为了获取关键核素在北山花岗岩中的有效扩散系数,依据~(125)Ⅰ~-在甘肃北山深部花岗岩中的一维扩散曲线,用参数拟合方法得到了~(125)Ⅰ~-在北山花岗岩中的有效扩散系数,并依据扩散方程讨论了衰变和吸附对扩散曲线的影响。研究结果表明,衰变常量和吸附速率常数对一维扩散曲线的影响各不相同,衰变常量的大小影响扩散曲线的形状,吸附速率常数的大小则影响扩散曲线的走势,不同核素的扩散曲线可有很大的差别。 In order to obtain the effective diffusion coefficient of key radionuclides in Beishan granite, a ~ (125) Ⅰ ~ - ~ (125) Ⅰ ~ was obtained from the one-dimensional diffusion curve of ~ (125) Ⅰ ~ ~ in deep granite of Beishan, Gansu. The effective diffusion coefficient in granite, and the influence of decay and adsorption on the diffusion curve is discussed according to the diffusion equation. The results show that the decay constants and adsorption rate constants have different effects on the one-dimensional diffusion curves. The decay constants affect the shape of the diffusion curves. The adsorption rate constants affect the diffusion curves. The diffusion curves of different nuclides There is a big difference.