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为了研究辐射作用对膨润土性能的影响, 以改性钠基膨润土为研究对象.采用电子加速器和钴源在室温下进行辐照, 并对老化样品进行了测试.结果表明, 在累积受照剂量为5MGy, 电子辐照、γ辐照作用条件下, 改性钠基膨润土的阳离子交换容量分别为77.36meq/100g、77.89meq/100g, 分别比未辐照的改性钠基膨润土下降了3.7％和3.0％;自由膨胀体积分别为20.4mL、20.8mL, 分别比未辐照的改性钠基膨润土下降了11.3％和9.6％.电子辐照和γ辐照作用后, 导致改性钠基膨润土的阳离子交换能力下降, 吸水能力减弱, 自由膨胀能力下降.“,”In order to investigate the influence of irradiation on performance of bentonite, taking the modified Na-bentonite as object.The samples were irradiated by electron and gamma irradiation at room temperature, and then the ageing samples were tested.The results showed that:when the cumulative dose was up to 5 MGy for electron andγirradiation, the cation exchange capacities were 77.36 meq/100 g and 77.89 meq/100 g, which decreased by 3.7％ and3.0％from unirradiated modified Na-bentonite respectively.The free expansion volumes were 20.4 mL and 20.8 mL, which decreased by 11.3％ and 9.6％from unirradiated modified Na-bentonite.After electron and gamma irradiation, the cationic exchange ability of samples was reduced, the water absorption ability was weakened, and the free expansion ability was reduced.