ac-tivities are conducted
repowering
According to the Clean Air Act: Rep lacement
of an exi sting coal-fired boiler with one of thefol lowing clean coal techno logies : atmo spheri c
or pressu rized fluidi zed bed comb ustion , teg rated gasifi cation combi ned cy cle, magneto -hyd rodynamics, direct and indirect coal -fired turbines, integ rated gasifi cation fuel cells, or as det ermined by the EPA Admin istrat or, in con sultat ion wi th the Secretary of Energy, aderivative of one or more of these tech-nologies, and any other technology capable ofcontrolling multiple combustion emissionssimultaneously with improved boiler or gen-eration efficiency and with significantlygreater waste reduction relative to theperformance of technology in widespreadcommercial use as of November 15, 1990
"forgetting" unpleasant situations as a way ofavoiding them
reproducibility
Instrumentation The precision of a single
measurement on the same sample made bydifferent operators, using different in struments
Trang 38The process by which a living entity or
organism produces a new individual of the
same kind
reproduction rate
The ratio of the total number of births from
women of reproductive age to the number of
women within that age group in the
population
reproductive toxicity
A harmful effect to the adult reproductive
system The ability of a substance or physical
agent to adversely affect the reproductive
system
reproductive toxin
A substance that has the capability to
adversely affect the adult reproductive
system
required evaporation rate
The amount of water from sweat or other
sources which must evaporate from the body
surface into the atmosphere per unit time to
maintain the body's heat balance
required sweat rate
The volume of sweat per unit time which
must be secreted to assure adequate body
cooling
requirements contract
A legal agreement for a supplier to provide
and for a buyer to purchase one or more types
of products or materials for a specified period
of time, usually at a specified price and
delivery terms
re-refined oil
Under the Federal Solid Waste Disposal Act:
Used oil from which the physical and
chemi-cal contaminants acquired through previous
use have been removed through a refining
process
reregistration
The reevaluation and relicensing of existing
pesticides originally registered prior to current
scientific and regulatory standards EPA
re-registers pesticides through its Registration
Standards Program
res judicata
Latin A legal doctrine, meaning "the thing is
decided," preventing new litigation by the
same parties on the same matter after it has
been fully adjudicated
rescissory damages
Such damages contemplate a return of theinjured party to the position he/she occupiedbefore he/she was induced by wrongful con-duct to enter into the transaction When re-turn of the specific right, property, etc is notpossible (e.g., in a stock fraud transaction, thestock is no longer available), the rescissorydamages would be the monetary equivalent(e.g., the value of the stock)
rescue coordination center (RCC)
A search and rescue (SAR) facility equippedand manned to coordinate and control SARoperations in an area designated by the SARplan The U.S Coast Guard and the U.S AirForce have responsibility for the operation ofRCCs
rescue doctrine
Under this doctrine, one who has, throughhis/her negligence, endangered the safety ofanother may be held liable for injuries sus-tained by a third person who attempts to savethe other from injury
of accepted theories or laws in the light ofnew facts
research and development (R & D)
The process of attempting to find new edge for commercial use in creating a newproduct or improving current products
knowl-Research and Special Programs tion (RSPA)
Administra-The Administration was established formally
on September 23, 1977 It is responsible forhazardous materials transportation and pipe-line safety, transportation emergency prepar-edness, safety training, multimodal transpor-tation research and development activities,and collection and dissemination of air carriereconomic data It includes the Office of Haz-ardous Materials Safety; the Office of Pipe-line Safety; the Office of Research Technol-ogy, and Analysis; the Office of UniversityResearch and Education; the Office of Auto-mated Tariffs; the Office of Research Policy
Trang 39and Technology Transfer; the Volpe National
Transportation Systems Center; and the
Transportation Safety Institute
reserve
That amount of energy, strength, heart rate, or
other quantity which is available to an
indi-vidual but which is not being used in the
cur-rent activity
reservoir
Any natural or artificial holding area used to
store, regulate, or control water
reset device
Rail Operations A device whereby the
brakes may be released after an automatic
train control brake application
residential district
The territory adjacent to and including a
highway which is not a business district and
for a distance of 300 feet or more along the
highway is primarily improved with
resi-dences
residential solid waste
The wastes generated by the normal activities
of households including, but not limited to,
food wastes, rubbish, ashes, and bulky wastes
Residential Transportation Energy
Consump-tion Survey (RTECS)
This survey was designed by the Energy
In-formation Administration of the Department
of Energy to provide information on how
en-ergy is used by households for personal
vehi-cles It has been conducted five times since
1979, the most recent being 1991
residential vehicle
Motorized vehicles used by U.S households
for personal transportation Excluded are
