Xi'an AMS Center, SKLLQG, Shaanxi Key Laboratory of AMS Technology and Application, Institute of Earth Environment, CAS, Xi'an, 710061, China.
Xi'an AMS Center, SKLLQG, Shaanxi Key Laboratory of AMS Technology and Application, Institute of Earth Environment, CAS, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China.
Chemosphere. 2020 Aug;252:126524. doi: 10.1016/j.chemosphere.2020.126524. Epub 2020 Mar 17.
I 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. It is observed that the I/I 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 has been transferred and incorporated to the offshore shallow sediments. The difference in environmental behavior between I and Cs 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.
福岛第一核电站（Fukushima Daiichi Nuclear Power Plant，FDNPP）事故释放的碘已在大气、陆地和海洋环境中被观测到，其通过海水运动的分散作用以及在日本周边的沉积作用也进入了海洋沉积物中。然而，与大量的海水研究相比，对海洋沉积物岩芯的研究却很少。在这项工作中，分析了取自 FDNPP 附近的一个沉积物岩芯中的碘。结果表明，该岩芯中的碘/碘原子比与事故后在福岛近海采集的海水和沉积物中的碘/碘原子比相当，但比事故前该地区海水中的碘/碘原子比高 2 个数量级，表明大量的碘已经转移并进入了近海浅层沉积物中。通过与沉积物粒径分布的比较，讨论了碘和铯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一层中。放射性铯随沉积物岩芯中细颗粒的分布而分布，这意味着它与细颗粒高度相关。
