Study of Environmental Chemical Species and Underground Migration Behavior of TRU

In order to know地下迁移（RTU） Which is important for the security assessment of high level radioactive wastes， their adsorption behavior onto rocks and hydrolysis reactions were investigated in the present study。（1） For the adsorption behavior of radionuclides onto rocks， experiments were performed with some adsorbates（Csy D1+ y D1，Sry D12 + y D1， Ba y D12+ y D1， En y D13+ y D1， Am y D13 + y D1， etc. ）and typical adsorbents （quartz， rganite， etc. ）to study the applicability of the electric double layer model to adsorption reactions of TRU。通过模型和获得的热同步均衡器常数对测量的数据进行了很好的分析，从一个系统点对预测未知值的视图进行了分析。（2）由于对氢化和活性化合物的复合的热力学数据的改进，溶解度测量和时间解析的激光诱导的荧光测量对U（VI）在碱性解决方案中的表现，以及Uo-I-D22-（OH）I-D2-（/） 4 I-D3最近确定了，U（VI）羟基物种的协调性质已经被讨论过。（3）Furthermore，活性离子的水合物常数是通过使用一种改进的硬球体模型来分析的，其中活性离子的有效电荷是被认为的。在对常规电静态交互的补充中，找到了非电静态交互以促进这些氢化物种类的稳定性。

In order to know underground migration of transuranium elements (TRU) which is important for the safety assessment of geologic disposal of high level radioactive wastes, their adsorption behavior onto rocks and hydrolysis reactions were investigated in the present study.(1) For the adsorption behavior of radionuclides onto rocks, experiments were performed with some adsorbates(CsィイD1+ィエD1, SrィイD12+ィエD1, BaィイD12+ィエD1, EnィイD13+ィエD1, AmィイD13+ィエD1, etc. )and typical adsorbents (quartz, rganite, etc. )to study the applicability of the electric double layer model to adsorption reactions of TRU. The measured data were well analyzed by the model and the obtained thermodynamic equilibrium constants were discussed from a systematic point of view for predicting the unknown values.(2)For the improvement of thermodynamic data on hydrolysis and complexation of actinide ions, the solubility measurement and the time-resolved laser induced fluorescence measurement were performed of U(VI) in alkaline solutions, and the hydrolysis constant for UoィイD22ィエD2(OH)ィイD32-(/) 4ィエD3was newly determined, and the coordination properties of U(VI) hydrolysis species were discussed.(3)Furthermore, the hydrolysis constants of actinide ions were analyzed by using an improved hard sphere model in which the effective charges of actinide ions were considered. In addition to ordinary electrostatic interactions, non-electrostatic interactions were found to contribute to the stability of the hydrolysis species of these ions.