Updating the icrp human respiratory tract model single parent dating cottonwood idaho

The ICRP Task Group on Internal Dosimetry is developing new Occupational Intakes of Radionuclides (OIR) documents.

Application of the Human Respiratory Tract Model (HRTM) requires a review of the lung-to-blood absorption characteristics of inhaled compounds of importance in radiological protection.

The review of absorption rates provides a database of parameter values from which consideration can be given to deriving typical values for default Types F, M and S materials, and element-specific rapid dissolution rates.

updating the icrp human respiratory tract model-88

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.

This revision was motivated by the availability of increased knowledge of the anatomy and physiology of the respiratory tract and of the deposition, clearance, and biological effects of inhaled radioactive particles, and by greatly expanded dosimetry requirements.

The others deal with the derivation of HRTM absorption parameter values from experimental data, and their application, with additional information on e.g.

size distribution, to calculate dose coefficients and interpret bioassay data. Guide for the Practical Application of the ICRP Human Respiratory Tract Model.

Issues specific to radioactive aerosols, such as low particle number concentrations for high specific activity materials are, however, addressed.

Guidance on obtaining information about absorption of inhaled radionuclides into blood is given in greater detail, because this is a topic on which ICRP has traditionally given guidance, and because a compilation of such information is not readily available elsewhere. One involves assessment of an individuals intake and committed dose from comprehensive bioassay monitoring data.

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. Human Respiratory Tract Model for Radiological Protection.

This Guidance Document therefore gives advice on applying specific information within the framework of the HRTM for assessing occupational and environmental exposures and for interpreting bioassay data.

Chapters on each aspect of the model (morphometry, physiology, deposition, clearance, gases and vapours, dosimetry) provide: - A summary of how the HRTM treats that topic; - Information on the reference values of relevant parameters; - Guidance on choosing between default values; - Information on how doses and bioassay quantities (lung retention, urine, and faecal excretion) vary with the values of selected parameters, giving guidance on the importance of obtaining specific information; - Simple examples of the use of specific information relating to the topic.

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.

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