Photonuclear reactions formed via the irradiation of bremsstrahlung beam with end-point energy of 65 MeV from LINAC Pohang, Korea are presented.
Trang 1VNU JOURNAL OF SCIENCE, Mathematics - Physics, T.XXII, N04 , 20 06
S E A R C H I N G F O R P H O T O N U C L E A R R E A C T I O N O N N A T U R A L T i
W I T H 6 5 M E V B R E M S S T R A H L U N G
N g u y e n T ru n g T in h
College o f Science, V N U
A b s tra c t Photonuclear reactions formed via the irradiation of bremsstrahlung beam with end-point energy of 65 MeV from LINAC (Pohang, Korea) are presented
1 E x p e r im e n t
W ith h ig h e n e rg y b e am from a cc elera to r, m a n y re a c tio n s a p p e a r; th is is a very good chance for p ro d u c e ra d io a c tiv e isotopes In t h is p a p e r , som e p h o to n u c le a r reactions fo rm ed via t h e i r r a d i a t i o n of b r e m s s t r a h l u n g b e a m from LINAC (Pohang- Korea) are p r e s e n te d
1.1 I r r a d i a t i o n
The 65 M eV b r e m s s t r a h l u n g w ere p ro d u ce d by b o m b a r d in g e le ctro n beam (accelerated up to 65 MeV) in to T u n g s te n t a r g e t (W) T h is b r e m s s t r a h l u n g beam was used to i r r a d i a t e a T i 0 2 po w d er T he T i 0 2 p o w d e r s a m p le w a s c o n ta in e d in a cylinder w ith h = 5 m m , d = 10 m m A sc h em a tic d ia g r a m of t h e e x p e r im e n ta l set-up
is showed in Fig 1
F ig l A s c h e m a tic d ia g r a m of t h e e x p e r im e n t a t LIN A C , P o h a n g
The T1O2 p o w d e r w a s i r r a d i a t e d for 2.0 h w ith 65 M eV b r e m s s t r a h l u n g beam
a n d pulse e le c tro n b e a m w a s 40 mA T h e sa m p le w a s fixed a t one position
29
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1.2 M easu rem en t
- The decay tim e of ir r a d ia te d sam ple was from 2 to 60 h o u r s
- M e a s u rin g tim e v a rie d from 60 seconds up to 10 h o u rs
- G am m a sp e c tra w ere a n aly se d by u sing g am m a vision p ro g ra m
T he ir r a d ia te d sam p le w as m e a rs u re d for 30 tim es, th e following photopeaks
in keV were found in th e p h o to n u clea r reactions for T i 0 2 (Table 1)
T a b l e 1 The p h o to p eak s in p h o to n u clear reactio n s for T i 0 2
counts
NET, counts Error, ± CENTROID,
keV
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aglM J JX[ Ari "tzLÓdi I fuS A I i ' Ĩ
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1 3 /0 1 /2 0 0 3 FlMt 3 7 7 6 1 BB
L b*m 36 00(100
D ««ct 4 6 7 «
- no I— "
f*— - — I
j j S U i
r - P m I c -“1
*.1 _!r*sJ jg jj
.Mi)
f jl E G Ị Q O R T C C I
1 0 2 4 4 8
L w * d 0 » 0 1 / 2 0 0 4 I
w rL i.,
Fig 2 G a m m a sp e c tru m of 44Sc m ea su re d by G am m av isio n S p ectro m eter
2 R e s u lt s a n d d i s c u s s i o n
A fter a n a l y s i n g all th e m e a rsu re d sp ectra an d co m p arin g the analysised
d a ta w ith th e d a t a of ra d io isotopes, th e following rea ctio n s w ere found:
Trang 432 Nguyen T rung T inh
Ti(y,n) {for T i46}
Ti(y,2n) { for T i47}
ti(y,p) { for T i47, T i48, Ti49, Ti50}-> Sc
fi(y,2p) { for T i49} -> C a 47
fi(Y,pn) { for T i46, T i48, Ti49, T i50} -> Sc
fi(y ,ap ) { for Ti47, T i48, Ti49, Ti50} -> K
The d a ta is su ita b le w ith th e reference d a ta
This r e s u lt can be u se d for:
N u c lea r d a ta (Cross-section)
N u c lea r s tr u c tu r e
N u c lea r a n a ly sis
R adioisotope production
R e f e r e n c e s
1 Boston M., E r d u r a n M N ,S irin M a n d S u b a s t M., P hysical Review, 2,
(1997).
2 Kolev D., A ppl R a d ia ti Isot, 8, (1998).
3 Kolev D., Dobva E., Nenov N a n d Todorov V., N u c le a r in stru m e n ts a n d
m ethods in p h y sic reseach, 356, (1995).
4 A dnan A S h ih ab -E ld in , L eslie J J a r d i n e , J a g d is h K.Tuli, A ndrey
B.Buyrn Table o f Isotopes, U n iv e rs ity of C alifornia, Berkele, 1978.