Transport of ¹³⁷Cs, ²⁴¹Am and Pu isotopes in the Curonian Lagoon and the Baltic Sea

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• 作者：G. Lujanien臈 ; N. Remeikait臈-Nikien臈 ; G. Garnaga ; K. Jok拧as ; B. 艩ilobritien臈 ; A. Stankevi膷ius ; S. 艩em膷uk ; I. Kulakauskait臈
• 关键词：137Cs ; 241Am ; 238Pu/239 ; 240Pu ; Baltic sea ; Bottom sediments ; Suspended particulate matter
• 刊名：Journal of Environmental Radioactivity
• 出版年：January, 2014
• 年：2014
• 卷：127
• 期：Complete
• 页码：40-49
• 全文大小：1858 K

文摘

Activities of ¹³⁷Cs, ²⁴¹Am and ^239,240Pu were analyzed with special emphasis on better understanding of radionuclide transport from land via the Neman River estuaries to the Baltic Sea and behavior in the marine environment. Although activity concentrations of ¹³⁷Cs in water samples collected the Baltic Sea were almost 100 times higher as compared to the Curonian Lagoon, its activities in the bottom sediments were found to be comparable. Activity ²³⁸Pu/^239,240Pu and atom ²⁴⁰Pu/²³⁹Pu ratios indicated a different contribution of the Chernobyl-originated Pu to the suspended particulate matter (SPM) and bottom sediments. The largest amount of the Chernobyl-derived Pu was found in the smallest suspended matter particles of 0.2-1聽渭m in size collected in the Klaipeda Strait in 2011-2012. The decrease of characteristic activity ²³⁸Pu/^239,240Pu and atom ²⁴⁰Pu/²³⁹Pu ratios towards the global fallout ones in surface soil and the corresponding increase of plutonium (Pu) ratios in the suspended particulate matter and bottom sediments have indicated that the Chernobyl-derived Pu, primarily deposited on the soil surface, was washed out and transported to the Baltic Sea. Behavior of ²⁴¹Am was found to be similar to that of Pu isotopes.