論文

査読有り 本文へのリンクあり
2019年11月5日

Transport and Redistribution of Radiocesium in Fukushima Fallout through Rivers

Environmental Science and Technology
  • Keisuke Taniguchi
  • ,
  • Yuichi Onda
  • ,
  • Hugh G. Smith
  • ,
  • William Blake
  • ,
  • Kazuya Yoshimura
  • ,
  • Yosuke Yamashiki
  • ,
  • Takayuki Kuramoto
  • ,
  • Kimiaki Saito

53
21
開始ページ
12339
終了ページ
12347
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acs.est.9b02890

Copyright © 2019 American Chemical Society. The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident released the most significant quantity of radiocesium into the environment since Chernobyl, and detailed measurements over the initial 5 years provide new insights into fluvial redistribution of radiocesium. We found that the high initial activity concentration of 137Cs-bearing suspended sediment in rivers was followed by a steep exponential decline (λ1) which extended to approximately 1 year after the accident, while the rate of initial decline in radiocesium activity concentration in water was an order of magnitude higher than rates measured after Chernobyl. Fluvial transport of 137Cs to the ocean from the Abukuma river totaled 12 TBq between June 2011 and August 2015 and almost all this radiocesium (96.5%) was transported in the particulate form. The primary sources of 137Cs were paddy fields, farmland, and urban areas [plaque-forming unit (PFU)], discharging 85% of the exported 137Cs from 38% of the watershed area. After 1 year, activity concentrations were lower and exhibited a more gradual secondary decline (λ2) which was associated with reduced radiocesium losses from PFU areas, while forest areas continue to represent more stable contaminant stores.

リンク情報
DOI
https://doi.org/10.1021/acs.est.9b02890
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/31490064
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