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論文

Characteristics of radiocesium contamination of dry riverbeds due to the Fukushima Daiichi Nuclear Power Plant accident assessed by airborne radiation monitoring

浅見 和弘*; 太田垣 貴啓*; 石田 睦司; 眞田 幸尚

Landscape and Ecological Engineering, 14(1), p.3 - 15, 2018/01

 被引用回数:2 パーセンタイル:12.35(Biodiversity Conservation)

The Great East Japan Earthquake that occurred on March 11, 2011 generated a series of massive tsunami waves that caused severe damage to the Fukushima Daiichi Nuclear Power Plant, following which a large amount of radioactive materials was discharged from the power plant into the environment. Given the recently developed technologies for unmanned helicopters and their potential application in airborne radiation monitoring, we developed a radiation monitoring system for aerial use. We then used unmanned helicopters to measure the radiation level in areas with soil contaminated by radioactive cesium emitted from the nuclear power plant to evaluate the ambient dose-rate distribution around the site. We found that in dry riverbeds near the nuclear power plant, the dose rate was higher than that in landside areas. In addition, we carried out soil sampling in dry riverbeds. The results did not contradict the results measured by unmanned helicopter. As a result, a possible scenario is that river sediment and adjacent soil containing radioactive materials were carried from the upstream to the downstream due to an event such as a rise in water caused by a typhoon, etc., and remained in the riverbed after the water drained away. The vertical profile of radioactive materials in the soil and the measurement results for river sediment at river mouth areas corroborated the scenario.

口頭

無人ヘリコプターによる河川敷の放射線分布測定

眞田 幸尚; 土田 清文; 浅見 和弘*; 太田垣 貴啓*; 佐藤 義治; 西澤 幸康; 石田 睦司; 西原 克哉; 鳥居 建男

no journal, , 

計画区域内を中心に、無人ヘリコプター放射線測定システムにより、河川敷の放射線分布の測定を実施した。測定結果をもとに地上における土壌サンプリングを実施し、比較・考察を行った。

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