Iec 60846 2 2015

Radiat ion prot ect ion inst rument at ion – Ambient and/or direct ional dose equivalent rat e met ers and/or monit ors for bet a, X and gamma radiat ion – Part 2: High range bet a and p

Radiat ion prot ect ion inst rument at ion – Ambient and/or direct ional dose

equivalent (rat e) met ers and/or monit ors for bet a, X and gamma radiat ion –

Part 2: High range bet a and phot on dose and dose rat e port able inst rument s for

Inst rument at ion pour la radioprot ect ion – Inst rument s pour la mesure et /ou la

survei lance de l équivalent de dose (ou du débit d’équivalent de dose) ambiant

et /ou direct ionnel pour les ray nnement s bêt a, X et gamma –

Part ie 2: Inst rument s port ables de grande ét endue, pour la mesure de la dose et

du débit de dose des ray nnement s phot oniques et bêt a dans des sit uat ions

d’urgence de radioprot ect ion

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R adiat ion prot ect ion inst rument at ion – Ambient and/or direct ional dose

equivalent (rat e) met ers and/or monit ors for bet a, X and gamma radiat ion –

Part 2: High range bet a and phot on dose and dose rat e port able inst rument s for

Inst rument at ion pour la radioprot ect ion – Inst rument s pour la mesure et /ou la

survei lance de l équivalent de dose (ou du débit d’équivalent de dose) ambiant

et /ou direct ionnel pour les rayonnement s bêt a, X et gamma –

Part ie 2: Inst rument s port ables de grande ét endue, pour la me ure de la dose et

du débit de dose des rayonnement s phot oniques et bêt a dans des sit uat ions

d’urgence de radioprot ect ion

INT ERNAT IONAL

ELECT ROT ECHNICAL

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FOREWORD 4

1 Sco e an o ject 6

2 Normative ref eren es 6

3 Terms an def i ition 7

4 Units an lst of s mb ls 7

5 General c aracteristic of ambient dose eq ivalent (rate) meters for emergen y purp ses 7

5.2 Re d-out 7

5.3 Dose eq ivalent an dose eq ivalent rate ran e 7

5.5 Minimum ran e of me s rement 7

5.15 Porta i ty 7

5.16 Protection of switc es 8

5.17 Use of exten ion pro e 8

5.18 Contamination pro e 8

6 General test proced res 8

7 Ad itivity of in icated value 8

8 Radiation p r orman e req irements an tests 8

8.4 Variation of the resp n e d e to photon radiation energy an an le of in iden e 8

8.4.3 Me s rin q antity H' 0,0 ), ' H  (0,0 ), H*(10) or H  *(10) for teles o ic or remote c l n rical pro es 8

8.5 Variation of the resp n e d e to b ta radiation energy an an le of in iden e 10 8.5.1 Me s rin q antity H' 0,0 ) or H ′  (0,0 ) 10 8.7 Line rity an statistical f l ctuation 10 8.7.2 Req irements 10 8.14 Extracameral resp n e 10 8.14.1 Req irements 10 8.14.2 Method of test 10 8.15 Resp n e of in trument with exten ed pro e 10 8.15.1 Req irements 10 8.15.2 Method of test 1

9 Electrical c aracteristic of directional an ambient dose eq ivalent (rate) meters 1

9.2 Warm-up time 1

9.2.1 Req irements 1

9.2.2 Test method 1

9.2.3 Interpretation of the res lts 1

10 Mec anical c aracteristic of directional an ambient dose eq ivalent (rate) meters 1

10.4 Dro test 1

10.4.1 Req irements 1

10.4.2 Method of test 12

10.4.3 Interpretation of the res lts 12

1 En ironmental c aracteristic , p rorman e req irements an tests 12

1 2 Ambient temp rature 12

1 2.1 Req irements 12

Ta le 5 – Radiation c aracteristic of directional dose eq ivalent (rate) meters 15

Ta le 6 – Radiation c aracteristic of ambient dose eq ivalent (rate) meters 16

Ta le 7 – Electrical, mec anical an en ironmental c aracteristic of directional an

ambient dose eq ivalent (rate) meters 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION

