TABLE B.25
OBSERVED BETA-DECAY RATES
Beta counting samples, supported and covered by 0.80 mg/cm’of pliofilm, were prepared on the
YAG 40 from aliquots of SIC tray stock solution. Measurements initiated there were usually continued on Site Elmer, and terminated at NRDL. When stock solution activity permitted, a portion
was shipped to NRDL as soon as possible, allowing simultaneous field and NRDL decay measurements to be obtained. Nominally identical continuous-flow proportional detectors were installed
at all three locations, and small response differences were normalized by Cs'*" reference standards. No scattering or absorption corrections have been madeto the observed counts.
Counter
Age
Activity
Counter
Age
Activity
Location
Location
counts/sec
counts/sec
hr
10‘ fissions
hr
104 fissions
Shot
Flathead,
YAG 40
Sample
127.4
24.0
" 99.42
49.8
49.97
19.5
21.7
27.9
31.1
34.1
36.6
41.1
45.0
Site Elmer
3473/8, 3.09 x 108 fission,
16.4
54.1
57.9
62.0
65.6
69.6
73.8
15.5
78.8
85.0
90.1
96.5
103.7
109.3
99.42
x 1074
Shelf l
Site Elmer
22.83
136.6
17.84
194.8
11.49
123.8
130.9
80.06
72.70
67.77
63.35
57.69
53.26
44.22
40.97
38.68
36.47
34.38
34.21
32.87
30.66
29.26
27.90
26.24
24.19
112.3
153.4
161.5
175.0
194.2
224.1
247.8
NRDL
x07!
215
261
333
429
501
598
723
891
1,034
1,223
1,417
1,582
20.07
18.66
x107
15.33
14.69
13.02
11.49
9.412
8.339
10.18
7.718
5.389
3.586
2.875
2.226
1.692
1.226
0.9812
0.7773
0.5916
0.5194
x 1074
Shot Navajo, Sample P-3753/8 #2, 7.2410" fission, Shelf 3.
YAG 40
12.62
15.58
18.24
20.33
23.76
26.90
29.78
34.51
38.0
47.9
7.428 =< 107?
5.801
4.933
4.386
3.701
3.276
2.950
2.495
2.262
1,748
Site Elmer
67.8
1.157 x 1073
87.0
89.9
99.0
8.640 x 1074
8.262
7.363
YAG 40
122.9
150.0
310.6
226.1
278.5
NRDL
478
74.8
574
647
593
742
814
361
912
NRDL
984
1,030
1,080
1,151
1,198
1,246
1,342
1,450
1,485
1,534
4.196 x 1075
3.906
3.731
3.223
3.269
3.128
2.620
2.647
2.477
2.373
1,780
2.040
5.691 x 107
4.448
3.736
2.597
1.973
2,014
2,164
2,374
2,541
2,666
2,834
3,266
3,500
3,914
1.710
1.535
1.425
1,293
1.252
1.077
9.346 x 107
8.678
7.413
1.011 x 1074
4,320
8.308
5,930
6,580
6,740
8,230
8,640
4.857
4.005
3.752
3.453
3.039
2.440
1.027
1,850
1.937
x 1078
6.878
4,750
5,330
6436
5.904
5.359
4.968
4.733
257
1.883
5-617