日光温室氡及子体水平及影响因素研究

目的 分析日光温室内氡及其子体、PM2.5浓度水平的影响因素。方法 采用氡钍射气及其子体测量仪、驻极体探测器以及颗粒物浓度测量仪对北京市区的3座日光温室的氡及其子体和PM2.5浓度进行了测量。结果 3座温室氡浓度均值分别为(135±41.9) Bq/m³、(43.1±8.9) Bq/m³和(45.5±15.9) Bq/m³(n=12,28.1~169Bq/m³);室内PM2.5浓度在28~248 μg/m³。结论 氡子体浓度C_p与室内外PM2.5浓度有显著相关性。雾霾天气导致空气中C_p增高,进而使F值增高。日光温室和对照房间的F值均值为(0.62±0.13)(n=24,0.42~0.94)和(0.61±0.16)(n=22,0.36~0.94),明显高于0.40的世界典型值。土壤是日光温室氡气的重要来源,氡浓度与土壤暴露面积有关。

Study on Radon and Its Progeny Level and Influencing Factors in Sunlight Greenhouses

Objective Analysis of the concentrations of radon, radon progeny and PM2.5 in the sunlight greenhouse. Methods The concentrations of radon, radon progeny and PM2.5 in three sunlight greenhouses in Beijing area were measured by radon and progeny measurement instrument, electret detector and particle concentration measurement instrument. Results The results showed the average radon concentration C_Rn was (135±41.9) Bq/m³,(43.1±8.9) Bq/m³ and (45.5±15.9) Bq/m³(n=12,28.1~169 Bq/m³). Indoor PM 2.5 concentration range was from 28~248 μg/m³. Conclusion Radon progeny concentration C_p was significantly correlated with PM 2.5 concentrations indoor and outdoor. The fog and haze weather cause C_p increased in the air, then F value increased. The mean F value in sunlight greenhouse and the control room was 0.62±0.13(n=24,0.42~0.94) and (0.61±0.16) (n=22,0.36~0.94), it is significantly higher than the 0.40 typical values of the world. Soil is an important source to sunlight greenhouses. Radon concentration inside is related to the exposure of soil.