广州新建住宅室内氡活度浓度与换气率的关系研究

选取广州市新建的3套住宅进行室内氡活度浓度与换气率的关系研究。在被测房间处于全封闭、打开空调孔洞、打开空调孔洞的同时打开窗户这三种状态时,测量室内氡活度浓度及房间换气率,研究它们相互之间的关系。此外,用活性炭盒法测量同一楼层和同一朝向不同楼层各房间的室内氡活度浓度。结果表明:广州新建住宅在全封闭的情况下卧室内的换气率都比较低,低于0.2 h^-1,而室内氡活度浓度均较高,高于200 Bq/m³;当换气率在0.5 h^-1左右时,室内氡活度浓度降到200 Bq/m³以下;当换气率高于1.0 h^-1以上时,氡活度浓度显著下降,降到了100 Bq/m³以下。在水平楼层上,室内氡活度浓度无明显的变化规律。垂直楼层方面,室内氡活度浓度随着楼层的升高整体呈现下降的趋势。

Research on the relationship between air change rate and indoor radon activity concentration in newly-built house in Guangzhou

Three sets of newly-built house in Guangzhou were selected to view the relationship between indoor radon activity concentrations and the air change rate. Indoor radon activity concentrations and the air change rate were measured when rooms were in the following three conditions: fully enclosed; air hole opened; both the air hole and the window opened. The indoor radon activity concentrations in the rooms of the same floor and in the rooms of the same side but different floors were measured using activated carbon box method. The results showed that, inside the bedroom of a totally enclosed new house in Guangzhou, the air change rate was low (less than 0.2 h^-1), and the indoor radon activity concentration was high (more than 200 Bq/m³). At the air change rate of around 0.5 h^-1, the indoor radon activity concentration dropped below 200 Bq/m³; and a significant reduction in the radon activity concentration below 100 Bq/m³ was found at the air change rate above 1.0 h^-1. Indoor radon activity concentrations decreased vertically with the increase of floor level. No obvious horizontal trend on indoor radon activity concentration was found for the same floor.