_

Part 2: High range beta and photon dose and dose rate portable

instruments for emergency radiation protection purposes

1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio for sta d rdiz tio c mprisin

al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote

intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic f i ld To

this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cific tio s,

Te h ic l Re orts, Pu lcly Av ia le Sp cif i atio s (P S) a d Guid s (h re f ter refer e to a “IEC

Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te

in th s bje t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n n

-g v rnme tal org niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely

with th Intern tio al Org niz tio for Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b

a re me t b twe n th two org niz tio s

2) Th f ormal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

c n e s s of o inio o th rele a t s bje ts sin e e c te h ic l c mmite h s re re e tatio fom al

intere te IEC Natio al Commite s

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Commite s in th t s n e Whie al re s n ble ef forts are ma e to e s re th t th te h ic l c nte t of IEC

Pu lc tio s is a c rate, IEC c n ot b h ld re p n ible for th wa in whic th y are u e or f or a y

misinterpretatio b a y e d u er

4) In ord r to promote intern tio al u if ormity, IEC Natio al Commite s u d rta e to a ply IEC Pu lc tio s

tra s are tly to th ma imum e te t p s ible in th ir n tio al a d re io al p blc tio s An div rg n e

b twe n a y IEC Pu lc tio a d th c re p n in n tio al or re io al p blc tio s al b cle rly in ic te in

th later

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6) Al u ers s o lde s re th t th y h v th late t e itio of this p blc tio

7) No la i ty s al ata h to IEC or its dire tors, emplo e s, s rv nts or a e ts in lu in in ivid al e p rts a d

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oth r d ma e of a y n ture wh ts e er, wh th r dire t or in ire t, or for c sts (in lu in le al f ee ) a d

e p n e arisin o t of th p blc tio , u e of, or rela c u o , this IEC Pu lc tio or a y oth r IEC

Pu lc tio s

8) Ate tio is drawn to th Normativ refere c s cite in this p blc tio Us of th refere c d p blc tio s is

in is e s ble for th c r e t a plc tio of this p blc tio

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible for id ntif yin a y or al s c p te t rig ts

International Stan ard IEC 6 8 6-2 has b en pre ared by s bcommite 4 B: Radiation

protection in trumentation, of IEC tec nical commit e 4 : Nu le r in trumentation

This secon edition can els an re laces the first edition of IEC 6 8 6-2, is ued in 2 0 , as

wel as IEC 61018, is ued in 19 1; it con titutes a tec nical revision

The main tec nical c an e with regard to the previou edition con ists of an update to the

revised edition of IEC 6 8 6-1:2 0

This International Stan ard IEC 6 8 6-2 is to b u ed in conju ction with IEC 6 8 6-1:2 0

For the purp ses of this stan ard, clau es/s bclau es of IEC 6 8 6-1:2 09 a ply, without

modification , ex e t when stated The modified clau es/s bclau es are identif ied by the

same n mb r as in IEC 6 8 6-1:2 0 or, for new clau es/s bclau es, by a hig er n mb r not

u ed in IEC 6 8 6-1:2 0

The text of this standard is b sed on the fol owin doc ments:

Ful inf ormation on the votin f or the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publ cation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A lst of al p rts of the IEC 6 8 6 series, u der the general title Rad iat ion prot ectio

instrume tatio – Ambie t a d /or d ire t io al d ose e uiv lent ( ate) meters a d /or mo itors for

b ta, X a d g mma rad iatio , can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "ht p:/we store.iec.c " in the data

related to the sp cif i publ cation At this date, the publ cation wi b

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

RA DIA TION PROTECTION INSTRUMENTA TION –

Part 2: High range beta and photon dose and dose rate portable

instruments for emergency radiation protection purposes

1 Scope and object

This p rt of IEC 6 8 6 a pl es to p rta le or tran p rta le dose eq ivalent (rate) meters

an /or monitors for the me s rement of ambient an /or directional dose eq ivalent (rate) f rom

external b ta, X an gamma radiation for energies up to 10 MeV d rin emergen y situation

