Lateral and temporal variations in Fukushima Dai-ichi NPP-derived 134Cs and 137Cs in marine sediments in/around the Sado Basin, Sea of Japan

Journal of Radioanalytical and Nuclear Chemistry volume 303, pages1313–1316(2015)Cite this article

Abstract

Lateral and temporal profiles for concentrations of 134Cs and 137Cs were examined in marine sediments obtained from coastal and offshore areas on the Sea of Japan-side of central Honshu. In 2013, concentrations declined sharply from an estuarine (30 Bq/kg-dry for 134Cs) to offshore areas. In the offshore Sado Basin, the concentration of short-lived 134Cs, which was not detected (<0.3 Bq/kg-dry) in 2010, was 1–15 Bq/kg-dry in 2011–2013. Discharged riverine materials affected by radiocesium derived from the Fukushima Dai-ichi Nuclear Power Plant have been delivered to this offshore basin.

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Acknowledgments

We thank the researchers, captain, and crew of all the R/Vs used in this study for their assistance during sampling. This study was partly supported by a Grant-in-Aid to M. Inoue (Scientific Research No. 24510011) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

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Affiliations

  1. Low Level Radioactivity Laboratory, Kanazawa University, Nomi, Ishikawa, 923-1224, Japan

    M. Inoue, S. Yoneoka, S. Ochiai, S. Nagao, M. Yamamoto, Y. Hamajima & T. Murakami

  2. Marine Ecology Research Institute, Yamabuki, Shinjuku, Tokyo, 162-0801, Japan

    S. Oikawa & J. Misonoo

  3. National Research Institute of Fisheries Science, Fisheries Research Agency, Fukuura, Kanazawa, Yokohama, 236-8648, Japan

    K. Fujimoto

  4. Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Suido-cho, Chuo-ku, Niigata, 951-8121, Japan

    Y. Yagi & N. Honda

  5. Japan Marine Science Foundation, Minato, Mutsu, Aomori, 035-0064, Japan

    H. Kofuji

Authors
  1. M. Inoue
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  2. S. Yoneoka
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  3. S. Ochiai
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  4. S. Oikawa
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  5. K. Fujimoto
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  6. Y. Yagi
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  7. N. Honda
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  8. S. Nagao
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  9. M. Yamamoto
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  10. Y. Hamajima
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  11. T. Murakami
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  12. H. Kofuji
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  13. J. Misonoo
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Corresponding author

Correspondence to M. Inoue.

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Inoue, M., Yoneoka, S., Ochiai, S. et al. Lateral and temporal variations in Fukushima Dai-ichi NPP-derived 134Cs and 137Cs in marine sediments in/around the Sado Basin, Sea of Japan. J Radioanal Nucl Chem 303, 1313–1316 (2015). https://doi.org/10.1007/s10967-014-3518-y

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Keywords

  • 134Cs
  • 137Cs
  • Marine sediment
  • Fukushima Dai-ichi nuclear power plant accident
  • Riverine particle
  • Sea of Japan