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Table 1
Operating voltage 4*150 = 450 volt
Obs.
No.
For source Co60
count/30 sec
For source Sr90
count/30 sec
For Co60+Sr90
count/30 sec
1
242
244
572
2
240
256
624
3
221
223
565
4
230
240
594
5
228
246
580
6
239
252
595
7
239
232
552
8
254
264
619
9
249
251
557
10
251
265
605
11
259
253
581
12
271
265
555
13
237
265
572
14
227
253
597
15
252
218
582
16
248
247
600
17
255
249
587
18
258
238
590
19
256
245
602
20
281
265
602
Mean count for Co60
𝑁𝑖=4937
𝑁
̅=4937
20 =246.85
Mean count for Sr90
𝑁𝑖=4971
𝑁
̅=4971
20
=248.55
Mean count for
Co60+Sr90
𝑁𝑖= 11731
𝑁
̅=11731
20 = 586.55
Table 2
Obs. No.
Ni for Co60
count/30sec
𝑁𝑖𝑁
̅
1
242
-4.85
2
240
-6.85
3
221
-25.85
4
230
-16.85
5
228
-18.85
6
239
-7.85
7
239
-7.85
8
254
7.15
9
249
2.15
10
251
4.15
11
259
12.15
12
271
24.15
13
237
-9.85
14
227
-19.85
15
252
5.15
16
248
1.15
17
255
8.15
18
258
11.15
19
256
9.15
20
281
34.15

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