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Modifying the ICRP 66 dosimetry model based on results obtained from Mayak plutonium workers
S A Romanov1, R A Guilmette, F F Hahn
1Southern Urals Biophysics Institute, Ozyorsk Road, 19, Ozyorsk, Chelyabinsk Region, 456780, Russia. roma@telecom.ozersk.ru
Radiation Protection Dosimetry
|October 7, 2003
Summary
Plutonium retention in the lungs of Mayak workers was higher than current models predict. The study modified the Human Respiratory Tract Model (HRTM) to better represent long-term plutonium (Pu) lung burdens.
Area of Science:
- Occupational health
- Radiological protection
- Dosimetry modeling
Background:
- Mayak Production Association workers exposed to plutonium (Pu) show higher long-term lung retention than predicted.
- The International Commission on Radiological Protection (ICRP) 66 Human Respiratory Tract Model (HRTM) requires refinement for accurate Pu dosimetry.
Purpose of the Study:
- To improve the HRTM for better prediction of long-term plutonium retention in the lungs.
- To incorporate workplace-specific aerosol characteristics into the dosimetry model.
Main Methods:
- Microscopic distribution analysis of plutonium in deceased workers' lungs.
- Modification of HRTM parameters: transfer rate from the transformed state and transfer fraction to the bound state.
- Inclusion of a 'bound state' compartment in the HRTM.
Main Results:
- The modified HRTM provides a better representation of long-term Pu retention.
- The model successfully describes workplace-specific Pu aerosol characteristics.
- Pu nitrate aerosols exhibit significantly greater long-term lung retention than the default Type M.
Conclusions:
- The revised HRTM enhances the accuracy of plutonium dosimetry for occupationally exposed individuals.
- The model's ability to incorporate aerosol-specific data improves risk assessment for Mayak workers.
- Findings highlight the need to consider specific aerosol properties in respiratory tract models.