摘要
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, instead of the boundary condition that radon concentration at the interface of the air and medium is equal to zero, the natural boundary condition that radon concentration in air is equal to zero at infinite point (no radon source in air) is applied to derive the expressions of radon concentration and surface flux density in soil and rock. The results show that there is a relatively large deviation for calculating results under two kinds of boundary conditions. Moreover, the influence of convection current is discussed for difference conditions. (
出处
《辐射防护》
CAS
CSCD
北大核心
1999年第2期121-126,共6页
Radiation Protection
关键词
氡浓度
土壤
岩石
表面通量密度
边界条件
Radon Concentration, Diffusion, Convection Current, Soil, Rock)
