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Nagaoka, Toshi; Moriuchi, Shigeru; Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro
Hoken Butsuri, 30, p.9 - 14, 1995/00
no abstracts in English
Furuta, Takuya; Takahashi, Fumiaki
no journal, ,
After the accident at the Fukushima Daiichi Nuclear Power Station, it became important to assess radiation doses accounting dose reduction by buildings in order to take measures for radiation protection reflecting life-styles of residents according to data of the radiation monitoring in open air. We have been analyzed the radiation dose reduction in buildings standing on a flat ground. However, slopes nearby buildings can be found in many situations of houses in Fukushima area. We performed simulation using PHITS and analyzed radiation dose rates in a wooden house, which is the most popular residential house in Fukushima area, standing nearby a slope. Here, radiation dose rates in the house were computed in a situation where radioactive cesium was distributed homogenously over the ground including the slope and compared with those in the house standing on a flat ground. We found that the variation of the dose rates in the house was not significant with and without the slope. Accordingly, high dose rates possibly found in a house nearby slopes are more likely, for instance, because of contaminated plants at the slopes than due to the geometrical effect of the slopes.
Furuta, Takuya; Takahashi, Fumiaki
no journal, ,
Precise radiation dose assessment for residents is desired for radiation protection under contaminated environment due to the accident at Fukushima Daiichi Nuclear Power Station. Evaluation of dose rates inside houses is important for this assessment as well as those outside houses by monitoring because people stays inside houses for a large part of a day. We have studied radiation dose reduction inside buildings standing on isolated flat field as the typical data. However, radiation dose reduction for houses in urban area may be different from that for isolated houses because of influence of neighboring buildings. We therefore simulated a situation of infinitely aligned houses virtually by using reflection walls placed at the boundary of geometry containing a house. The radiation dose rate inside this house was computed by transporting radiations using PHITS. We found that dose rates per unit radiation concentration inside the house was lowered as the distance between houses was reduced because of shielding effect by neighboring houses and reduction of radiation source contributed to the dose rate.
