Anomalously High Radon Concentrations in a Dwelling in Okinawa, Japan
Atsuyuki SorimachiDepartment of Nuclear Technology, Faculty of Engineering, Chulalongkorn University Payathai Road, Patumwan, Bangkok 10330, ThailandChutima KranrodDepartment of Nuclear Technology, Faculty of Engineering, Chulalongkorn University Payathai Road, Patumwan, Bangkok 10330, ThailandShinji TokonamiDepartment of Nuclear Technology, Faculty of Engineering, Chulalongkorn University Payathai Road, Patumwan, Bangkok 10330, ThailandTetsuo IshikawaMasahiro HosodaMirosław Janik独立行政法人 放射線医学総合研究所 放射線防護研究センターReina ShingakiDepartment of Nuclear Technology, Faculty of Engineering, Chulalongkorn University Payathai Road, Patumwan, Bangkok 10330, ThailandM. FurukawaUniversity of the Ryukyus, Faculty of Science, Nishihara, Okinawa (Japan)
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Short-term measurements of indoor radon concentrations were made in a dwelling in Okinawa, Japan, in which high radon concentrations had been observed in a previous nationwide indoor survey. Measurements were carried out in 4 locations:the bedroom, living room and outdoors. In this study, anomalously high radon concentrations were observed in the 1st-floor bedroom and the mean radon concentration averaged about 400Bq m-3 during the observation period, much higher than Japan's annual average of 15.5Bq m-3. A diurnal pattern of extreme fluctuation was found. Furthermore, there was a noticeable spatial distribution of indoor radon concentrations.
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