成都市部分地下商场空气氡浓度测量研究

Measurement of Radon Concentration in the Air of Some Underground Shopping Malls in Chengdu

为了解成都市地下商场空气氡浓度水平,使用FD216型环境氡测量仪,对分散在成都市区的10家地下商城进行了空气氡浓度调查,总计测量点61个。测量后对工作人员和顾客的年有效剂量进行估计,并与以往测量结果进行对比分析。测量结果表明:地下商场室内空气氡浓度的平均值为30.9 Bq/m^(3),标准差为8.87 Bq/m^(3),分布在18.2~53.1 Bq/m^(3)范围内,远低于国家标准限值400 Bq/m^(3)。室外平均空气氡浓度为22.0 Bq/m^(3),低于室内平均空气氡浓度。商场工作人员年有效剂量平均值为0.527 mSv,低于国家标准限值1 mSv,顾客的年有效剂量更低。氡浓度测量值与以往测量值进行对比分析,成都市地下商场空气氡浓度均处于较低水平。

To understand the air radon concentration level of underground shopping malls in Chengdu,a FD216 environmental radon measuring instrument was used to investigate the air radon concentration of 10 underground shopping malls scattered in the urban area of Chengdu,with total of 61 measurement points.Based on measurement results,the annual effective dose of staff and customers was estimated and compared with the previous measurement results.The measurement results showed that the average indoor radon concentration in underground shopping malls was 30.9 Bq/m^(3),with a standard deviation of 8.87 Bq/m^(3),distributed within the range of(18.2-53.1)Bq/m^(3).The results were far below the limit of national standard(400 Bq/m^(3)).The average outdoor radon concentration was 22.0 Bq/m^(3),which was lower than the indoor average radon concentration.The average annual effective dose of staff was 0.527 mSv,which was lower than the limit of national standard(1 mSv).The annual effective dose of customers was lower than that of staff.Comparing and analyzing the measured values of radon concentration with previous measurements,it was found that the radon concentration in the air of underground shopping malls in Chengdu was at a low level.