motorcycles, mopeds, large trucks, and buses
Included are automobiles, station wagons,
passenger vans, cargo vans, motor homes,
pickup trucks, and jeeps or similar vehicles
To be included, vehicles must be a) owned by
members of the household, or b) company
cars not owned by household members but
regularly available to household members for
their personal use and ordinarily kept at home,
or c) rented or leased for 1 month or more
residual
Amount of a pollutant remaining in the
envi-ronment after a natural or technological
proc-ess has taken place, e.g., the sludge remaining
after initial wastewater treatment, or lates remaining in air after the air passesthrough a scrubbing or process
residual fuel oils
(1) The topped crude of refinery operations,which includes No 5 and No 6 fuel oils, asdefined in ASTM Specification D 396 andFederal Specification, VV-F-815C; NavySpecial Fuel oil as defined in Military Speci-fication MIL-F-859E including Amendment 2(NATO symbol F-77); and Bunker C fuel oil.Residual fuel oil is used for the production ofelectric power, space heating, vessel bunker-ing, and various industrial purposes (2) Theheavier oils that remain after the distillate fueloils and lighter hydrocarbons are distilledaway in refinery operations and that conform
to American Society for Testing and Materials(ASTM) Specifications D396 and 975 In-cluded are No 5, a residual fuel oil of me-dium viscosity; Navy Special, for use insteam-powered vessels in government serviceand in shore power plants; and No 6, whichincludes Bunker C fuel oil and is used forcommercial and industrial heating, electricitygeneration, and to power ships Imports of re-sidual fuel oil include imported crude oilburned as fuel
residual hearing
That capability for hearing retained by an dividual with hearing loss
in-residual radioactive material
Under the Federal Uranium Mill Tailings diation Control Act of 1978: Waste (whichthe Secretary of Energy determines to be ra-dioactive) in the form of tailings resultingfrom the processing of ores for the extraction
Ra-of uranium and other valuable constituents Ra-ofthe ores and other radioactive waste at a proc-essing site which relates to such processing,including any residual stock of unprocessedores or low-grade materials
residual risk
That risk that remains after the application orimplementation of controls, barriers, or otherrisk-reducing methods or techniques
Trang 40residual strength
The maximum value of nominal stress that a
cracked body is capable of sustaining,
ne-glecting the area of the crack itself
residual stress
The stress that remains in a structure after
processing, fabrication, assembly, testing, or
operation (for example, welding-induced
re-sidual stress)
residual volume
The volume of air remaining in the lungs after
a maximal expiration Also called residual
air
residue
(1) With regard to solid wastes, all solids that
remain after completion of thermal
process-ing, including bottom ash, fly ash, and grate
siftings (2) The hazardous material
remain-ing in a packagremain-ing, includremain-ing a tank car, after
its contents have been unloaded to the
maxi-mum extent practicable and before the
pack-aging is either refilled or cleaned of hazardous
material and purged to remove any hazardous
vapors
residue rule
States that any residue left in empty
contain-ers will not be regulated under RCRA
pro-vided that all hazardous wastes are removed
from the container using the practice
com-monly employed to remove materials from
that type of container and that no more than
one inch of residue remains Also referred to
as the one inch rule.
resilience
The ratio of energy given up on a recovery
from deformation to the energy required to
produce the deformation in an elastic
struc-ture
resist-dyeing
A textile coloring technique in which a
sub-stance which prevents dyeing is applied to
certain threads before dyeing to produce
col-oring patterns
resistance
(1) Opposition of a conductor to passage of
electricity or other energy or substance See
also electrical resistance (2) The ability of
an organism to withstand a noxious influence
For plants and animals, the ability to
with-stand poor environmental conditions and/or
attacks by chemicals or disease The abilitymay be inborn or developed (3) In studies ofrespiration, an expression of the opposition toflow of air produced by the tissues of the airpassages, in terms of pressure per amount ofair per unit of time (4) In psychoanalysis,opposition to the coming into consciousness
of repressed material
resistance arm
That portion of a lever arm from the fulcrum
to the point at which the resistance is applied
resistance heating
The use of electrical resistance to provideheat, normally within a relatively confined orlocalized volume
resistance strain gauge
A transducer constructed of a material whichchanges electrical resistance under stress ordeformation
resistance thermometer
A device containing a sensing element whoseelectrical resistance varies as a known func-tion of temperature and thus can provide atemperature measurement
resolution
(1) Instrumentation The smallest change in
concentration of a contaminant that will duce a detectable change in instrument output
pro-(2) Electronics The number of horizontal
and vertical pixels which are available fordisplay on a screen at any given time
(1) General A phenomenon in which an
ex-ternally forced oscillation imposed on aphysical-mechanical system causes a maximaloscillatory response amplitude in that system
(2) Acoustics Exists when any changes,
however small, in the frequency of excitation