Long Term Temporal Changes of <sup>90</sup>Sr and <sup>137</sup>Cs in Seawater, Bottom Sediment and Marine Organism Samples - from the Chernobyl Accident to Immediately after the Fukushima Accident -

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  • OIKAWA Shinji
    Central Laboratory, Marine Ecology Research Institute
  • WATABE Teruhisa
    Research and Survey Group, Head Office, Marine Ecology Research Institute
  • TAKATA Hyoe
    Central Laboratory, Marine Ecology Research Institute
  • SUZUKI Chiyoshi
    Research and Survey Group, Head Office, Marine Ecology Research Institute
  • NAKAHARA Motokazu
    Research and Survey Group, Head Office, Marine Ecology Research Institute
  • MISONOO Jun
    Research and Survey Group, Head Office, Marine Ecology Research Institute

Bibliographic Information

Other Title
  • 日本周辺の海水，海底土，海産生物に含まれる <sup>90</sup>Sr及び<sup>137</sup>Cs濃度の長期的推移<br>─チェルノブイリ事故前から福島第一原子力発電所事故後まで─
  • 日本周辺の海水,海底土,海産生物に含まれる⁹⁰Sr及び¹³⁷Cs濃度の長期的推移 : チェルノブイリ事故前から福島第一原子力発電所事故後まで
  • ニホン シュウヘン ノ カイスイ,カイテイド,カイサン セイブツ ニ フクマレル ⁹ ⁰ Sr オヨビ ¹ ³ ⁷ Cs ノウド ノ チョウキテキ スイイ : チェルノブイリ ジコ マエ カラ フクシマ ダイイチ ゲンシリョク ハツデンショ ジコ ゴ マデ
  • Long term temporal Changes of 90Sr and 137Cs inseawater, bottom sediment and marine organism samples -from the Chernobyl accident to intermediately after the Fukushima accident-
  • Long term temporal changes of 90Sr and 137Cs in seawater, bottom sediment and marine organism samples. From the Chernobyl accident to immediately after the Fukushima accident

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Abstract

A radioactivity survey program was launched in 1983 to determine the background levels of artificial radionuclides, such as 90Sr and 137Cs in the marine environment off commercial nuclear power stations. In this paper, we report on the long-term temporal changes of 90Sr and 137Cs in seawater, bottom sediment and marine organism samples. Both 90Sr and 137Cs have been detected since the beginning of the program in the seawater samples. Their concentrations decreased slowly over time, except for a prompt rise of the 137Cs concentration caused by the Chernobyl nuclear accident in 1986, and reached the level corresponding to 1-2 mBq L−1 for both radionuclides just before the Fukushima accident. The concentration of 137Cs in the bottom sediments widely varied, unlike that in seawater from one sampling site to another. The highest 137Cs concentration was observed in marine organisms in 1986, when the Chernobyl nuclear accident occurred, and was followed by relatively high concentrations for some years. The 137Cs concentration gradually decreased thereafter during the 1990s. The most recent results before the Fukushima accident suggested that the 137Cs concentration would not be more than 1-2 mBq L−1, ND (below the detection limit) to 8 Bq kg−1-dry and ND to 0.24 Bq kg−1-wet, respectively, for seawater, bottom sediment and marine organism samples. A post-accident monitoring after the Fukushima accident revealed a heavy burden of artificial radionuclides in the marine environment adjacent to Fukushima Prefecture. This paper also summarizes the 90Sr and 137Cs monitoring data in the seawaters, bottom sediments and marine organisms immediately after the accident. A comparison of data was made between the precedent situation before the accident and the post-accident situation in order to assess the impacts of the Fukushima accident on the adjacent marine environment.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 62 (6), 455-474, 2013

    The Japan Society for Analytical Chemistry

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