129I in a sediment core offshore Fukushima: Distribution, source and its implication
129I in a sediment core offshore Fukushima: Distribution, source and its implication
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福岛近海沉积物核心中的 I-129：分布、来源及其影响
DOI：
10.1016/j.chemosphere.2020.126524
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发表时间：
2020-08-01
期刊：
影响因子：
8.8
通讯作者：
Zhou, Weijian
中科院分区：
文献类型：
--
作者：
Fan, Yukun;Hou, Xiaolin;Zhou, Weijian
福岛第一核电站(FDNPP)事故释放的I-129在大气、陆地和海洋环境中都有观察到，它还通过海水在日本各地的运动和沉积扩散进入海洋沉积物中。然而，与大量关于海水的研究相比，对海洋沉积物岩心的研究很少。在这项工作中，对FDNPP附近采集的沉积物岩芯进行了I-129的分析。研究发现，该沉积物岩心的I-129/I-127原子比与福岛近海海水和沉积物中的I-129/I-127原子比值相当，但比事故前该海域海水中的I-129原子比高2个数量级，表明大量的I-129已经转移并并入近海浅层沉积物中。根据I-129和Cs-137在沉积物中的深度分布和沉积物的粒度分布，讨论了它们在环境行为上的差异。碘同位素的峰值浓度出现在比放射性铯更深的地层中。放射性铯遵循沉积岩心中细粒的分布，暗示其与细粒的高度共生。(C)2020爱思唯尔有限公司。保留所有权利。
I-129 released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident has been observed in the atmospheric, terrestrial and oceanic environments, and it also entered the marine sediments via dispersion by sea water movement and deposition around Japan. However, there have been few studies of marine sediment cores in contrast to the large number of studies on seawater. In this work, a sediment core collected near FDNPP was analyzed for I-129. It is observed that the I-129/I-127 atomic ratios in this sediment core are comparable to those in the seawater and sediments collected from offshore Fukushima after the accident, but 2 orders of magnitude higher than those in seawater in this region before the accident, suggesting the significant amount of I-129 has been transferred and incorporated to the offshore shallow sediments. The difference in environmental behavior between I-129 and Cs-137 is discussed based on their depth distributions in the sediment core in comparison with the grain size distribution of sediments. The peak concentrations of iodine isotopes were found in a relatively deeper layer than radiocesium. Radiocesium follows the distribution of fine grains in the sediment core, implying its high association to fine grains. (C) 2020 Elsevier Ltd. All rights reserved.