海洋理工学会誌
Online ISSN : 2188-3262
Print ISSN : 1341-2752
原著
USVを用いた海底の放射能分布測定システムの開発―福島沿岸域での海底放射性物質濃度の経年変化傾向の測定例―
眞田 幸尚宮本 賢治越智 康太郎松崎 康治小川 年弘千賀 康弘
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ジャーナル フリー

2018 年 24 巻 2 号 p. 9-18

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Seven years passed since Fukushima Dai-ichi Nuclear Power Station accident which was caused large amount of radionuclide release to the sea. Elucidation of behavior mechanism of radiocesium in the seabed is required for restarting fishing industry. We developed radiation detection system using the unmanned surface vehicle for in-situ measurement of radiocesium concentration in seabed sediment. This system is able to automatically navigate to measurement point and obtain the radiation data on the bottom sediment. The detector was calibrated by comparing the actual sediment samples. The periodical measurement off-shore the Fukushima Prefecture was performed using developed this system. As these results, distribution of radiocesium concentration was changed due to oceanographic condition. However, radiocesium inventory was tendency to decrease according to radiocesium half-life in measurement area. This system is effective for elucidation of behavior mechanism of radiocesium because it can easily measure the radiocesium concentration in the bottom sediment.

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