products, and transuranium radionuclides that often should be among the most important in estimating inhalation doses at various times after a detonation. Not included in the tables is 131I, for which the dose coefficient for the thyroid currently recommended by ICRP (1994a) is about a factor of 2 less than the value used in dose reconstructions, and 137Cs, for which the current dose coefficients for all organs and tissues are slightly lower than the values used in dose reconstructions. The data in these tables illustrate that doses per unit activity inhaled tend to be substantially higher for longer-lived radionuclides than for shorter-lived radionuclides (see Section V.C.1).

The data in Tables V.C.1 and V.C.2 indicate that dose coefficients for inhalation of radionuclides attached to respirable particles (AMAD, 1 μm) used in the NTPR program tend to be higher than values for the same particle size currently recommended by ICRP. That is the case especially for the lung and respiratory lymphatic tissues, but for some radionuclides substantial differences are also

TABLE V.C.1 Comparison of Dose Coefficients for Inhalation of Radionuclides in Respirable Form (AMAD, 1 μm) Used in NTPR Program with Values for Same Particle Size Currently Recommended by ICRP: I. Shorter-Lived Radionuclides

 

Dose coefficient (rem μCi−1)a

Nuclideb

Lungc

Lymph tissued

Large intestinee

Red bone marrow

Bone surfaces

Liver

Bladder Wall

24Na

4.6E-3

2.5E-2

3.8E-4

1.0E-3

1.2E-3

8.1E-4

5.3E-4

(15.0 h)

(5.2E-4)

(4.1E-4)

(4.4E-4)

(5.6E-4)

(7.8E-4)

(3.7E-4)

(5.6E-4)

56Mn

2.0E-3f

 

3.8E-5f

3.0E-5f

 

(2.6 h)

(1.3E-3)

(8.5E-5)

(3.7E-4)

(3.7E-5)

(3.0E-5)

(4.1E-5)

(2.2E-5)

91Sr

4.3E-3

2.9E-2

2.6E-3

4.1E-4

4.4E-4

4.1E-4

2.6E-4

(9.6 h)

(1.9E-4)

(9.6E-5)

(1.9E-3)

(4.8E-4)

(5.2E-4)

(9.6E-5)

(5.6E-4)

93Y

1.4E-2

1.4E-2

6.4E-3

1.1E-4

1.7E-4

2.3E-4

1.4E-5

(10.2 h)

(5.6E-3)

(1.9E-5)

(7.0E-3)

(6.7E-6)

(4.8E-6)

(6.3E-6)

(5.6E-6)

97Zr

2.1E-2

2.2E-2

1.6E-2

4.0E-4

3.8E-4

3.9E-4

2.4E-4

(16.7 h)

(1.2E-2)

(4.8E-4)

(1.4E-2)

(2.9E-4)

(2.4E-4)

(1.6E-4)

(1.8E-4)

143Ce

1.6E-2

1.9E-2

1.6E-2

1.2E-4

7.7E-5

2.0E-4

7.6E-5

(33.0 h)

(1.5E-2)

(2.5E-4)

(9.3E-3)

(1.6E-4)

(1.9E-4)

(6.3E-4)

(5.6E-5)

239Np

1.0E-2

1.9E-2

1.2E-2

1.8E-4

9.1E-4

2.9E-4

7.3E-5

(2.4 d)

(2.2E-2)

(2.9E-4)

(7.0E-3)

(1.7E-4)

(1.9E-3)

(1.2E-4)

(7.8E-5)

aFirst entry is value from Table 5a of Egbert et al. (1985) based on ORNL reports (Killough et al., 1978a; Dunning et al., 1979) and often used in dose reconstructions for atomic veterans, except as noted; values are based on dosimetric and biokinetic models in ICRP Publication 30 (ICRP, 1979a). Second entry, in parentheses, is value for AMAD of 1 μm currently recommended for adult workers by ICRP (2002). All values apply to radionuclides in oxide form (Eckerman et al., 1988).

bEntry in parentheses is radionuclide half-life.

cDose coefficients for lung are calculated as described in Section V.C.3.1, comment [7].

dLymphatic tissues that drain bronchial and pulmonary regions of lung.

eWall of lower large intestine.

fValue from Eckerman et al. (1988).



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement