【摘要】 为了确认γ辐照对高庙子天然钠基膨润土在北山地下水中溶解性的影响,拓展高放地质处置缓冲材料性能的评价范围,以内蒙古高庙子天然钠基膨润土和北山地下水为研究对象,分析了经不同γ辐照剂量（500kGy、1000kGy、1500kGy、2000kGy、2500kGy和3000kGy）照射后天然钠基膨润土在北山地下水中溶解平衡后液相中K⁺、Na⁺、Ca²⁺、Mg²⁺、F^-、Cl^-、SO₄^2-和SiO₃^2-浓度的变化。结果表明:SiO₃^2-浓度随着辐照剂量的增加而持续增加,其他离子浓度在低剂量（500kGy）条件下变化不大,较大剂量下会增加;膨润土能够吸附北山地下水中的离子,但辐照剂量1000kGy以上时,K⁺、Ca²⁺、Mg²⁺和F^-吸附容量显著降低,Na⁺、Cl^-和SO₄^2-吸附能力完全丧失,开始向北山地下水中溶解。总体而言,γ辐照引起了高庙子天然钠基膨润土结构和组成的变化,其阈值在500～1000kGy之间。更多还原

【Abstract】 The impact ofγradiation on the dissolution of GMZ Na-bentonite in Beishan groundwater was demonstrated,and broaden the assessment and scope of buffer materials for geological disposal of high-level radioactive waste（HLW）in line with the rapid advancement of HLW repository research.The concentrations of K⁺,Na⁺,Ca²⁺,Mg²⁺,F^-,Cl^-,SO₄^2- and SiO₃^2- in liquids after the solution equilibrium between Na-bentonite from Gaomiaozi area,Inner Mongolia,China under accumulative radiation with doses at 500kGy,1000kGy,1500kGy,2000kGy,2500k Gy and 3000kGy,respectively and groundwater from Beishan area,Gansu,China were analyzed.Results shown that,the concentration of SiO₃^2- increased with the increase ofγradiation exposure dose.The concentration of other ions increased with the increase ofγradiation exposure dose that exceed 500kGy.As well,the ions in groundwater were adsorbed by bentonite,but the adsorption capability of K⁺,Ca²⁺,Mg²⁺and F^-in bentonite were reduced,obviously and the adsorption capability of Na⁺,Mg²⁺,Cl^-,and SO₄^2- were lost,when theγradiation exposure dose surpass1000kGy.In general,the microstructure and composition of Gaomiaozi Na-bentonite were changed,the threshold value of exposure dose located in 500～1000kGy.更多还原