TABLE V.C.2 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: II. Longer-Lived Radionuclides

 

Dose coefficient (rem μCi−1)a

Nuclideb

Lungc

Lymph tissued

Large intestinee

Red bone marrow

Bone surfaces

Liver

Bladder Wall

60Co

1.3

1.2E1

2.9E-2

6.4E-2

5.1E-2

1.2E-1

1.1E-2

(5.3 y)

(6.3E-1)

(5.9E-1)

(1.7E-2)

(4.4E-2)

(3.3E-2)

(7.0E-2)

(4.4E-3)

89Sr

6.6E-3

7.6E-2

1.4E-2

1.3E-2

2.7E-2

2.2E-3

1.1E-3

(50.5 d)

(7.4E-4)

(6.7E-4)

(1.4E-2)

(1.6E-2)

(2.0E-2)

(6.7E-4)

(2.3E-3)

90Sr

9.9E-3

1.4E-1

1.4E-2

1.1

2.2

1.5E-2

7.3E-3

(28.8 y)

(2.3E-3)

(2.2E-3)

(1.9E-2)

(5.9E-1)

(1.4)

(2.2E-3)

(4.8E-3)

95Zr

6.9E-2

2.3E-1

1.6E-2

5.5E-3

7.8E-3

4.7E-3

1.6E-3

(64.0 d)

(1.1E-1)

(1.9E-2)

(8.9E-3)

(8.5E-3)

(4.4E-2)

(3.6E-3)

(4.1E-4)

106Ru

3.8

3.4E1

1.4E-1

9.4E-3

1.0E-2

1.2E-2

3.9E-3

(373 d)

(1.9)

(3.5E-1)

(7.8E-2)

(3.6E-3)

(3.1E-3)

(4.4E-3)

(2.3E-3)

144Ce

2.9

2.2E1

1.3E-1

9.0E-3

1.5E-2

8.1E-2

2.9E-4

(285 d)

(1.4)

(2.1E-1)

(7.0E-2)

(4.1E-3)

(7.0E-3)

(2.0E-2)

(2.7E-4)

152Eu

2.7

6.1E1

5.6E-2

1.3E-1

2.0E-1

9.8E-1

1.4E-2

(13.5 y)

(2.1E-1)

(1.2E-1)

(5.6E-2)

(2.4E-1)

(6.7E-1)

(9.6E-1)

(2.3E-2)

239Puf

5.8E2

4.1E4

1.1E-1

3.0E2

4.2E3

8.0E2

2.9

 

(2.9E2)

(3.0E3)

(1.1)

(3.1E1)

(6.3E2)

(1.3E2)

(1.1)

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; 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.

fDose coefficients apply to any mixtures of 239Pu and 240Pu, which have half-lives of 24,100 and 6,560 y, respectively.

found for other organs and tissues. In some cases, however, the ICRP’s current dose coefficient is substantially higher than the value used in the NTPR program. The increase by a factor of 10 for plutonium and the lower large intestine wall is discussed in Section V.C.3.2, comment [3].

Differences in dose coefficients for the lung shown in Tables V.C.1 and V.C.2 are due to a number of factors, including: substantial differences in dose coefficients for respiratory lymphatic tissues combined with a change in how the dose to these tissues is incorporated into the dose to the lung (see comment [7] in this section); differences in dosimetric models for radiosensitive tissues in airways of the respiratory tract; differences in assumptions about deposition fractions of inhaled 1-μm particles in different regions of the respiratory tract, includ



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