The o ject of this International Stan ard is to sp cify the desig req irements an the

p rorman e c aracteristic of dose eq ivalent (rate) meters inten ed for the determination of

ambient an /or directional dose eq ivalent (rate) as def i ed in ICRU Re ort 4 u der

emergen y con ition With the ex e tion of modified or new clau es lsted b low, al clau es

in IEC 6 8 6-1:2 0 are a pl ca le for in truments u ed for emergen y purp ses

This International Stan ard do s not sp cify whic in truments are req ired nor do s it

con ider the n mb rs or sp cif i location of s c in truments This International Stan ard

do s not identify in trumentation for sp cific typ s of ac idents It is es ential that the rated

ranges of the in truments an the radiological an non- adiological con ition for whic the

in truments are desig ed adeq ately cover the ac ident an p st-ac ident con ition as

determined by ac ident analy is an /or sp cified by a pro riate reg latory authorities or

q al f ied in ivid als It is exp cted that ac idents wi in olve b th dose eq ivalent (rate) an

en ironmental extremes (e.g temp rature an h midity) Sp cif i ation for in truments for

me s rin dose eq ivalent rates les than the minimum detecta le dose rate level sp cif ied

in this International Stan ard are contained in IEC 6 8 6-1:2 0 Where s c in truments are

also u ed f or emergen y me s rements, the req irements of this International Stan ard

a ply

Althou h this International Stan ard sp cif ies the req irements for in truments primari y for

emergen y u e, s c in truments may also b u ed for on-site me s rements at other times

If the in trument has a remote detector an if an ad itional detector is provided in the

me s rin as embly to me s re dose eq ivalent rate at the location of the o erator, the

req irements a ply to b th of the detectors

The f ol owin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le for its a pl cation For dated referen es, only the edition cited a ples For

u dated referen es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

This clau e of IEC 6 8 6-1:2 0 a pl es, with the f ol owin ad itional referen es:

IEC 6 3 5:2 0 , Rad iat ion prote tio instrume tation – Alph , b ta a d alp a/b ta (b ta

e erg > 6 k eV) c ntamin tio met ers a d mo it ors

IEC 6 8 6-1:2 0 , Rad iation protectio instrume t ation – Ambient a d /or dire tio al d ose

e uivalent (at e) met ers a d /or mo it ors for b ta, X a d g mma rad iat ion – P art 1: P ortable

workplac a d e viro me tal meters a d mo itors

For the purp ses of this stan ard, the u its an l st of s mb ls given in 4.1 to 4.2 of

IEC 6 8 6-1:2 0 a ply, without modification

5 General c aracteristics of ambient dose equivalent (rate) meters f or

For the purp ses of this stan ard, 5.1 to 5.14 of IEC 6 8 6-1:2 0 a ply, without

modification , ex e t as stated in the fol owin s bclau es The c an ed s bclau es are

identified by the same n mb r as in IEC 6 8 6-1:2 0 or, for new s bclau es, by a hig er

n mb r not u ed in IEC 6 8 6-1:2 0

Sin le s ale is pref er ed If multiple s ales are u ed, the c an in of me s rin ran e an

re d-out s ale s al b simultane u an s al b cle rly displayed Al s ales s al b

re da le u der normal l g tin con ition

5.3 Dos e uiv le t a d dos e uiv le t rate ra ge

The implementation of ICRP recommen ation req ires the determination of dose eq ivalent

rate over a wide ran e of values Un er some circ mstan es, dose eq ivalent rates as hig

as 10 Sv h

1

req ire me s rement For a pl cation as an emergen y in trument, the dose

eq ivalent rates of interest are within the ran e fom a proximately 1 mSv h

The minimum eff ective ran e of me s rement of dose eq ivalent rate s al cover at le st f our

orders of mag itu e an s al in lu e the ran e f rom 1 mSv h

In the case of s rvey meters, the complete in trument s ould not ex e d 4 k in weig t an

s al b eq ip ed with han les, stra s or other me n to f aci tate o eration whi e b in

car ied It is recog ized that an exten ion pro e or some other me n may b req ired to

red ce the dose to the o erator

5.16 Prote tion of switc e

Switc es an other controls s al b protected to prevent inad ertent de-activation or mal

-o eration of the in trument

5.17 Us of e te sion pro e

If an exten ion pro e is to b u ed, the in trument in lu in the pro e an al as ociated

eq ipment neces ary for me s rements in lu ing the exten ion device exten ed to the worst

case config ration s al b tested Detai s of the test method s al b made avai a le alon

with the res lts

5.18 Contamination probe

Emergen y dose rate monitors are f req ently provided with a s rf ace contamination pro e

