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          在塞拉菲尔德,影响东部爱尔兰海人为放射性核素分布的控制

          理解人为放射性核素生物地球化学和流动性的自然系统的关键是提高放射性污染的环境和放射性废物的管理。在这里,我们描述的当代深度分销和相分配 137CS,PU和 241Am in two sediment cores taken from the Irish Sea (Site 1: the Irish Sea Mudpatch; Site 2: the Esk Estuary). Both sites are located ~10 km from the Sellafield nuclear site. Low-level aqueous radioactive waste has been discharged from the Sellafield site into the Irish Sea for >50 y. We compare the depth distribution of the radionuclides at each site to trends in sediment and porewater redox chemistry, using trace element abundance, microbial ecology, and sequential extractions, to better understand the relative importance of sediment biogeochemistry vs. physical controls on radionuclide distribution/post-depositional mobility in the sediments. We highlight that the distribution of 137CS,PU和 241上午在这两个网站在很大程度上是由沉积物的物理混合,物理传输过程,以及泥沙淤积控制。有趣的是,在ESK河口,微生物介导的氧化还原过程(考虑PU)似乎并没有提供显著控制在Pu分布,即使在年代际时间尺度。我们还强调指出,爱尔兰海mudpatch可能仍然作为历史污染在爱尔兰海其他地区的来源,尽管塞拉菲尔德现场垃圾产量不断降低的水平。

          作者:

          射线d,利里P,livens女,灰色N,莫里斯K,KA法,漂白AJ,abrahamsen-磨机升, 豪Ĵ,蒂尔尼K,缪尔克,法GTW

          总环境科学:743
          11,15,2020
          网页:140765
          DOI: 10.1016 / j.scitotenv.2020.140765

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