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Dynamic behavior of 110mAg in sheep tissues
N A Beresford1, R W Mayes, N M Crout
1Institute of Terrestrial Ecology, Merlewood Research Station, Grange-over-Sands, Cumbria, UK.
Health Physics
|April 1, 1994
Summary
This study quantifies silver-110m (110mAg) transfer and retention in sheep tissues. The liver is the primary deposition site, with implications for estimating silver transfer in food animals.
Area of Science:
- Environmental Science
- Radiochemistry
- Animal Physiology
Background:
- Accurate data on radiometal transfer in livestock is crucial for food safety assessments.
- Silver-110m (110mAg) is a radioisotope of concern for potential environmental contamination.
- Understanding tissue deposition and retention is key to predicting internal radiation doses.
Purpose of the Study:
- To determine the transfer coefficient of 110mAg to various sheep tissues.
- To establish the biological half-life of 110mAg in different sheep tissues.
- To refine models for predicting 110mAg transfer to food-producing animals.
Main Methods:
- Administration of 110mAg to sheep.
- Measurement of 110mAg concentrations in multiple tissue types over time.
- Calculation of transfer coefficients and biological half-lives.
Main Results:
- The liver exhibited the highest 110mAg deposition and retention.
- A transfer coefficient of 7.1 d kg-1 and a biological half-life of 79 d were determined for liver.
- Previous estimates for silver transfer to muscle may be overestimated.
Conclusions:
- The liver is the principal organ for 110mAg accumulation in sheep.
- Accurate data on 110mAg kinetics in sheep are essential for risk assessment.
- Further research is needed to validate silver transfer estimates in muscle tissue.