This pro e s al me t the req irements of IEC 6 3 5

modification , ex e t as stated in the fol owin s bclau es The c an ed s bclau es are

identified by the same n mb r as in IEC 6 8 6-1:2 0 or, for new s bclau es, by a hig er

Where teles o ic or remote c l n rical pro es with their cal bration direction p rp n ic lar to

the axis of s mmetry are u ed f or emergen y in trumentation, this s bclau e 8.4.3 re laces

8.4.1 an 8.4.2 of IEC 6 8 6-1:2 0 In al other cases, s bclau es 8.4.1 an 8.4.2 of

IEC 6 84 -1:2 0 a ply, without modification

8.4.3.2 Re uireme ts

The variation of the relative resp n e d e to a c an e of the photon radiation energ an

an le of photon radiation in iden e s al not ex e d the fol owin values:

• – 9 % to 6 % f or photon radiation energies of 8 keV to 1,5 MeV an an le of photon

radiation in iden e of 0° to ± 0° an 18 ° to (18 ° ± 6 °)

• – 7,5 % to 15 % f or photon radiation energies of 8 keV to 1,5 MeV an an le of photon

radiation in iden e of ± 0° to ±12 °; however, at an le of photon radiation in iden e of

9 °±10° a lower resp n e of – 0 % is al owed

• – 7,5 % to 15 % f or photon radiation energies of 1,5 MeV to 7 MeV an an le of photon

radiation in iden e of 0° to ± 0° an 18 ° to (18 ° ± 6 °)

Al in icated dose values s al b cor ected for non-lne r resp n e an , if neces ary, for the

ef fect of the influen e q antity dose rate

Where more than one detector is uti zed, then these req irements s al a ply to e c

detector

NOT Th ra g of th re p n e –2 % to + 7 % c re p n s to th ra g of th c re tio fa tor 1,0 ± 0,4

Th ra g of th re p n e –3 ,5 % to 15 % c re p n s to th ra g of th c re tio fa tor 1,0 ± 0,6

8.4.3.3 Method of te t

The tests with X- ay s ould b p rormed u in the nar ow-sp ctrum series of radiation

q al ties of ISO 4 3 -1, however if very hig dose rates are req ired, the wide-sp ctrum

series or hig air kerma rate series may b req ired

In order to minimize the n mb r of me s rements, in a first ste the minimum rated photon

energ is determined where b th req irements on energy an ang lar dep n en e of

resp n e are met:

• The energ de en en e of resp n e for an les of in iden e of α = 0° normal zed to its

value at

13

Cs gamma energ , R(E

i0°), is me s red an plot ed vers s the photon

energ at the p ints of the me n energies (fluen e weig ted) of the u ed X- ay sp ctra, E

i

• The photon energ where the variation of the relative resp n e fal s outside – 9 % to

+ 7 % (f or 8 keV up to 1,5 MeV) or outside – 7,5 % to +15 % (f or 1,5 MeV up to 7 MeV)

is determined

• F r the radiation q al ty with the me n energ a ove the lower photon energ th s

determined, the relative resp n e is me s red for al an les b twe n 0° an 18 ° at 15°

intervals in two p rp n ic lar planes containin the ref eren e direction throu h the

ref eren e p int of the dose eq ivalent (rate) meter

– If f or this radiation q al ty, al variation of the relative resp n e are b twe n – 9 % to

– Otherwise, the radiation q al ty with the hig er me n energ s al b c osen

For b th radiation q al ties u ed in the test, al me s red resp n es are ploted as a fu ction

of photon energ in a l n-log gra h Eac two resp n es b lon in together s al b

con ected by a straig t l ne The minimum an maximum rated photon energ is o tained by

the intersection of the straig t l ne with the sp cif ied l mits at the hig est photon energy

In a secon ste , further radiation q al ties in the rated ran e of u e s al b c osen to prove

that al normal zed resp n es R(E,α) are within its sp cif ied l mits One radiation q al ty is

determined by the maximum energ of the rated ran e of u e If the normal zed resp n es

R(E

i, 0°) determined b fore have extreme values in the rated ran e, then the cor esp n in

radiation q al ties are f urther values for these tests con ernin the an le of in iden e,

otherwise at le st one q al ty s al b c osen within the rated ran e

In prin iple, it is desira le that this test b p rf ormed at the same dose eq ivalent (rate) for

e c radiation q al ty In practice, this may not b p s ible, in whic case, the in icated dose

eq ivalent (rate) f or e c radiation q al ty s al b cor ected for the relative resp n e at the

in icated dose eq ivalent (rate) (se 6.10 of IEC 6 8 6-1:2 0 )

