居室换气率对室内氡及其子体浓度的影响

采用示踪气体稀释法测量不同房间状态(开关门窗、空调和风扇)下的居室换气率,同时利用RAD7、BWLM-PLUS氡子体测量仪连续测量室内的氡及其子体浓度,探讨换气率对室内氡及其子体浓度的影响。实验结果表明:在关门窗和关门窗开空调房间状态下,房间换气率和室内氡浓度无明显差异,室内氡浓度均高于开门窗和开门窗同时开风扇的房间状态;开门窗和开门窗同时开风扇的房间状态下房间的换气率比较大,室内氡及其子体浓度基本接近外环境水平。因此,现代生活中,尤其夏季,以空调制冷的方式取代了开门窗和开风扇的生活方式,势必导致室内氡浓度的增高。

Effects of Ventilation Rate on Concentrations of Indoor Radon and Its Progenies

To study concentrations of indoor radon and its progenies,ventilation rates and their corresponding concentrations of indoor radon and its progenies were measured using tracer-gas dilution method.Results show that both ventilation rates and concentrations of indoor radon varied insignificantly and radon concentration were higher than the outdoor environment while doors and windows were all closed with air-conditioner on and off respectively;the concentrations declined and close to the outdoor level when doors and windows were all open with ventilators in operation. Accordingly,in modern life,especially in summer,people’s preference for air-conditioners but natural ventilation would result in an increase of indoor radon concentration.