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首页> 外文期刊>Oceanographic Literature Review >Distribution and settling behavior of americium-241 in the tropical East Pacific
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Distribution and settling behavior of americium-241 in the tropical East Pacific

机译：美洲241在热带东太平洋中的分布与沉降行为

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摘要

The distribution of the anthropogenic radionuclide ~(241)Am, a decay product of ~(241)Pu discharged from atmospheric tests of nuclear weapons, was investigated to resolve its horizontal and vertical migration in the Tropical East Pacific. We analyzed ~(241)Am concentrations in seawater samples collected in 2003. On comparing the ~(241)Am concentrations with the previously determined concentrations of ~(239+240)Pu in samples, the vertical profiles of ~(241)Am were found to be similar to those of ~(239+240)Pu. At some stations, the maximum concentration of ~(241)Am occurred 100-200 m deeper than that of ~(239+240)Pu. The ~(241)Am/~(239+240)Pu ratios in the North Pacific and South Pacific were comparable to one another, and were the typical ratio for the Pacific. The ~(241)Am distribution was influenced by the water mass at depths below 400 m. The ~(241)Am data support the view there is a current flowing at depths of 400-3000 m from the North Pacific through the Equator to the South Pacific. In addition, the ~(241)Am vertical profile was explained by using a 1-D scavenging model that considers the decay of ~(241)Pu and adsorption and scavenging by suspended particles. The different depths for the maximum concentrations of ~(241)Am and ~(239+240)Pu observed at some stations were well explained by the model and by the distribution of CaCO_3 particles. The residence time of ~(241)Am in the Pacific was also estimated by using the model.
机译：人为放射性核素〜（241）AM的分布，〜（241）PU从核武器大气检测中排出的腐烂产物，以解决热带东太平洋的水平和垂直迁移。我们分析了〜（241）AM浓度在2003年收集的海水样本中。比较样品中以前测定〜（239 + 240）PU的〜（241）浓度的〜（241）浓度，〜（241）AM的垂直轮廓发现与〜（239 + 240）PU的相似。在某些站点，最大浓度〜（241）am发生100-200米，比〜（239 + 240）PU更深。北太平洋和南太平洋的〜（241）AM /〜（239 + 240）PU比率彼此相当，并且是太平洋的典型比例。 〜（241）AM分布受到400米以下深度的水质的影响。 〜（241）AM数据支持该视图，目前通过赤道到南太平洋的北太平洋，距离北太平洋的深度为400-3000米。另外，通过使用将〜（241）PU的衰减和吸附和清除悬浮颗粒来解释〜（241）垂直轮廓。在某些站点观察到在某些站点观察到的最大浓度的〜（241）am和〜（239 + 240）Pu的不同深度良好地解释了CaCO_3颗粒的分布。通过使用模型，还估计了〜（241）在太平洋中的停留时间。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2127-2127|共1页
  • 作者

    N. Kinoshita; M. Nagaoka; T. Nakanishi;

  • 作者单位

    Institute for Technology Shimizu Corporation 3-4-17 Etchujima Koto- ku Tokyo 135- 8520 Japan;

    Institute for Technology Shimizu Corporation 3-4-17 Etchujima Koto- ku Tokyo 135- 8520 Japan;

    Institute for Technology Shimizu Corporation 3-4-17 Etchujima Koto- ku Tokyo 135- 8520 Japan;

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