Table 5.6. Intake Retention Fractions(a) for 239Pu

DOE-STD-1128-98

Table 5.6. Intake Retention Fractions(a) for 239Pu

Class W

Class Y

Days Post-

Intake

Lung

Urine

Feces

Lung

Urine

Feces .

2.16E-01

2.36E-04

1.05E-01

2.14E-01

1.28E-05

1.27E-01

1.78E-01

1.61E-04

1.34E-01

1.81E-01

8.71E-06

1.56E-01

1.39E-01

3.29E-05

6.41E-03

1.50E-01

1.69E-06

5.20E-03

1.26E-01

2.18E-05

1.23E-03

1.48E-01

1.09E-06

1.73E-04

1.03E-01

1.73E-05

9.58E-04

1.45E-01

8.60E-07

1.34E-04

7.01E-02

1.34E-05

6.34E-04

1.41E-01

7.15E-07

1.29E-04

4.77E-02

1.15E-05

4.21E-04

1.37E-01

6.89E-07

1.23E-04

180

1.50E-02

8.31E-06

1.26E-04

1.25E-01

7.19E-07

1.09E-05

365

1.36E-03

4.84E-06

1.39E-05

1.04E-01

7.97E-07

8.46E-05

730

1.09E-05

2.45E-06

2.50E-06

7.31E-02

8.85E-07

5.14E-05

1825

0.00E+00

1.63E-06

2.90E-02

8.82E-07

1.19E-05

3650

0.00E+00

1.54E-06

9.60E-03

7.38E-07

1.36E-06

7300

0.00E+00

1.38E-06

4.16E-03

6.09E-07

6.15E-07

0.00E+00

1.00E-06

3.70E-03

4.38E-07

4.39E-07

18250

(a) Calculated using GENMOD Computer Code Version 3.0.3(2), assuming 1-m AMAD aerosol.

5.8.2

Alternate Methods of Intake Assessment

Historically, intake as described in the foregoing section was not always calculated

when assessing plutonium exposures. Estimates of uptake using methods similar to

Langham (1956), Healy (1957), or Lawrence (1987) focused on assessing the

magnitude of radioactivity retained in the body, rather than intake (which includes

material not retained and of no dosimetric significance). These methods were (and

are) dosimetrically sound in so far as estimates of deposition and uptake are

concerned, but do not meet the current regulatory requirement of 10 CFR 835 (DOE,

1998a) to calculate intake.

5.8.3

Estimating Effective Dose Equivalent from Intakes of Plutonium

The committed dose equivalent resulting from an intake of plutonium may be

calculated by multiplying the estimated intake (I) by an appropriate dose conversion

factor (DCF):

H50 =

I * DCF

(5.8)

5-32