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本文对求解土壤或岩石中氡浓度及表面通量密度的边界条件进行了探讨。以空气中无穷远处氡浓度为零（空气中无氡源）的自然边界条件代替通常假定以空气与土壤或岩石交界面处氡浓度为零的边界条件，给出了土壤和岩石中氡浓度及表面通量密度的数学表达式。通过对土壤和铀尾矿的具体计算，表明两种边界条件下的计算结果有较大的偏差。文中还讨论了在两类边界条件下在土壤或岩石中对流对氡浓度及表面通量密度的影响。
In this paper, the boundary conditions for solving radon concentration and surface flux density in soil or rock are discussed. Taking the natural boundary condition of zero radon concentration at infinity in the air (without radon source in the air) instead of the usual assumption that the radon concentration at the interface between air and soil or rock is zero, the radon concentration in soil and rock And the mathematical expression of surface flux density. Through the concrete calculation of soil and uranium tailings, it shows that there are big deviations in the calculation results under the two boundary conditions. The paper also discusses the effect of convection on radon concentration and surface flux density under two types of boundary conditions in soil or rock.