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假定土壤为同质多孔介质，只考虑土壤中氡的扩散迁移，对渗流不予涉及，并假定氡扩散到空气中后立即均匀分布，在此条件下分析了氡在土壤中产生、衰变和扩散迁移规律，建立模型。用数值方法模拟计算了累积法测氡析出率所用集氡罩内氡浓度与氡析出率随时间的变化规律。分析后认?
Assuming that the soil is a homogenous porous medium, only the diffusion and migration of radon in the soil are considered, and no seepage is involved. Assuming radon is evenly distributed immediately after it diffuses into the air, the generation, decay and diffusion of radon in the soil are analyzed Migration rules, the establishment of the model. Numerical simulation was used to calculate the radon concentration and radon exhalation rate variation with time in the radome when the cumulative method was used to measure the radon exhalation rate. After the recognition?