TABLE V.C.6 Estimated Reliability of Effective Dose Coefficients for Selected Radionuclides, Relative to Values Recommended in ICRP Publication 30a

Radionuclide

Route of Intakeb

Uncertainty Factorc

High reliability

3H (HTO)

Ingestion

2

14C (CO2)

Inhalation

2

137Cs

Inhalation or ingestion

2

90Sr

Inhalation or ingestion

3

131I

Inhalation or ingestion

3

140La

Ingestion

3

Intermediate reliability

 

 

140La, 210Pb

Inhalation

5

14C (CO2)

Ingestion

5

60Co, 144Ce

Inhalation

5

210Pb, 230Th

Inhalation

5

234U

Inhalation

5

55Fe, 95Nb

Inhalation or ingestion

5

140Ba, 226Ra

Inhalation or ingestion

5

Low reliability

 

 

210Po

Ingestion

10

60Co, 210Pb

Ingestion

10

230Th, 234U

Ingestion

10

95Zr, 106Ru

Inhalation or ingestion

10

125Sb

Inhalation or ingestion

10

237Np, 239Pu

Inhalation or ingestion

10

241Am, 244Cm

Inhalation or ingestion

10

144Ce

Ingestion

10

aEstimates given by Bouville et al. (1994) and NCRP (1998). Effective dose is weighted average of equivalent doses to different organs and tissues (ICRP, 1991a).

bInhaled materials are assumed to be attached to respirable particles (AMAD, 1 μm), except that 3H (HTO) and 14C (CO2) are assumed to be in vapor and gaseous form, respectively.

cRatio of the upper limit of a 90% confidence interval of a subjective probability distribution of the effective dose per unit activity intake by healthy adult males to the effective dose coefficient recommended by ICRP; that is, the 95th percentile of an assumed probability distribution exceeds ICRP’s recommended value by the uncertainty factor (see Section V.C.3.2, comment [1]).

[2] Dose coefficients for inhalation of alpha-emitting radionuclides, such as plutonium, used in dose reconstructions incorporate an assumption that the biological effectiveness of alpha particles is 20 times that of photons and electrons, without uncertainty. However, a credible upper-bound estimate of the biological effectiveness of alpha particles is substantially higher than the assumed value.

Dose coefficients for inhalation of alpha-emitting radionuclides used in dose reconstructions incorporate a standard assumption recommended by ICRP (1977;



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