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 KranrodInstitute of Nuclear Physics PAN ul. Radzikowskiego 152, 31-342 Krakow, PolandShinji TokonamiInstitute of Nuclear Physics PAN ul. Radzikowskiego 152, 31-342 Krakow, PolandTetsuo 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 Shingaki＊＊＊ Institute of Nuclear Physics PAN ul. Radzikowskiego 152, 31-342 Krakow, PolandM. 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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