同步辐射技术研究模拟高放废液中低价态鍀形态及其在玻璃固化材料中的行为

高放废液的处置已经是一个亟待解决的问题，其中的鍀因为在环境中很容易迁移而对环境的安全和人类的健康带来潜在的危险，而高放废液中的鍀处理方式有三种：从溶液中分离高鍀酸根；玻璃固化；嬗变为稳定的核素。现阶段，玻璃固化是一种较现实的方法，而鍀的形态在玻璃固化以后对环境的影响有密切的关系，高锝酸根在玻璃固化过程中的行为以及玻璃固化以后对环境的影响已经有很多的报道，但是对于低价态鍀的络合物在玻璃固化中的行为报道还很少，且又有很多的报道证明在高放废液中存在各种低价态鍀的络合物，为此本研究开展以下几个方面的研究：(1)模拟高放废液中低价态鍀络合物的合成；(2)同步辐射技术分析模拟高放废液中低价态鍀络合物的形态；(3)同步辐射分析低价态鍀络合物在玻璃固化中的行为。这些研究结果可以揭示低价态鍀络合物在玻璃固化中的行为，为高放废液的玻璃固化工艺的优化提供理论依据，同时为高放废物的安全处置奠定基础。

The remediation of HLW ( high-level liquid waste) is urgent, and technetium in HLW is harmful to environment and human being due to easy transportation in the environment. There are three methods to deal with technetium in HLW: (1)the separation of TcO4- with extraction, (2)vitrification, (3)transmutation into the stable nuclide. In the present, the vitrification is a practical method, and the species of technetium is very important to the effect on the environment after the vitrification of technetium. There are many reports about the behavior of TcO4- in the process of vitrification and the effect on the environment but less about the behavior of the lower-valent technetium complex in the process of vitrification, which was proved to exist in the HLW. Therefore, the researches are developed from the following aspects:(1)the synthesis of the lower-valent technetium complex in simulated HLW; (2)the analysis of the lower-valent technetium complex in simulation HLW by synchrotron radiation-based techniques; (3)the study on the behavior and distribution of technetium in the vitrification by synchrotron radiation-based techniques. Those researches may disclosed the behavior and distribution of technetium in the vitrification and provide with theory foundation on the optimism process of the vitrification, at same time, establish the foundations on the safety of the HLW.