Determination of plutonium activity concentrations and 240Pu/239Pu atom ratios in Brown Algae (Fucus distichus) collected from Amchitka Island, Alaska
| Autor: | Doug Dasher, Terry F. Hamilton, R. E. Martinelli, A. A. Marchetti, Thomas A. Brown, S. R. Kehl |
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| Rok vydání: | 2009 |
| Předmět: |
Fucus distichus
biology Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health biology.organism_classification Pollution Subarctic climate Analytical Chemistry Brown algae Isotopic signature Oceanography Nuclear Energy and Engineering Algae Plutonium-240 Fucus Littoral zone Environmental science Radiology Nuclear Medicine and imaging Spectroscopy |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 282:477-482 |
| ISSN: | 1588-2780 0236-5731 |
| Popis: | Plutonium-239 (239Pu) and plutonium-240 (240Pu) activity concentrations and 240Pu/239Pu atom ratios are reported for Brown Algae (Fucus distichus) collected from the littoral zone of Amchitka Island (Alaska), and at a control site at Unalaska, Alaska. The average 240Pu/239Pu atom ratio observed in dried F. distichus collected from Amchitka Island was 0.227 ± 0.007 (N = 5) and compares with the expected 240Pu/239Pu atom ratio in integrated worldwide fallout deposition in the Northern Hemisphere of 0.1805 ± 0.0057. In the absence of any evidence of a local source of plutonium containing an elevated 240Pu/239Pu isotopic signature, the characteristically high 240Pu/239Pu content of F. distichus supports the view of the existence of a discernible, basin-wide non-fallout source of plutonium entering the subarctic Pacific. |
| Databáze: | OpenAIRE |
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