（137）Cs、（241）Am 和 Pu 同位素在库尔斯沙嘴泻湖和波罗的海中的迁移。
Transport of (137)Cs, (241)Am and Pu isotopes in the Curonian Lagoon and the Baltic Sea.
机构信息
SRI Center for Physical Sciences and Technology, Vilnius, Lithuania.
出版信息
J Environ Radioact. 2014 Jan;127:40-9. doi: 10.1016/j.jenvrad.2013.09.013. Epub 2013 Oct 18.
Activities of (137)Cs, (241)Am and (239,240)Pu 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 (137)Cs 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 (238)Pu/(239,240)Pu and atom (240)Pu/(239)Pu 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 μm in size collected in the Klaipeda Strait in 2011-2012. The decrease of characteristic activity (238)Pu/(239,240)Pu and atom (240)Pu/(239)Pu 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 (241)Am was found to be similar to that of Pu isotopes.
对（137）Cs、（241）Am 和（239、240）Pu 的活度进行了分析，特别强调了更好地了解放射性核素从陆地通过涅曼河河口向波罗的海迁移及其在海洋环境中的行为。尽管从波罗的海采集的水样中的（137）Cs 活度比库尔斯沙嘴泻湖高近 100 倍，但在底部沉积物中的活度却相当。（238）Pu/（239、240）Pu 和原子（240）Pu/（239）Pu 比值表明，切尔诺贝利起源的 Pu 对悬浮颗粒物（SPM）和底泥的贡献不同。在 2011-2012 年期间在克莱佩达海峡采集的 0.2-1μm 大小的最小悬浮物质颗粒中发现了最多的切尔诺贝利衍生 Pu。特征活度（238）Pu/（239、240）Pu 和原子（240）Pu/（239）Pu 比值向全球沉降比值的降低以及相应的悬浮颗粒物和底泥中钚（Pu）比值的增加表明，主要沉积在土壤表面的切尔诺贝利衍生 Pu 被冲刷并输送到波罗的海。（241）Am 的行为被发现与 Pu 同位素相似。
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