【作者】 郭璐； 张磊； 郭秋菊；

【Author】 GUO Lu,ZHANG Lei,GUO Qiu-ju (State Key Laboratory of Nuclear Physics and Technology,School of Physics, Peking University,Beijing 100871,China)

【机构】 北京大学物理学院核物理与核技术国家重点实验室；

【摘要】 氡子体对公众的辐射照射占天然辐射照射的一半以上,而室内环境中氡子体未结合态份额是影响氡子体剂量转换系数的重要参数。为探究氡子体未结合态份额受室内外环境因素的影响规律,验证氡子体未结合态份额随室内气溶胶浓度的变化关系,本研究采用自行开发的累积式氡子体未结合态份额采样装置,以及气溶胶浓度测量仪等环境参数测量仪器,在不同建筑类型房屋内以及室外环境中进行了定期测量。半年来的实测结果表明:在室内和室外不同的环境中,氡子体未结合态份额的平均值及标准差分别是0.170±0.006和0.213±0.007;北方室内环境中气溶胶浓度、温湿度等环境参数在冬季月份中无明显变化,氡子体未结合态份额也相对稳定;室外环境中各环境参数变化较大,氡子体未结合态份额的变化也较大,且其平均值高于室内。更多还原

【Abstract】 The exposure of radon and its progeny in environment contribute more than half of the natural radiation exposure received by the public.The unattached fraction of radon progeny is an important parameter in estimating dose conversation factor(DCF)of radon progeny in indoor air.For a better understanding on the influence of environmental factors to the unattached fraction of radon progeny,a series of field experiments was performed periodically by adopting a new developed integrating monitor for measuring unattached fraction of radon progeny,and an instrument for measuring aerosol concentration in both indoor and outdoor environments.The latest results showed that the unattached fraction of radon progeny in indoor and outdoor environments were 0.170±0.006 and 0.213±0.007,respectively;It comes to the conclusion that the unattached fraction of radon progeny is stable in indoor environment because of the little change on aerosol concentration,temperature and humidity indoor during the winter in Beijing area,while on the other hand,it changes a lot in outdoor environment due to the great undulation of atmospheric factors.And further more,the average of the unattached fraction of radon progeny is higher in outdoor environments than that of indoors.更多还原