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Page Title:
Table 5.4. Example Plutonium Isotope Mixtures Immediately Post-Separation, wt% |
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| 0132im.jpg) DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
Table 5.4. Example Plutonium Isotope Mixtures Immediately Post-Separation, wt%
Fuels-Grade
Spent Commercial
Weapons-Grade
Plutonium
Fuel
Plutonium
(6% 240Pu Mixture)
(12% 240Pu Mixture)
(25% 240Pu Mixture)
Isotope
238
Pu
0.05
0.10
1.49
239
Pu
93.0
84.4
59.50
240
Pu
6.1
12.4
23.98
241
Pu
0.8
3.0
10.33
242
Pu
0.05
0.1
4.0
241
Am
0.0
0.0
0.0
Table 5.5.
Reference 6% Pu Mix(a)
Reference 12% Pu Mix(a)
Isotopic
Component
Fresh
Aged
Fresh
Aged
Specific Activity in
Mixture, Ci/g
238
1.6E-2
1.7E-2
8.2E-3
8.6E-3
Pu
239+240
8.0E-2
8.0E-2
7.2E-2
7.2E-2
Pu
241
2.4E+0
3.1E+0
8.2E-1
8.2E-1
Pu
242
3.9E-6
3.9E-6
2.0E-6
2.0E-6
Pu
241
2.2E-2
2.0E-4
5.8E-3
5.3E-5
Am
9.6E-2
9.7E-2
8.1E-2
8.1E-2
Pu-alpha
1.2E-2
9.7E-2
8.1E-2
8.1E-2
Total alpha
Activity Ratios
239+240
Pu:241Am
3.7E+0
4.1E+2
1.2E+1
1.2E+3
Pu-alpha:241Am
4.4E+0
4.9E+2
1.4E+1
1.5E+3
241
Pu:239+240Pu
3.0E+1
3.8E+1
9.1E+1
1.2E+1
(a) % = nominal 240Pu weight percent in mixtures.
Fresh = 2 weeks of 241Am ingrowth following separation.
Aged = 5 years of 241Am ingrowth following separation.
5.3.1 Classification of Bioassay Measurements
Bioassay measurements can be classified according to the primary reason for their
performance. This is a useful practice for historically documenting why a worker
participated in a bioassay program. Numerous reasons for bioassay measurements may be
defined for specific facilities; some suggested common classifications are as follows:
5-10
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