To meet fully the needs of radiation protection, a dosimetric model for the respiratory tract should: provide calculations of doses for individual members of the populations of all ethnic groups, in addition to workers; be useful for predictive and assessment purposes as well as for deriving limits on intakes; account for the influence of smoking, air pollutants, and respiratory tract diseases; provide for estimates of respiratory tract tissue doses from bioassay data; and be equally applicable to radioactive gases as well as to particles.
Addressing all of these requirements has resulted in a dosimetry model that is more complex than previous models.
Usually, doses from intakes of radionuclides are low compared with the relevant limit or constraint, and the resulting difference is unimportant.
There are, however, circumstances where more reliable assessments of intake and dose are desirable.
ICRP 24 (1-3), 1994Abstract - This report describes a revision of the model used in ICRP Publication 30 to calculate radiation doses to the respiratory tract of workers resulting from the intake of airborne radionuclides.
In any particular situation the actual values of many parameters can be considerably different from the reference values.
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ICRP 32 (1-2), 2002Abstract - The ICRP Publication 66 Human Respiratory Tract Model for Radiological Protection (HRTM) has been applied to calculate dose coefficients (doses per unit intake) and bioassay functions in ICRP Publications 68, 71, 72 and 78.
For these purposes, ICRP assigned numerical values to a range of model parameters, such as the size of the inhaled particles and the breathing rate of the subjects.