The long-term decrease of 90Sr availability in the environment and its transfer to man after a nuclear fallout

Due to its long physical half-life, and the fact that its long-term mobility in the environment as well as its radiotoxicity is higher than that of 137Cs, the long-term bio-availability of 90Sr in the environment is of importance with regard to the long-term population exposure after fallout from nu...

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Bibliographic Details
Published in:Radiation protection dosimetry 2001, Vol.94 (3), p.251-259
Main Authors: MÜCK, K, SINOJMERI, M, WHILIDAL, H, STEGER, F
Format: Article
Language:English
Subjects:
Air Pollutants, Radioactive - analysis
Air Pollution, Radioactive - analysis
Austria
Biological and medical sciences
Biological effects of radiation
Cesium - analysis
Follow-Up Studies
Food Contamination - analysis
Fundamental and applied biological sciences. Psychology
Half-Life
Radiation Monitoring
Radioactive Fallout
Radioactive Hazard Release
Radiocontamination
Risk Assessment
Soil Pollutants, Radioactive - analysis
Strontium - analysis
Time Factors
Tissues, organs and organisms biophysics
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Summary:Due to its long physical half-life, and the fact that its long-term mobility in the environment as well as its radiotoxicity is higher than that of 137Cs, the long-term bio-availability of 90Sr in the environment is of importance with regard to the long-term population exposure after fallout from nuclear weapons detonations or a severe reactor accident. It will also substantially influence the time-span required until re-utilisation of highly contaminated territory is possible again. An assessment of the long-term decrease of the activity concentration in all foodstuffs relevant for internal exposure after severe 90Sr fallout was performed. The observed effective half-lives were approximately 1.8-2.1 years in the first 2-3 years after the end of fallout and 8-10 years in the following three decades. This is equivalent to a biological half-life of about 13.2 years and results in a total 50 year dose of 6.2 times the first year exposure. Due to this decline in 90Sr-availability, the average annual activity intake of 90Sr in Austria has decreased from 840 Bq at the climax of the nuclear weapons tests to about 42 Bq in 1997 for adults, and from 500 Bq to about 35 Bq for 1 year old infants. This is equivalent to a 90Sr ingestion dose of 1.2 microSv for adults and 2.5 microSv for 1 year old infants in 1997 or less than 0.4% of the ingestion dose by natural radionuclides in the diet.
ISSN:0144-8420
1742-3406