成都地区室内环境氡浓度和γ辐射水平调查

Investigation of indoor radon concentration and radiation levels in Chengdu Area

采用固体核径迹法和热释光剂量计，对成都市不同建造年代、建筑类型、建筑结构、建筑材料以及楼层的100间居室进行了室内环境氡浓度和y辐射水平的测量．调查结果表明：成都市居室环境中氡浓度范围为（8．4-177．1）Bq／m3,算术平均值为（39．5士22．9）Bq／m3，低于世界平均水平；y辐射水平的范围为（74．7＋-164．7）nSv／h,算术平均值为（122．0±16．2）nSv／h,与室内氡浓度无相关性．不同建筑年代、建筑类型、建筑楼层和建筑材料的房屋室内环境氡浓度水平有显著差异．室内环境氡及其子体和y辐射照射所致公众的平均年有效剂量分别为0．99mSv和0．85mSv．

Solid state nuclear track method and thermo luminescence dosimeter were used to measure indoor environmental radon concentrations and y radiation levels in 100 buildings of different building ages, housing types, construction structures, decoration materials and floors in Chengdu. The results showed that the highest level of indoor environmental radon concentration in Chengdu is 177.1 Bq/m3, the lowest level is 8.4Bq/m3,and the average level is （39.5 ~ 22.9） Bq/m3, the data is lower than average value of the world; The highest level of indoor yradiation in Chengdu is 164.7 nSv/h, the lowest level is 74.7nSv/h, and the average level is （122.0~16.2） nSv/h, which is not concerned with indoor radon concentration. Statistical analyses showed that the differences of indoor environmental radon concentration among different building ages, types, floors, and decoration materials of buildings were significant. Radon and his daughter＇s annual effective dose to shine is 0.99mSv, while the effective dose of yradiation is 0.85mSv every year.