Hart K P, Levins D M, Fane A G
Health Phys. 1986 Mar;50(3):369-79. doi: 10.1097/00004032-198603000-00003.
Uranium tailings piles are generally rehabilitated by covering them with a number of layers of earthen materials. This paper derives exact equations for the Rn concentration profile and flux attenuation through any number of covering layers. The equations take account of the distribution of Rn between interstitial air and water. Numerical examples are given to show that approximate methods give rise to significant errors in some circumstances. The flux attenuation factor depends not only on the diffusion coefficient, porosity, moisture content and thickness of each layer but also upon the order of placement. To achieve maximum flux attenuation, the least permeable material should be uppermost.
铀尾矿堆通常通过用多层土质材料覆盖来进行修复。本文推导了通过任意数量覆盖层的氡浓度分布和通量衰减的精确方程。这些方程考虑了氡在孔隙空气和水中的分布。给出的数值例子表明，在某些情况下，近似方法会产生显著误差。通量衰减系数不仅取决于每层的扩散系数、孔隙率、含水量和厚度，还取决于铺设顺序。为了实现最大的通量衰减，渗透率最小的材料应放在最上面。
