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

DOE-STD-1128-98

Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities

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-04

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

18250

0.00E+00

1.00E-06

3.70E-03

4.38E-07

4.39E-07

(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 an 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 an in the body, rather than intake (which includes material not

retained and of no dosimetric significance). These methods were (and are) dosimetrically

sound in an 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):

H 50 =

I*DCF

(5.8)

5-32