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Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Kato, Nobuyuki*; Matsui, Yasuto*; Yoneda, Minoru*
Journal of Radiological Protection, 41(3), p.S139 - S149, 2021/09
Times Cited Count：4 Percentile：31.52(Environmental Sciences)Sheltering is one of the countermeasures for protection against radiation exposures in nuclear accidents. The effectiveness of sheltering is often expressed by the reduction factor, that is the ratio of the indoor to the outdoor cumulative radioactivity concentrations or doses. The indoor concentration is mainly controlled by the air exchange rate, penetration factor, and indoor deposition rate. The penetration factor and indoor deposition rate depend on the surface and opening materials. We investigated experimentally these parameters of I
and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 
1 for particles of 0.3 1 
m and 0.15 0.7 for I depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 0.2 h
for particles of 0.31 m and 0.21.5 h for I depending on floor materials.
Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Iijima, Masashi; Shimada, Yoko*; Matsui, Yasuto*
Risk Analysis, 37(7), p.1256 - 1267, 2017/07
Times Cited Count：6 Percentile：47.83(Public, Environmental & Occupational Health)Kimoto, Shigeru*; Sadatani, Yoshiro*; Yoneda, Minoru*; Matsui, Yasuto*; Hirouchi, Jun
no journal, ,
no abstracts in English
Kimoto, Shigeru*; Shiota, Kenji*; Nishiguchi, Kohei*; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*
no journal, ,
no abstracts in English
Shakagori, Shota*; Murai, Chiaki*; Kimoto, Shigeru*; Matsui, Yasuto*; Yoneda, Minoru*; Hirouchi, Jun
no journal, ,
no abstracts in English
Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Munakata, Masahiro; Kimoto, Shigeru*; Yoneda, Minoru*; Matsui, Yasuto*
no journal, ,
no abstracts in English
Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Kato, Nobuyuki*; Matsui, Yasuto*; Yoneda, Minoru*
no journal, ,
Sheltering is one of the countermeasures for protection against radiation exposures in nuclear accidents. The effectiveness of sheltering is often expressed by the reduction factor, that is the ratio of the indoor to the outdoor cumulative radioactivity concentrations or doses. The indoor concentration is mainly controlled by the air exchange rate, penetration factor, and indoor deposition rate. The penetration factor and indoor deposition rate depend on the surface and opening materials. We investigated experimentally these parameters of I and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 1 for particles of 0.3 1 m and 0.1 0.6 for I depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 0.2 h for particles of 0.31 m and 0.21.5 h for I depending on floor materials.
Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English
Takahara, Shogo; Nagakubo, Azusa; Hirouchi, Jun; Hayashi, Naho; Matsui, Yasuto*; Yoneda, Minoru*
no journal, ,
no abstracts in English
Nagakubo, Azusa; Hayashi, Naho; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English
Hirouchi, Jun; Watanabe, Masatoshi*; Hayashi, Naho; Nagakubo, Azusa; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English
Hayashi, Naho; Nagakubo, Azusa; Hirouchi, Jun; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
no abstracts in English
Nagakubo, Azusa; Hayashi, Naho; Hirouchi, Jun; Matsui, Yasuto*; Yoneda, Minoru*; Takahara, Shogo
no journal, ,
In the residential environment after a nuclear power plant accident, the effects of diffusion and deposition of radionuclides have been considered for exposure due to the entry of outdoor resuspended radionuclides into the indoor environment. In practice, however, resuspension of deposited particles also occurs. In this study, the resuspension coefficient, defined as the ratio of the airborne concentration to the floor surface deposition density, was obtained experimentally to construct a resuspension model for indoor deposited particles. In the experiment, the resuspension coefficient was obtained by spreading test dust on the flooring of a family home and measuring the concentration of resuspended particles when disturbances such as the operation of air conditioning and human movement were applied. The results showed that the resuspension coefficient ranged from 1.0e-5 to 1.0 (m-1) depending on the type of disturbance and particle size. This work was supported by Research Project on the Health Effects of Radiation organized by Ministry of the Environment, Japan.
