摘要
研究了￣（１２５）Ⅰ（模拟裂片核素￣（１２９）Ⅰ）在花岗岩中的吸附动力学，结果表明在实验条件下￣（１２５）Ⅰ吸附极少。由测得的渗透曲线和流量曲线经物料衡算，求得岩石输出浓度与时间的关系曲线。利用分布函数性质，求得纵向弥散系数Ｄ、孔隙流速ｖ和有效孔隙率ε＿ｅ。提出了￣（１２９）Ⅰ在花岗岩中迁移的数学模型方程，并求解得到核素浓度随时空变化的分析解和数值解。
The adsorption kinetics of ￣(129)Ⅰ in granite is studied with ￣(125)Ⅰcomcentration in the effluxsorption is found to be negligibly small.The time dependence of ￣(125)Ⅰcomcentration in the effluxfrom a granite layer is deduced from the measured penetration and flow curves by materialbalance calculation.Using the property of the distribution function,the longitudinal dispersioncoefficient,the interstitial flow velocity nd the effective interstice fraction are obtained.Adiffer-ential equation describing the migration of ￣(129)Ⅰin granite is suggested,and both analytical andnumerical solutions to the eguation are given.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1994年第3期129-134,共6页
Journal of Nuclear and Radiochemistry
基金
核科学基金
