Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan.
Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan.
Mar Environ Res. 2018 Jun;137:206-224. doi: 10.1016/j.marenvres.2018.03.014. Epub 2018 Mar 30.
In bottom-sediment samples collected in 2012 from a coastal strip (∼30 km × 120 km) off the Fukushima Daiichi Nuclear Power Plant (FDNPP), radiocesium activity concentrations were generally higher south of the FDNPP, with high activity concentration patches in the north. In periodic surveys conducted at nearshore sites during 2012-2016, no clear temporal trends were observed in radiocesium activity concentrations in seawater or bottom sediment, and activity concentrations were higher in fish than in invertebrates. During 2012-2014, radiocesium activity concentrations tended to decrease in fish, but during 2012-2013 in the south, some increases were observed. Radiocesium activity concentrations were significantly higher in some fish (e.g., Okamejei kenojei) directly offshore and south of the FDNPP than in the north. Activity concentrations in fish stomach contents were significantly correlated with those in muscle tissue, suggesting that the consumption of contaminated prey contributed greatly to radiocesium contamination in demersal fish.
在福岛第一核电站（FDNPP）附近的沿海地带（约 30km×120km）于 2012 年采集的底栖沉积物样本中，放射性铯的活度浓度通常在 FDNPP 以南较高，北部则存在高活度浓度斑块。在 2012-2016 年期间在近岸点进行的定期调查中，海水和底栖沉积物中的放射性铯活度浓度没有明显的时间趋势，鱼类中的活度浓度高于无脊椎动物。在 2012-2014 年期间，鱼类中的放射性铯活度浓度趋于下降，但在 2012-2013 年期间，南部地区观察到一些增加。在 FDNPP 直接沿海和南部的一些鱼类（如 Okamejei kenojei）中的放射性铯活度浓度明显高于北部。鱼类胃内容物中的放射性铯活度浓度与肌肉组织中的放射性铯活度浓度显著相关，表明受污染猎物的摄入对底栖鱼类的放射性铯污染有很大贡献。
