Determination of plutonium activity concentrations and 240Pu/239Pu atom ratios in Brown Algae (Fucus distichus) collected from Amchitka Island, Alaska

被引：0
作者：
Terry Hamilton
Doug Dasher
Tom Brown
Roger Martinelli
Alfredo Marchetti
Steven Kehl
机构：
[1] Lawrence Livermore National Laboratory,Center for Accelerator Mass Spectrometry
[2] Alaska Department of Environmental Conservation,B Division, Weapons and Complex Integration Directorate
[3] Lawrence Livermore National Laboratory,undefined
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2009年 / 282卷
关键词：
Plutonium; Pu/; Pu atom ratio; Amchitka Island: Bering Sea; Brown Algae (; );
D O I：
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摘要：
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.
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页码：477 / 482
页数：5
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