出版社：Korean Society of Environmental Health and Toxicology
摘要：A lesser degree of research is avwailable with respeet to indoor radon characteristics associated with occupants" exposure. The present study evaluated the radon levels in several public-access buildings or underground feili ties,and their temporal variation in underground fecilities. Radon measurements were conducted in 2005 and 2006,uilizing a continous radon dector. A solid alpha detector (RAD7) was utilized to measure indoor radon levels. The mean radon concentrations obtained from the building or facilitieis were in a descending order: plat- forms of Dauegu subway line 2,2005 (32 Bq/m),hot-air bathroom (14 Bq/m),basement of office building (14 Bq/m),underground parking garage(14 Bq/m' ). underground shop(12 Bq/m ),nursery ( 10 Bq/m'),platforms of Daegu subway line 2. 2006(9 .0 Bq/m'),platforms of Daegu subway line 1,20068.9 Bq/m),supermarklt(79 Bq/m'),hospial(7.3 Bq/m' ),and second floor of office building (5.7 Bq/m). In general,undergroundlevel facilitieis exhibited higher radon levels as compared with ground-level facilities. It was suggsted that ventilation is an important parameter regarding the indoor levels of a subway. There was a decreasing or increasing trend in hourly-adon levels in a subway,whereas no trend were observed in a basement of office building. In addition, the radon levels in the subway lines I and 2 varied according to the platforms. The radon levels in the present study were much lower than those of previous studies. The average annual ffective dose (AED) of radiation from indoor radon exposure was estimated to be between 0.043 and 0.242 mSvlyr,depending on facility types. These AEDs were substantially lower than the worldwide average AED(2.4 mSv/yr).
