Radiocesiums (134Cs, 137Cs) in zooplankton in the waters of Miyagi, Fukushima and Ibaraki Prefectures

Journal of Radioanalytical and Nuclear Chemistry volume 303, pages1265–1271(2015)Cite this article

Abstract

Concentrations of radiocesium (134Cs and 137Cs) were measured in zooplankton in the waters of Miyagi, Fukushima, and Ibaraki Prefectures from May 2012 to January 2013. They varied from 0.1 to 9.1 Bq/kg-wet, and from 0.1 to 12.8 Bq/kg-wet for 134Cs and 137Cs, respectively. The zooplankton-to-water concentration ratio (CR) of 137Cs was calculated to be 20–1410 L/kg. Export fluxes of 137Cs by zooplankton were estimated to be 13–165 mBq/m2/y. The contribution of zooplankton for the downward transport of 137Cs was at most 18 % of the previously reported export fluxes of 137Cs by sinking particles as obtained from sediment trap observations.

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Acknowledgments

We thank Dr. Katsutoshi Kido for helpful discussions and Mr. Shinichi Yamano (KANSO Technos Co. Ltd.) for his technical support. We also thank the captains and crews of the research vessels of Fuyo Kaiyo Co. Ltd. for their help in the sampling. This work was part of a research Project contracted with the Ministry of Education, Culture, Sports, Science and Technology, Tokyo, Japan.

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Author notes

  1. Shinji Oikawa

    Present address: Nuclear Regulation Authority, 1-9-9, Roppongi, Minato-ku, Tokyo, Japan

Affiliations

  1. Central Laboratory, Marine Ecology Research Institute, 300 Iwawada, Onjuku-machi, Isumi-gun, Chiba, 299-5105, Japan

    Hyoe Takata, Masashi Kusakabe & Shinji Oikawa

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  1. Hyoe Takata
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  2. Masashi Kusakabe
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Correspondence to Hyoe Takata.

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Takata, H., Kusakabe, M. & Oikawa, S. Radiocesiums (134Cs, 137Cs) in zooplankton in the waters of Miyagi, Fukushima and Ibaraki Prefectures. J Radioanal Nucl Chem 303, 1265–1271 (2015). https://doi.org/10.1007/s10967-014-3504-4

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Keywords

  • 134Cs
  • 137Cs Zooplankton
  • Taxon
  • Export flux