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A physiologically based biokinetic model for cesium in the human body
R W Leggett1, L R Williams, D R Melo
1Oak Ridge National Laboratory, 1060 Commerce Park, Oak Ridge, TN 37831, USA. rwl@ornl.gov
The Science of the Total Environment
|November 25, 2003
Summary
This study developed a detailed model of cesium (Cs) behavior in the human body, integrating blood flow and tissue interactions. The model accurately predicts radiocesium distribution and retention over time.
Area of Science:
- Physiological modeling
- Toxicology
- Human metabolism
Background:
- Cesium (Cs) is a biologically active element with known analogues like potassium (K) and rubidium (Rb).
- Understanding Cs distribution and retention in the human body is crucial for risk assessment and medical management.
Purpose of the Study:
- To construct a physiologically descriptive model of cesium's biological behavior in the human body.
- To accurately predict the time-dependent distribution and retention of radiocesium.
Main Methods:
- Developed a detailed blood flow model to simulate Cs transfer between plasma and tissues.
- Incorporated tissue-specific extraction fractions and equilibrium data from environmental studies.
- Accounted for non-exchange transfers, such as gastrointestinal secretions, using physiological data.
Main Results:
- Model predictions align with existing experimental data on radiocesium distribution and retention.
- The model successfully integrates blood perfusion, tissue extraction, and return rates.
- It accounts for physiological factors influencing Cs kinetics beyond simple plasma-tissue exchange.
Conclusions:
- The developed model provides a robust framework for understanding cesium's biological behavior.
- It accurately simulates radiocesium dynamics in the human body.
- This model can aid in assessing human exposure and developing mitigation strategies.