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In situ measurement of 134Cs and 137Cs in seabed using underwater γ-spectrometry systems: application in surveys following the Fukushima Dai-ichi Nuclear Power Plant accident

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Abstract

Two underwater γ-spectrometric systems incorporating NaI(Tl) detectors (the seabed mooring system and the towing system) were used to measure radiocesium in seabed that was released due to the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident and assess the accuracy of in situ measurements on seabed. We also applied a simple calculating method for seabed radiocesium by separating the γ-spectra based on four contributions (134Cs + 137Cs, 40K, U-series, and Th-series radionuclides). The concentration of 134Cs + 137Cs in sediments at two sites in Sendai Bay were calculated to be between 10–250 Bq/kg-dry through our method with a short integration time (1–5 min).

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Acknowledgments

We thank Dr. M. Okano for his advice regarding procedures for field-testing of underwater systems and our data analysis methods. We also thank Prof. S. Nagao for the suggestion to conduct field tests of the seabed mooring system. This work was supported by a Grant-in-Aid from the Watanabe Memorial Foundation for the Advancement of Technology.

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Authors and Affiliations

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

    Hisaki Kofuji

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  1. Hisaki Kofuji
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Correspondence to Hisaki Kofuji.

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Kofuji, H. In situ measurement of 134Cs and 137Cs in seabed using underwater γ-spectrometry systems: application in surveys following the Fukushima Dai-ichi Nuclear Power Plant accident. J Radioanal Nucl Chem 303, 1575–1579 (2015). https://doi.org/10.1007/s10967-014-3702-0

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  • DOI: https://doi.org/10.1007/s10967-014-3702-0

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