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Journal Articles

Penetration factor and indoor deposition rate of elementary and particulate iodine in a Japanese house for assessing the effectiveness of sheltering for radiation exposures

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:2 Percentile:32.89(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$$_{2}$$ and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 $$sim$$ 1 for particles of 0.3 $$sim$$ 1 $$mu$$m and 0.15 $$sim$$ 0.7 for I$$_{2}$$ depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 $$sim$$ 0.2 h$$^{-1}$$ for particles of 0.3$$sim$$1 $$mu$$m and 0.2$$sim$$1.5 h$$^{-1}$$ for I$$_{2}$$ depending on floor materials.

Journal Articles

Bioaccessibility of Fukushima-accident-derived Cs in soils and the contribution of soil ingestion to radiation doses in children

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

AA2015-0445.pdf:0.53MB

 Times Cited Count:6 Percentile:52.4(Public, Environmental & Occupational Health)

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 5; Investigation of deposition rate in real houses

Hirouchi, Jun; Takahara, Shogo; Komagamine, Hiroshi*; Munakata, Masahiro; Kimoto, Shigeru*; Yoneda, Minoru*; Matsui, Yasuto*

no journal, , 

no abstracts in English

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 4; Investigation of penetration factor with a test chamber

Kimoto, Shigeru*; Sadatani, Yoshiro*; Yoneda, Minoru*; Matsui, Yasuto*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Experimental evaluation on behavior of iodine gas

Kimoto, Shigeru*; Shiota, Kenji*; Nishiguchi, Kohei*; Matsui, Yasuto*; Hirouchi, Jun; Yoneda, Minoru*

no journal, , 

no abstracts in English

Oral presentation

Measurement experiment of particle deposition rate and ventilation rate in houses

Shakagori, Shota*; Murai, Chiaki*; Kimoto, Shigeru*; Matsui, Yasuto*; Yoneda, Minoru*; Hirouchi, Jun

no journal, , 

no abstracts in English

Oral presentation

Penetration factor and indoor deposition rate of elementary and particulate iodine in a Japanese house for assessing the effectiveness of sheltering for radiation exposures

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$$_{2}$$ and particles. The experiment was performed in two apartment houses, three single-family houses, and chambers. The obtained penetration factor ranged 0.3 $$sim$$ 1 for particles of 0.3 $$sim$$ 1 $$mu$$m and 0.1 $$sim$$ 0.6 for I$$_{2}$$ depending on the air exchange rate. The indoor deposition rate for a house room ranged 0.007 $$sim$$ 0.2 h$$^{-1}$$ for particles of 0.3$$sim$$1 $$mu$$m and 0.2$$sim$$1.5 h$$^{-1}$$ for I$$_{2}$$ depending on floor materials.

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

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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