核素衰变不仅释放高能粒子，还产生衰变子体。衰变子体在价态、离子半径等方面同母体通常存在较大差异，这将引起固化体结构、化学稳定性、耐辐照性等的改变。针对核素固化处理中多注重固化母体核素及核素衰变辐照效应，忽视衰变子体对固化体结构及稳定性的影响，提出同时考虑衰变子体与衰变释放的高能粒子共同作用对固化体结构、物相组成、稳定性等的影响。项目以90Sr、137Cs及其衰变子体的稳定同位素原位取代母体及子体，以外电子辐照模拟衰变释放的高能β-粒子，研究β粒子辐照与衰变子体共同作用下固化体的结构及稳定性。通过改变辐照剂量、固化体中子体含量，揭示共同作用对固化体结构及物理化学性能的影响机制，建立处置环境下β粒子辐照、衰变子体共同作用与固化体的结构、稳定性间的关系。该研究可为真实核素固化体的长期稳定性提供科学依据。

In the process of decay, nuclide is not only release energetic particles, but also generate new daughters. Generally, the valence state and ionic radius are different between parent and daughter, which may greatly change structure, chemical stability and high radiation resistance of solidified body. However, a lot of investigations mainly focused on the parent immobilized and irradiation effect, the influence of daughter on the solidification structure and stability usually is neglected in stability evaluation of ceramic solidified waste. The aim of this work is to reveal the combined action of daughters and energetic particles for the immobilization of 90Sr and 137Cs resulting from their decay. In this research, the parent and daughter of 90Sr and 137Cs are simultaneously immobilized by using isotope substitution, and an external electron irradiation is performed to simulate beta decay. Based on the combined action of daughters and energetic particles, the samples prepared with different daughter contents was subjected to electron irradiation for achieving the evolvement rule and mechanism of structure and stability under the combined action. The research can provide scientific basis for revealing the stability of solidified body in long-term disposal evolution.