Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
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DRAFT REPORT FOR CONSULTATION<br />
individual-related factors.<br />
The total number <strong>of</strong> nuclear transformations (radioactive decays) occurring<br />
within a defined time period in each source region is calculated<br />
The dosimetric models based on reference computational phantoms and Monte<br />
Carlo radiation transport codes are used to calculate the mean absorbed dose to<br />
each target organ or tissue resulting from a nuclear disintegration in each<br />
source organ.<br />
The radiation weighting factors are applied to determine sex-specific<br />
committed equivalent doses.<br />
The tissue weighting factors are then applied to determine the sex-averaged<br />
committed effective dose.<br />
Quantified intake by<br />
inhalation or ingestion<br />
Mean absorbed dose, DT,R<br />
in an organ or tissue<br />
Equivalent dose, HT,<br />
in an organ or tissue<br />
Effective dose, E<br />
Figure 1. Calculation <strong>of</strong> absorbed dose and the <strong>ICRP</strong> protection quantities, equivalent and<br />
effective dose, for intakes <strong>of</strong> radionuclides<br />
(21) The detailed computational procedure used in this report series is described in<br />
section 3.7.<br />
1.3 Previous reports on occupational intakes <strong>of</strong> radionuclides<br />
(22) Publication 30 (<strong>ICRP</strong>, 1979, 1980, 1981, 1988b) and its Supplements gave<br />
dose coefficients and values <strong>of</strong> Annual Limits on Intake (ALI) for workers, for intakes<br />
<strong>of</strong> radionuclides by inhalation and ingestion, referencing the recommendations issued<br />
in Publication 26 (<strong>ICRP</strong>, 1977) and the anatomical and physiological data in<br />
Reference Man (<strong>ICRP</strong>, 1975). Publication 68 (<strong>ICRP</strong>, 1994b) provided updated dose<br />
coefficients for workers following the 1990 Recommendations issued in Publication<br />
60 (<strong>ICRP</strong>, 1991). It applied the Publication 66 HRTM (<strong>ICRP</strong>, 1994a) for inhaled<br />
radionuclides, the updated basic anatomical and physiological data for the skeleton in<br />
28<br />
Biokinetic and Dosimetric<br />
Models<br />
Radiation weighting<br />
factors, w R<br />
Tissue weighting<br />
factors, w T
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