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目的分析日光温室内氡及其子体、PM 2.5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PM 2.5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/m~3、(43.1±8.9)Bq/m~3和(45.5±15.9)Bq/m~3(n=12,28.1~169Bq/m~3);室内PM 2.5浓度在28~248μg/m~3。结论氡子体浓度C_p与室内外PM 2.5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。
Objective To analyze the influencing factors of radon and its daughters and PM 2.5 concentration in solar greenhouse. Methods The radon, its progenies and PM 2.5 concentrations in three greenhouses in Beijing were measured by radon-thoron radioactive gas and its daughter body measuring instrument, electret detector and particle concentration measuring instrument. Results The average radon concentrations in the three greenhouses were (135 ± 41.9) Bq / m 3, 43.1 ± 8.9 Bq / m 3 and 45.5 ± 15.9 Bq / m 3 respectively (n = 12,28.1-169Bq / m ~ 3). The indoor PM 2.5 concentration ranged from 28 ~ 248μg / m ~ 3. Conclusion The concentration of radon progeny C_p is significantly correlated with the concentration of PM 2.5 indoors and outdoors. Fog and haze weather led to air C_p increased, thereby increasing the F value. The average values of F in solar greenhouse and control room were (0.62 ± 0.13) (n = 24,0.42 ~ 0.94) and (0.61 ± 0.16) (n = 22,0.36 ~ 0.94), respectively, which were significantly higher than those of world standard of 0.40. Soil is an important source of radon in solar greenhouse, radon concentration and soil exposure area.