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在处置条件下,分别使用恒定源扩散法和背对背扩散法研究了99Tc在混合回填材料中的扩散行为。实验分别用两种方法测定了99Tc在膨润土、添加20%石英砂膨润土、1%FeO的膨润土中的扩散系数,并对其进行了讨论。结果表明,在恒定源扩散法实验中,由于大量水分子的作用,加速了99Tc在扩散材料中的扩散。另外,根据扩散实验的结果,对99Tc在缓冲回填材料膨润土中的迁移程度进行了预测,结果表
Under the condition of disposal, the diffusion behavior of 99Tc in mixed backfill material was studied by constant source diffusion method and back-to-back diffusion method respectively. The diffusion coefficients of 99Tc in bentonite, bentonite with 20% quartz sand and 1% FeO were measured by two methods respectively. The results show that in the constant source diffusion experiment, the diffusion of 99Tc in the diffusion material is accelerated due to the action of a large amount of water molecules. In addition, based on the results of the diffusion experiment, the degree of migration of 99Tc in the buffer backfill bentonite was predicted. As a result,