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Ota, Masakazu; Takahara, Shogo; Yoshimura, Kazuya; Nagakubo, Azusa; Hirouchi, Jun; Hayashi, Naho; Abe, Tomohisa; Funaki, Hironori; Nagai, Haruyasu
Journal of Environmental Radioactivity, 264, p.107198_1 - 107198_15, 2023/08
Times Cited Count:0 Percentile:0(Environmental Sciences)One of the current major radiation exposure pathways from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident-fallout is inhalation of the re-suspended Cs occurring in air. While wind-induced soil particle resuspension has been recognized as a primary mechanism of
Cs resuspension, studies following the FDNPP accident suggested that fungal spores can be a significant source of the atmospheric
Cs particularly in the rural areas such as difficult-to-return zone (DRZ). To elucidate the relative importance of the two resuspension phenomena, we propose a model simulating resuspension of
Cs as soil particles and fungal spores, and applied it to DRZ. Our model's calculation showed that soil particle resuspension was responsible for the surface-air
Cs observed during winter-spring, but could not account for the higher
Cs concentrations observed in summer-autumn. The higher concentrations in the summer-autumn were in general reproduced by implementing fungal spore
Cs emission, that replenished low soil particle
Cs resuspension in that period. According to our model's concept,
Cs accumulation in fungal spores and high spore emission rate characterized by the rural environment were likely responsible for the abundance of spore
Cs in the air. It was inferred that the influence of the fungal spores on the atmospheric
Cs would last longer since un-decontaminated forests still exist in DRZ.
Futemma, Akira; Sanada, Yukihisa; Nagakubo, Azusa; Kawasaki, Yoshiharu*; Iwai, Takeyuki*; Hiraga, Shogo*; Haginoya, Masashi*; Matsunaga, Yuki*; Akutsu, Yuichiro*; Urabe, Yoshimi*; et al.
JAEA-Technology 2022-027, 148 Pages, 2023/02
By the nuclear disaster of Fukushima Daiichi Nuclear Power Station (FDNPS), Tokyo Electric Power Company (TEPCO), caused by the Great East Japan Earthquake and the following tsunami on March 11, 2011, a large amount of radioactive material was released from the FDNPS. After the nuclear disaster, airborne radiation monitoring via manned helicopter has been conducted around FDNPS. The results of the airborne radiation monitoring and the evaluation for temporal change of dose rate in the fiscal 2021 were summarized in this report. Analysis considering topographical effects was applied to the result of the airborne monitoring to improve the accuracy of the conventional method. In addition, technique for discriminating gamma rays from the ground and those from the airborne Rn-progenies was also utilized to evaluate their effect on airborne radiation monitoring.
Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
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no abstracts in English
Takahara, Shogo; Nagakubo, Azusa; Hirouchi, Jun; Hayashi, Naho; Matsui, Yasuto*; Yoneda, Minoru*
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no abstracts in English
Hayashi, Naho; Nagakubo, Azusa; Takahara, Shogo
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Nagakubo, Azusa; Hayashi, Naho; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English