8.4.3.4 Interpretation of the re ults

If al the variation of the relative resp n e of the rated ran e of u e d e to photon radiation

energy an an le of in iden e are within the l mits given in 8.4.3.2, then the req irements can

b con idered to b met

8.5 Variation of the re pons du to beta ra iation e ergy a d a gle of incid nc

8.5.1 Me s ring qu ntity H'(0,0 ) or H′



(0,0 )

8.5.1.1 Re uireme ts

The variation of the relative resp n e of the directional dose eq ivalent (rate) meter to b ta

radiation prod ced by the referen e radiation of

9

Sr/

9

Y in the cal bration direction, i.e 0°

radiation in iden e, s al b b twe n – 3 % to +10 % In ad ition, the resp n e to the

ref eren e radiation of

If al the variation of the relative resp n e of the rated ran e of u e d e to b ta radiation

energ at 0° an le of in iden e are within – 3 % to +10 %, then the req irements can b

con idered to b met

8.7 Line rity a d statistic l f luctuations

The in trument s al not ex ibit an extracameral resp n e gre ter than or eq al to 2 % of

s ale re din when exp sed to a dose rate gre ter than or eq al to 1 Sv h

With the detector an its s r ou din hou in s ielded or not in the radiation field, exp se the

rest of the in trument, in lu in ca le, electronic (not contained in the hou in in whic the

detector is contained), an the in icatin device, to a dose rate of 1 Sv h

Y (one af ter the other) f or at le st 10 min The

s ale re din (in icated value) s al b les than 2 % of the ir adiated dose rate: that is les

The in trument with an exten ed pro e s al ex ibit no c ange in radiation c aracteristic

defined a ove when tested up to the maximum exten ion (or ca le len th) sp cified by the

man f acturer Where multiple detectors are uti zed to cover the entire ran e, they s al b

tested se arately

8.15.2 Method of te t

The in trument s al b tested as req ired in 8.1 throu h 8.14 with the detector located at the

minimum an maximum distan es (or ca le len th) sp cif ied by the man facturer The

resp n e s al b the same, within 5 %, for b th distan es (or ca le len th)

9 Ele trical chara teristics of directional and ambient dose equiv lent (rate)

meters

For the purp ses of this stan ard, 9.1 to 9.3 of IEC 6 8 6-1:2 0 a ply, without

modification , ex e t as stated in the f ol owin s bclau es The c an ed s bclau es are

identified by the same n mb r as in IEC 6 8 6-1:2 0 or, for new s bclau es, by a hig er

n mb r not u ed in IEC 6 8 6-1:2 0

9.2 Warm-up time

The in trument s al b ca a le of startin o eration at the lowest temp rature of the rated

ran e an o erate as normal y One (1) min te after in trument switc ed on, the in ication

s al not diff er by more than 10 % f rom the value o tained after 6 min

The dose eq ivalent meter with the b t eries fited s al b placed f or at le st 4 h in ide the

en ironmental c amb r with the temp rature at – 5 °C With the dose eq ivalent (rate) meter

switc ed of f, exp se it to an a pro riate radiation source that wi provide an in ication in the

secon most sen itive ran e Switc on the in trument an note the re din s every 15 s

d rin a p riod of 2 min after switc in on

6 min after switc in on take a s f ficient n mber of re din s an u e the me n value as the

f i al value of the in ication

9.2.3 Interpretation of the re ults

From the gra h of re din s as a fu ction of time determine the re din af ter 1 min If this

value do s not dif fer by more than 10 % f rom the value o tained after 6 min then the

requirements of 9.2.1 are met

10 Mechanical characteristics of directional and ambient dose equivalent (rate)

meters

For the purp ses of this stan ard, 10.1 to 10.3 of IEC 6 8 6-1:2 0 a ply, without

modif i ation , ex e t as stated in the fol owin s bclau es The c an ed s bclau es are

identified by the same n mb r as in IEC 6 8 6-1:2 0 or, for new s bclau es, by a hig er

n mb r not u ed in IEC 6 8 6-1:2 0

10.4 Drop te t

10.4.1 Re uireme ts

Porta le dose eq ivalent (rate) meters u ed for emergen y purp ses s al b a le to

with tan without damage, a dro f rom a heig t of 1 m (distan e f rom grou d p int to s rf ace

of dose eq ivalent (rate) meter) onto a con rete f lo r The in trument p s es the test if the

in trument resp n e af ter the tests do s not deviate f rom the original resp n e by more than

