Indoor radon concentration in residential buildings in Wuxi City
FENG Yue, CHEN Rong, SHEN Xiaolei, ZENG Yanan, LI Qinghua
The Affiliated Wuxi Center for Disease Control and Prevention of Nanjing Medical University, Wuxi Center for Disease Control and Prevention, Wuxi, Jiangsu 214023, China
Abstract：Objective To investigate the indoor radon concentration and its distribution characteristics in residential buildings in Wuxi City, Jiangsu Province, so as to provide the evidence for indoor radon risk assessment and health protection. Methods From April to September 2023, a stratified random sampling method was used to select 120 residential units from 6 districts (cities) in Wuxi City as measurement points, with monitoring conducted over a period of 3 months. Additionally, 27 residential units were selected for monitoring at the same location in both spring and summer. Sampling was performed using Rn-2012 passive cumulative radon cups, and radon concentration was measured using the TASLimage solid state nuclear track detector etching measurement and analysis system after etching. Indoor radon concentrations were analyzed by region, floor level, season, and building age, and the annual effective dose attributable to indoor radon was estimated. Results The mean indoor radon concentration in Wuxi City was (62.43±40.41) Bq/m3. Twelve measurement points (10.00%) had radon concentrations >100 Bq/m3. The average annual effective dose to the public from indoor radon was 2.04 mSv. The mean indoor radon concentrations in Binhu District, Liangxi District, Xinwu District, Huishan District, Xishan District, and Yixing City were (68.13±41.13), (42.63±24.86), (70.00±40.37), (41.97±24.52), (65.50±48.44), and (56.04±27.49) Bq/m3, respectively, with no statistically significant difference (P>0.05). The median indoor radon concentrations for floors 1-5, 6-9, 10-20, and >20 were 49.20 (interquartile range, 29.68), 67.60 (interquartile range, 62.00), 76.09 (interquartile range, 49.65), and 48.26 (interquartile range, 17.27) Bq/m3, respectively, with no statistically significant difference (P>0.05). Among the 27 measurement points, the mean summer indoor radon concentration was (96.86±13.01) Bq/m3, which was significantly higher than that in spring (59.00±10.20) Bq/m3 (P<0.05). The median radon concentration for residential buildings constructed between 1990 and 2009 was 48.00 (interquartile range, 33.92) Bq/m3, and that for buildings constructed between 2010 and 2023 was 53.80 (interquartile range, 41.25) Bq/m3, with no statistically significant difference (P>0.05). Conclusions The mean indoor radon concentration in residential buildings in Wuxi City is below the national annual average radon concentration target level. However, the annual effective dose to the public attributable to indoor radon is relatively high. Attention should be paid to the effects of building material type, seasonal variation, and ventilation conditions on radon concentration.
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