Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, Ministry of Natural Resources, 184 Daxue Road, Xiamen, 361005, China.
Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, Ministry of Natural Resources, 184 Daxue Road, Xiamen, 361005, China.
Chemosphere. 2021 Dec;285:131537. doi: 10.1016/j.chemosphere.2021.131537. Epub 2021 Jul 14.
The Fukushima Dai-ichi Nuclear Power Plant Accident (FDNPPA) derived Cs, Cs and Ag in blue sharks captured in the Northwest Pacific during 2011-2018 were assessed for the first time in the aspects of radioactive contamination, temporal variation, maternal-to-fetus transfer, tissue distribution and radiation dose, to demonstrate the impacts of the FDNPPA on blue sharks. The contribution of the FDNPPA derived radiocesium in blue sharks (>52%) was estimated based on Cs/Cs. The effective and ecological half-lives of the FDNPPA derived Cs (270 d, 410 d), and Cs (430 d, 450 d) were calculated. These contaminations decreased with time and returned to the level before the FDNPPA during the period of Sep. 2017-Sep. 2018.Cs and Cs tended to distribute in muscles, while Ag mainly distribute in their guts. Cs and Cs were also transferred to fetuses and the activities were up to 30% of the maternal activities. Dose assessment demonstrated that the highest FDNPPA derived dose rate in blue sharks (0.42 nGy/h) was far below the ERICA ecosystem screening benchmark of 10 μGy/h and the committed effective dose in humans from ingesting blue shark meat (0.06-0.90 μSv) was far less than that from annual consumption of food and water. It was far from causing radiation harm to blue sharks and humans, suggesting that the impacts of the FDNPPA on blue sharks were not significant.
首次评估了 2011-2018 年期间在西北太平洋捕获的蓝鲨体内源自福岛第一核电站事故（FDNPPA）的 Cs、134Cs 和 Ag 的放射性污染、时间变化、母体向胎儿的转移、组织分布和辐射剂量，以证明 FDNPPA 对蓝鲨的影响。基于 Cs/Cs，估计了 FDNPPA 衍生放射性铯在蓝鲨中的贡献（>52%）。计算了 FDNPPA 衍生 Cs（270 d，410 d）和 Cs（430 d，450 d）的有效半衰期和生态半衰期。这些污染随时间减少，并在 2017 年 9 月至 2018 年 9 月期间恢复到 FDNPPA 之前的水平。Cs 和 Cs 倾向于分布在肌肉中，而 Ag 主要分布在其肠道中。Cs 和 Cs 也被转移到胎儿体内，其活度达到母体活度的30%。剂量评估表明，蓝鲨中源自 FDNPPA 的最高剂量率（0.42 nGy/h）远低于 ERICA 生态系统筛选基准值 10 μGy/h，从食用蓝鲨肉中摄入的人类内照射有效剂量（0.06-0.90 μSv）远低于每年食用食物和水的内照射有效剂量。这远不会对蓝鲨和人类造成辐射危害，表明 FDNPPA 对蓝鲨的影响并不显著。
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