–17 % to + 5 %

10.4.2 Method of te t

The dose eq ivalent (rate) meter s al b s bjected to at le st one sin le dro f rom 1 m to

e c s r ace of dose eq ivalent (rate) meter The test may b p r ormed either with one or

more test u its in s c a way that one dro onto e c s rf ace of the dose eq ivalent (rate)

meter is tested The resp n e of the in trument s al b determined b fore an af ter the test

If the dose eq ivalent recorded is imp rtant to me s rement, then the data recorded b fore

dro s al b maintained an s al not b in re sed by more than 0,7 H

0(H

0

is the lower lmit

of the ef fective ran e of me s rement The dro can make the in trument switc of but the

u er s al b a le to switc the u it b c on The dose eq ivalent (rate) meter s al b

in p cted an the phy ical con ition b doc mented

10.4.3 Interpretation of th re ults

If the in trument resp n e do s not deviate f om the original resp n e by more than –17 % to

+ 5 % an the in trument is in go d ph sical con ition then the req irements are met

11 Environme tal chara teristics, perf orma ce requirements and tests

For the purp ses of this stan ard, 1 1 to 1 7 of IEC 6 8 6-1:2 0 a ply, without

modif i ation , ex e t as stated in the fol owin s bclau es The c an ed s bclau es are

identified by the same n mb r as in IEC 6 8 6-1:2 0 or, for new s bclau es, by a hig er

n mb r not u ed in IEC 6 8 6-1:2 0

1 2 Ambie t temperature

The in icated values of the p rta le dose eq ivalent (rate) meters u ed f or emergen y

purp ses s al remain within the f ol owin ran es of the in icated values o tained at + 0 °C

over the f ol owin temp rature ran es:

a) As embl es for exten ed temp rature ran e: over the ran e of temp rature fom – 5 °C to

+ 0 °C, the in icated value s al not deviate by more than –17 % to + 5 % f om that

o tained u der stan ard test con ition It is recommen ed that p rta le as embl es b

desig ed to me t these req irements for outdo r u e

b) As embl es f or extreme temp rature ran e: where the as embly is to b u ed in hot er

con ition , the in icated value s al not deviate by more than – 3 % to + 3 % f om that

o tained u der stan ard test con ition over the temp rature ran e of – 5 °C to + 0 °C

c) As embl es for al temp rature ran es: where the as embly is to b u ed in hot er

con ition (e.g f ire), the in icated value s al not deviate by more than – 3 % to + 3 %

f rom that o tained u der stan ard test con ition over the temp rature ran e sp cif ied by

the man f acturer

The man facturer s al state the maximum temp rature the in trument can with tan

NOT Some me n of maintainin th b terie at a temp rature within th n min l o eratio ra g ma b

re uire wh n a s mble are o erate at temp rature b low –10 °C

1 2.2 Te t method

For this test, the dose (rate) meter s al b exp sed to a photon radiation source of s f ficient

inten ity providin an in ication in the secon most sen itive ran e The dose (rate) meter

an the photon source s al b ar an ed in a re rod cible ge metry for the test

The dose (rate) meter s al b held at a temp rature of + 0 °C ± 2 °C an al owed to sta i ze

f or a minimum of 6 min The in ication of the dose (rate) meter s al b determined The

dose (rate) meter an the source s al b removed fom this en ironment an placed directly

in an en ironmental c amb r s c that the same exp s re ge metry is esta l s ed an the

temp rature ne r the meter is maintained within 5 °C f or e c maximum an minimum

temp rature identified in the thre temp rature ran es given in 1 2.1 This proced re s al

b p r ormed in les than 5 min The temp rature s al then b maintained at e c of its

extreme values f or at le st 4 h, an the in ication of the dose (rate) meter me s red d rin

the last 3 min of the p riod The dose (rate) meter s al b removed f om the en ironmental

c amb r an returned to the f irst en ironment s c that the same exp s re en ironment is

esta ls ed an the temp rature ne r the meter is + 0 °C ± °C This proced re s al b

p rormed in les than 5 min The in ication s al then b determined d rin the last 3 min

of a 2 h p riod

It is not, in general, neces ary to control the h midity of the air in the c amb r u les the

meter is p rtic larly sen itive to c an es of h midity Humidity levels s ould b low enou h to

prevent con en ation (< 5 %)

