Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, State Oceanic Administration, 184 Daxue Road, Xiamen 361005, China.
Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, State Oceanic Administration, 184 Daxue Road, Xiamen 361005, China.
Ecotoxicol Environ Saf. 2017 Oct;144:601-610. doi: 10.1016/j.ecoenv.2017.06.042. Epub 2017 Jul 8.
This study investigated the radioactive impacts on 10 nekton species in the Northwest Pacific more than one year after the Fukushima Nuclear Accident (FNA) from the two perspectives of contamination and harm. Squids were especially used for the spatial and temporal comparisons to demonstrate the impacts from the FNA. The radiation doses to nekton species and humans were assessed to link this radioactivity contamination to possible harm. The total dose rates to nektons were lower than the ERICA ecosystem screening benchmark of 10μGy/h. Further dose-contribution analysis showed that the internal doses from the naturally occurring nuclide Po were the main dose contributor. The dose rates from Cs, Cs, Sr and Ag were approximately three or four orders of magnitude lower than those from naturally occurring radionuclides. The Po-derived dose was also the main contributor of the total human dose from immersion in the seawater and the ingestion of nekton species. The human doses from anthropogenic radionuclides were ~ 100 to ~ 10,000 times lower than the doses from naturally occurring radionuclides. A morbidity assessment was performed based on the Linear No Threshold assumptions of exposure and showed 7 additional cancer cases per 100,000,000 similarly exposed people. Taken together, there is no need for concern regarding the radioactive harm in the open ocean area of the Northwest Pacific.
本研究从污染和危害两个角度调查了福岛核事故（FNA）一年多后西北太平洋 10 种洄游物种的放射性影响。鱿鱼特别用于时空比较，以展示 FNA 的影响。评估了洄游物种和人类的辐射剂量，将这种放射性污染与可能的危害联系起来。洄游动物的总剂量率低于 ERICA 生态系统筛选基准值 10μGy/h。进一步的剂量贡献分析表明，来自天然放射性核素 Po 的内剂量是主要的剂量贡献者。Cs、Cs、Sr 和 Ag 的剂量率比天然放射性核素低约三到四个数量级。来自 Po 的剂量也是人类因浸泡在海水中和摄入洄游动物而受到的总剂量的主要贡献者。人类从人为放射性核素中摄入的剂量比天然放射性核素低约 100 到 10,000 倍。根据暴露的线性无阈值假设进行了发病率评估，显示每 1 亿名同样暴露的人中额外有 7 例癌症病例。总的来说，西北太平洋开阔海域不存在放射性危害的担忧。
