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Relationship between particle size and radiocesium in fluvial suspended sediment related to the Fukushima Daiichi Nuclear Power Plant accident

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Abstract

We collected fluvial suspended sediments in Fukushima after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident and analyzed the 137Cs concentration in bulk and size-fractioned samples to investigate the particle-size-dependent distribution of radiocesium. The 137Cs concentration in bulk suspended sediments decreased from August to December 2011, possibly reflecting a decrease of radiocesium concentration in its source materials. Smaller particles had higher radiocesium concentrations, reflecting larger specific surface areas. Silt- and sand-size fractions occupied more than 95 % of the total 137Cs in the suspended sediments. The contribution of clay-size fractions, which had the highest 137Cs concentration, was quite small because of their low frequency. A line of the data showed that the particle size distribution of radiocesium was essential to evaluate the migration and distribution of radiocesium in river systems where radiocesium is mainly present as particulate form after the FDNPP accident.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas Grant Number 24110008.

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Authors and Affiliations

  1. Institute for Sustainable Sciences and Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8530, Japan

    Kazuya Tanaka

  2. Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan

    Hokuto Iwatani, Aya Sakaguchi & Yoshio Takahashi

  3. Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan

    Yuichi Onda

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  1. Kazuya Tanaka
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  2. Hokuto Iwatani
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  4. Yoshio Takahashi
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Correspondence to Kazuya Tanaka.

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Tanaka, K., Iwatani, H., Sakaguchi, A. et al. Relationship between particle size and radiocesium in fluvial suspended sediment related to the Fukushima Daiichi Nuclear Power Plant accident. J Radioanal Nucl Chem 301, 607–613 (2014). https://doi.org/10.1007/s10967-014-3159-1

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  • DOI: https://doi.org/10.1007/s10967-014-3159-1

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