【摘要】 本文使用RAD7测氡仪测量了衡阳某新装修住宅在关闭门窗、使用新风系统和打开门窗三种条件下的室内氡浓度并研究了其变化规律。结果表明：关闭门窗的情况下室内氡浓度最高，约是启用新风系统时的3倍，是自然通风的8～10倍。关闭门窗时室内氡浓度最大值高达145 Bq/m~3，超过了我国新建住房目标水平。关闭门窗和使用新风系统时客厅浓度均高于卧室，可能与客厅氡析出面积大、地面装饰材料瓷砖放射性高于木地板有关。室内氡浓度与温度不具有简单的负相关关系。该住宅在三种通风条件下，年有效剂量均低于国家控制标准，其中密闭条件下最大，启用新风系统时明显降低，自然通风时最低。使用新风系统可以有效降低室内氡浓度，减少氡对人体健康的危害。更多还原

【Abstract】 In this paper, the RAD7 type spectrum radon detector was used to measure the indoor radon concentration in the bedroom and living room under three conditions of closing doors and windows, using fresh air system and opening doors and windows and its change rule is studied. The results show that the indoor radon concentration is the highest when the doors and windows are closed,which is about three times of that when the fresh air system is used and eight to ten times of that when the natural ventilation is used.When the doors and windows are closed, the maximum indoor radon concentration is as high as 145Bq/m~3, which exceeds the target level of new houses in China. When the doors and windows are closed and the fresh air system is used, the concentration of radon in the living room is higher than that in the bedroom, which may be related to the large radon precipitation area in the living room and the fact that the radioactivity of the ground decorative material tile is higher than that of the wood floor. Under the three ventilation conditions, the annual effective dose of the house is lower than the national control standard, which is the maximum under closed conditions, significantly lower when the fresh air system is used,and the lowest when natural ventilation is used. The use of fresh air system can effectively reduce the indoor radon concentration and reduce the harm of radon to human health.更多还原