Elevated radioactive contamination from the Fukushima nuclear power plant accident in aquatic biota from a river with a lake in its upper reaches
Elevated radioactive contamination from the Fukushima nuclear power plant accident in aquatic biota from a river with a lake in its upper reaches
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福岛核电站事故导致上游有湖泊的河流水生生物群放射性污染加剧
DOI：
10.1139/cjfas-2016-0333
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发表时间：
2018
影响因子：
2.4
通讯作者：
AKAMA Akio
中科院分区：
文献类型：
--
作者：
YOSHIMURA Mayumi;AKAMA Akio
福岛第一核电站（FDNPP）事故已经过去了五年。森林、溪流和湖泊仍然受到放射性污染，并有轻微的趋同迹象。中禅寺湖（距离FDNPP 160公里）的褐鳟（Salmo trutta）的放射性浓度仍然超过日本规定的100 Bq·kg - 1的限制，可能是由于中禅寺湖的污染水平升高。本研究比较了2013 - 2015年源自楚禅集湖的河流（大崖遗址）和附近河流（Watarase遗址）中藻类、凋落物、沙底物和水生昆虫中134cs和137cs的浓度。在大雅站点，藻类和水生昆虫的134Cs和137Cs浓度较高（水田酶站点的藻类137Cs浓度为160 Bq·kg - 1，大雅站点的藻类137Cs浓度为320 Bq·kg - 1），尽管平均空气剂量率（0.05 μSv·h - 1）低于水田酶站点的平均空气剂量率（0.11 μSv·h - 1），但在某些类群（如Perlodidae和Heptageniidae）中仍在增加。我们认为这是由于高浓度的134cs和137cs从楚禅济湖流出。因此，被污染的水源供给的下游可能会经历长期的污染。
Five years have passed since the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident occurred. Forests, streams, and lakes remain radioactively contaminated, with slight sign of convergence. The radiocesium concentration of brown trout (Salmo trutta) in Lake Chuzenji (160 km from the FDNPP) still exceeds the Japanese regulatory limit of 100 Bq·kg−1, likely due to elevated contamination in Lake Chuzenji. In this study, the concentration of134Cs and137Cs in algae, litter, sand substrate, and aquatic insects in a river originating from Lake Chuzenji (Daiya site) and in a nearby river (Watarase site) from 2013 to 2015 were compared. At the Daiya site,134Cs and137Cs concentrations of algae and aquatic insects were high (e.g.,137Cs in algae: 160 Bq·kg−1at the Watarase site and 320 Bq·kg−1at the Daiya site) and still increasing in some groups such as Perlodidae and Heptageniidae, though the mean air dose rate (0.05 μSv·h−1) was lower than that at the Watarase site (0.11 μSv·h−1). We attributed this to high flow out of higher134Cs and137Cs concentration originating from Lake Chuzenji. Thus, lower reaches fed by contaminated headwaters will likely experience prolonged contamination.