VNU. 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
30 N gu yen Trung Tinh
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 Number, ROI-RANGE( keV) GROSS,
counts
NET, counts Error, ± CENTROID, keV
1 46.40 62.92 1853597 352091 2758 54.54
2 70.70 79.44 836728 7125 1343 74.28
3 95.48 104.23 1161559 44717 1569 99.61
4 137.27 146.02 1477632 29363 1779 141.73
5 149.91 164.00 15936873 13850248 4711 159.63
6 166.91 180.03 1347746 232305 2079 175.53
7 216.96 225.71 686634 3128 1218 221.27
8 267.01 275.75 697042 67160 1196 271.63
9 314.62 323.37 718894 2952 1246 318.70
10 369.04 377.78 432011 86794 913 373.21
11 392.84 401.59 270861 8430 759 397.36
12 473.48 482.23 208231 8569 664 478.07
13 491.45 496.80 160825 1027 401 494.88
14 507.00 515.74 7242364 6018612 2944 511.51
15 560.43 569.17 107409 4489 476 564.57
16 589.57 598.31 108647 5395 478 593.85
17 613.37 622.11 141882 36673 514 618.00
18 716.33 725.07 113340 4749 489 720.71
19 885.32 894.06 159307 70925 512 889.69
20 904.74 913.48 88875 3837 433 909.45
21 930.47 939.21 103112 19743 447 934.85
22 979.51 988.25 496129 416443 767 984.03
23 1017.86 1026.60 54845 1316 342 1021.97
24 1033.89 1042.62 454850 390940 727 1038.08
25 1080.00 1088.74 41880 -202 301 1084.55
26 1117.87 1124.66 83062 53787 312 1121.08
S e a rc h in g fo r P h o to n u c le a r R e a ctio n on.. 31
27 1127.09 1133.40 28262 6196 188 1129.73
28 1152.82 1161.56 539954 486770 775 1157.46
29 1209.12 1217.86 20262 8846 183 1213.27
30 1293.09 1299.89 10202 517 122 1297.20
31 1301.83 1319.78 370635 349260 680 1312.37
32 1364.43 1373.17 4912 425 100 1369.11
33 1404.23 1412.96 5664 1471 102 1409.03
34 1456.64 1465.37 4685 1056 94 1460.99
35 1467.80 1474.59 2869 189 64 1471.00
36 1483.32 1492.06 3535 321 85 1487.70
37 1494.97 1503.70 6675 3502 101 1499.64
38 1520.20 1528.93 11990 9054 124 1524.79
39 1657.02 1671.09 8504 3684 151 1667.61
40 1726.40 1734.16 1216 40 46 1730.97
41 1739.01 1748.71 1484 42 60 1746.28
42 1761.81 1767.14 916 96 30 1763.98
43 1803.52 1813.23 1835 375 63 1807.69
44 1842.81 1850.58 1076 87 43 1846.88
45 1956.31 1964.07 1535 178 51 1960.68
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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:
32 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.
