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Journal Articles

Soil dust and bioaerosols as potential sources for resuspended $$^{137}$$Cs occurring near the Fukushima Dai-ichi Nuclear Power Plant

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

https://doi.org/10.1016/j.jenvrad.2023.107198
 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 $$^{137}$$Cs occurring in air. While wind-induced soil particle resuspension has been recognized as a primary mechanism of $$^{137}$$Cs resuspension, studies following the FDNPP accident suggested that fungal spores can be a significant source of the atmospheric $$^{137}$$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 $$^{137}$$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 $$^{137}$$Cs observed during winter-spring, but could not account for the higher $$^{137}$$Cs concentrations observed in summer-autumn. The higher concentrations in the summer-autumn were in general reproduced by implementing fungal spore $$^{137}$$Cs emission, that replenished low soil particle $$^{137}$$Cs resuspension in that period. According to our model's concept, $$^{137}$$Cs accumulation in fungal spores and high spore emission rate characterized by the rural environment were likely responsible for the abundance of spore $$^{137}$$Cs in the air. It was inferred that the influence of the fungal spores on the atmospheric $$^{137}$$Cs would last longer since un-decontaminated forests still exist in DRZ.

Journal Articles

Analysis of toroidal rotation effects of the ion polarization current on the neoclassical tearing mode

Takei, Nahoko; Ozeki, Takahisa; Smolyakov, A. I.*; Isayama, Akihiko; Hayashi, Nobuhiko; Iio, Shunji*; Shimada, Ryuichi*

Journal of Plasma and Fusion Research SERIES, Vol.5, p.386 - 389, 2002/00

no abstracts in English

Oral presentation

Can fungal spores explain atmospheric resuspension of radiocesium during warm season in Fukushima forest area?

Kita, Kazuyuki*; Hayashi, Naho; Igarashi, Yasuhito*; Hama, Kenzo*; Zaizen, Yuji*; Sekiyama, Tsuyoshi*; Adachi, Koji*; Yoshida, Naohiro*; Toyoda, Sakae*; Hosaka, Kentaro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Dose assessment for residents in the residential environment considering the transfer of substances between indoor and outdoor after nuclear accidents, 2; Penetration of materials resuspended outdoors

Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo

no journal, , 

no abstracts in English

Oral presentation

Dose assessment for residents in the residential environment considering the transfer of substances between indoor and outdoor after nuclear accidents, 1; Overview of research project

Takahara, Shogo; Nagakubo, Azusa; Hirouchi, Jun; Hayashi, Naho; Matsui, Yasuto*; Yoneda, Minoru*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of dose reduction effects in gymnasiums

Hayashi, Naho; Nagakubo, Azusa; Takahara, Shogo

no journal, , 

no abstracts in English

Oral presentation

Dose assessment for residents in the residential environment considering the transfer of substances between indoor and outdoor after nuclear accidents, 3; Resuspension of indoor deposited particles

Nagakubo, Azusa; Hayashi, Naho; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*; Takahara, Shogo

no journal, , 

no abstracts in English

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