Preliminary investigation on indoor radon concentrations in urban and rural areas of Ningxia
Objective To investigate the indoor radon concentrations and to analyze their seasonal variations in urban and rural residential dwellings in Ningxia province.Methods From March 2022 to March 2023,based on the administrative region division and population distribution in Ningxia,a total of 143 typical residential dwellings,including 82 urban houses and 61 rural houses,were selected to measure indoor radon concentration by CR-39 solid nuclear track detectors for 1 year in Ningxia,with detectors changed every 3 months.Results The annual average indoor radon concentration in Ningxia was 88 Bq/m3,range 39-226 Bq/m3.The annual average indoor radon concentration was below 100 Bq/m3 for 69.9％of the measured dwellings,and below 300 Bq/m3 for all of surveyed dwellings.Indoor radon concentrations in rural areas were much higher than those in urban areas(Z=5.85,P＜0.05).Indoor radon concentration varied significantly with the seasons,higher in autumn and winter,but lower in spring and summer,in total(x2=63.97,P＜0.05),urban(x2=24.74,P＜0.05),and rural(x2=43.15,P＜0.05).Conclusion The annual average indoor radon concentrations in all the measured dwellings are below the reference level of 300 Bq/m3 recommended by Indoor Air Quality Standard(GB/T 18883-2022)in China.
万方数据
维普
