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137Cs and 210Po in Pacific walrus and bearded seal from St. Lawrence Island, Alaska.

https://arctichealth.org/en/permalink/ahliterature87290
Source
Mar Pollut Bull. UCRL-JRNL-211213 (2005) and 2008 Jun;56(6):1158-67
Publication Type
Article
Date
Jun-2008
  1 document  
Author
Hamilton Terry
Seagars Dana
Jokela Terry
Layton David
Author Affiliation
Environmental Science Division, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94550-0808, USA. hamilton18@llnl.gov
Source
Mar Pollut Bull. UCRL-JRNL-211213 (2005) and 2008 Jun;56(6):1158-67
Date
Jun-2008
Language
English
Publication Type
Article
File Size
256809
Abstract
The activity concentration of Cesium-137 ((137)Cs) and naturally-occurring Polonium-210 ((210)Po) were measured in the muscle tissue, kidney and liver of Pacific walrus (Odobenus rosmarus divergens) and bearded seal (Erignathus barbatus) collected by native hunters from the Bering Sea during May 1996. The mean (137)Cs concentrations in muscle, liver and kidney of Pacific walrus were 0.07, 0.09 and 0.07 Bq kg(-1) (n=5, wet weight), respectively, and 0.17, 0.10, and 0.17 Bq kg(-1) (n=2, wet weight), respectively, in bearded seal. In general, (137)Cs tissue concentrations are significantly lower than those previously reported for mammals from other regions. By comparison, (210)Po activity concentrations are more variable and appear to be higher level compared with mammal data from other regions. The mean (210)Po concentration in the muscle tissue, liver and kidney of Pacific walrus (n=5, wet weight) were 28.7, 189, and 174 Bq kg(-1), respectively. This compares with (210)Po concentration values (n=2, wet weight) of 27, 207 and 68 Bq kg(-1) measured in the muscle tissue, liver and kidney, of bearded seal, respectively. Estimated concentration factors--as defined by the radionuclide concentration ratio between the target tissue to that in sea water--were two to three orders of magnitude higher for (210)Po that those of (137)Cs. We conclude from radiological dose estimates that ingestion of (137)Cs in foods derived from walrus and seal will pose no threat to human health. This work has important implications for assessment of risks of Alaskan coastal communities concerned about the dumping of nuclear waste in the Russia Arctic.
PubMed ID
18371988 View in PubMed
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