室内用水暴气过程逸出的氡扩散模型

Diffusion model of radon from the water-exposed-to-air during daily use of water

采用塑料杯型监测器和SY—1型CR—39塑料探测器,对北京中关村部分家庭卫生间、厨房和单位浴室布点进行累积监测,结果表明在用水暴气过程中氡随之逸出并向周围环境扩散,使用水处附近氡浓度比不用水处高,但随离用水处距离的增加而明显下降。建立了逸出的氡扩散数学模型,得出氡从马桶水、厨房和浴室水龙头处向室内外扩散系数分别为:6.597×10^(-9)、5.934×10^(-9)、3.560×10^(-9)m^2/s。

Passive time-integrating 222Rn plastic monitors and SY-1 CR-39 were used for radon measurement. The effect of water-exposed-to-air during daily use of water (in the bathroom, toilet and kitchen) on indoor radon concentration was surveyed for some families situated in Zhongguancun, Beijing. It is shown that the unusual quantities of radon could be separated out and go into the surrounding air during normal use of water, and especially in winter the radon concentration near the tap in the kitchen is about twice as much as the other place and the concentration in the bathroom is 3-4 times higher than that in changing-rQom. A diffusion model was set up and the diffusion coefficients from water in the toilet, kitchen and bathroom were calculated to be 6.597×10-9, 5.934×10-9 and 3.560×10-9 m2/s, respectively.