Table 5.4. Example Plutonium Isotope Mixtures Immediately Post-Separation wt%

DOE-STD-1128-98

Table 5.4. Example Plutonium Isotope Mixtures Immediately Post-Separation wt%

Weapons-Grade

Fuels-Grade

Spent Commercial

Plutonium

Fuel

Isotope

(6% 240Pu Mixture)

(12% 240Pu Mixture)

(25% 240Pu Mixture)

238Pu

0.05

0.10

1.49

239Pu

93.0

84.4

59.50

240Pu

6.1

12.4

23.98

241Pu

0.8

3.0

10.33

242Pu

0.05

0.1

4.0

240Am

0.0

Table 5.5. Activity Composition with Age for Reference 6% and 12% 240Pu Mixtures

Reference 12% Pu Mix (a)

Reference 6 % Pu Mix (a)

Isotopic

Component

Fresh

Aged

Fresh

Aged

Specific Activity

In Mixture, Ci/g

238Pu

8.6E-3

1.7E-2

1.6E-2

239+240Pu

7.2E-2

8.0E-2

241Pu

8.2E-1

3.1E+0

2.4E+0

242Pu

2.0E-6

3.9E-6

241Am

5.3E-5

5.8E-3

2.0E-4

2.2E-2

Pu-alpha

8.1E-2

9.7E-2

9.6E-2

Total alpha

8.1E-2

9.7E-2

1.2E-2

Activity Ratios

Pu:241Am

1.2E+3

1.2E+1

4.1E+2

3.7E+0

239+240

Pu-alpha:241Am

1.5E+3

1.4E+1

4.9E+2

4.4E+0

241Pu:239+240Pu

1.2E+1

9.1E+1

3.8E+1

3.0E+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:

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