1 2.3 Interpretation of the re ults

The req irements of IEC 6 8 6-1:2 0 a ply

1 3 Relativ humidity

The req irements of IEC 6 84 -1:2 0 a ply, with the ex e tion that the minimal rated ran e

covers al relative h midity levels up to 9 % at a temp rature of + 5 °C

1 8 Temperature s oc

The in icated value of the dose (rate) meter s al not vary by more than –17 % to + 5 % fom

the in icated value taken at a temp rature of + 0 °C when the temp rature is raised fom

+ 0 °C to + 0 °C or lowered f rom + 0 °C to –10 °C in les than 5 min

The in icated value of the dose (rate) meter s al not vary by more than –17 % to + 5 % fom

the in icated value taken at a temp rature of + 0 °C or –10 °C when the temp rature c an es

f rom either one of the a ove temp ratures to + 0 °C

1 8.2 Method of te t

For this test, the dose (rate) meter s al b exp sed to a photon radiation source of s f ficient

inten ity to provide an in ication in the secon most sen itive ran e The dose (rate) meter

an the photon source s al b ar an ed in a re rod cible ge metry for the test

The dose (rate) meter s al b held at a temp rature of + 0 °C ± 5 °C an al owed to sta i ze

f or a minimum of 6 min The in ication of the dose (rate) meter s al b determined The

dose (rate) meter an the source s al b removed f rom this en ironment an placed directly

in an en ironmental c amb r s c that the same exp s re ge metry is esta l s ed an the

temp rature ne r the meter is maintained b twe n + 5 °C an + 0 °C This proced re s al

b p rf ormed in les than 5 min The in ication s al then b determined every 15 min over a

p riod of 2 h The meter s al remain in this en ironment d rin the p riod to re c a sta le

temp rature

The dose (rate) meter s al b removed fom the en ironmental c amb r an returned to the

f irst en ironment s c that the same exp s re en ironment is esta l s ed an the

temp rature ne r the meter is + 0 °C ± 5 °C This proced re s al b p r ormed in les than

5 min The in ication s al then b determined every 15 min over a p riod of 2 h The meter

s al remain in this en ironment d rin the p riod neces ary to re c a sta le temp rature

The test s al b re e ted in ide the en ironmental c amb r with a temp rature ne r the

meter maintained b twe n –10 °C an – °C

1 8.3 Interpretation of the re ults

If the in trument in ication do s not deviate f rom the in ication at + 0 °C by more than –17 %

to + 5 % then the req irements are met

For the purp ses of this stan ard, al Ta les 1 to 9 of IEC 6 8 6-1:2 0 a ply, without

modif i ation , ex e t as stated in the f olowin Ta les The c an ed Ta les are identified by

the same n mb r as in IEC 6 8 6-1:2 0 The c an ed rows are marked by u derl nin the

resp ctive element for “Characteristic u der test or in uen e q antity” in e c Ta le

Table 5 – Ra iation c ara teristic of dire tional dos e uiv le t (rate) meters

0H

Table 6 – Ra iation c ara teristic of ambie t dos e uiv le t (rate) meters

Chara teristic u der te t or



0H

Chara teristic u der te t or



are th lower lmits of th me s rin ra g of d s e uiv le t a d d s e uiv le t rate

b

At le st ma imum v lu of me s rin ra g of d s rate

NOT Un erln d items in ic te a ditio s or c a g s to IEC 6 8 6- :2 0

Table 7 – Ele tric l me ha ic l a d e vironme tal c ara teristic

of dire tion l a d ambie t dos e uiv le t (rate) meters

Chara teristic u der te t or

Limit of v riatio fom th in ic tio at + 5 °C a d ref ere c h midity

NOT Un erln d items in ic te a ditio s or c a g s to IEC 6 8 6- :2 0

_ _ _ _ _ _