壤中氡非稳态运移实验模拟

Experimental simulation for the transportation of radon in soil at volatile phase

根据壤中氡非稳态运移模型,通过设计实验,采用自行研制的土壤连续测氡仪,对某地下0.28 m和1.4 m深度处氡浓度进行测量,得到实验数据并拟合图形。研究结果表明,非稳态条件下壤中氡浓度受压强和温度影响随时间呈现周期性变化。氡浓度与压强变化趋势相反,与温度变化趋势一致;温度对氡运移比压强对氡运移的影响大。根据理论值和实测值的拟合情况,平均浓度误差在0.28 m处为-2.01%、在1.4 m处为-8.59%。实验成果表明,理论公式可以用于氡的运移与分布状态的研究。

According to transportation model of volatile phase radon in soil,an experiment to continuously measuring radon in soil at the depths 0.28 and 1.4 m was designed and performmed with self developed device.The obtained data were fitted and analysed.It was founded that soil radon concentration in the volatile phase was changed periodically over time and pressure,and the change was opposite to pressure and consistent with temperature.The effect of temperature to radon transport was larger than that of pressure.According to the fitting between theoretical values and measured values,the average relative difference was-2.01% at the depths 0.28 m and-8.59% at the depths 1.4 m.This indicates that the theoretical formula can be used to study the transportation and distribution of radon in soil.