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- Title
The Revised International Commission on Radiological Protection (ICRP) Dosimetric Model for the Human Respiratory Tract—An Overview.
- Authors
Bair, W. J.
- Abstract
A proposed revision of the dosimetric model of the respiratory tract used in ICRP Publication 30 (ICRP, 1979) provides for the inhalability of airborne materials and describes deposition in specific extrathoracic and thoracic regions. Clearance is competitive between particle transport processes and absorption into blood. Reference values for particle transport rates are provided. In the absence of observations on specific radionuclide compounds, default values for rate of absorption into blood are proposed for materials classified as being rapidly, moderately, or slowly absorbed. The calculation of doses follows the method of ICRP 30 (ICRP, 1979), in which the committed equivalent dose in a target tissue is determined by the energy absorbed per unit mass. However, instead of calculating an average dose to the total lungs, the new model provides for calculating doses to specific tissues of extrathoracic and thoracic airways, and then adjusting these doses to account for differences in radiation sensitivity. These detriment-adjusted doses can be summed separately for the extrathoracic and the thoracic regions yielding two values of equivalent dose for the entire respiratory tract which can be used in the ICRP dosimetric system (ICRP, 1991).
- Publication
Annals of Occupational Hygiene, 1994, Vol 38, p251
- ISSN
0003-4878
- Publication type
Article