铈掺杂的钆镓铝石榴石（Ce:GGAG）闪烁陶瓷是目前CT探测器用的关键候选材料。在探测器各项性能指标中，闪烁材料的光产额不仅关系到探测器的精度与空间分辨率，而且决定着X射线剂量及其对人体的伤害程度。然而目前关于闪烁陶瓷的能量传输机制，以及结构缺陷对光产额的具体作用机理解释还有待提高。本项目基于GGAG陶瓷材料制备及工艺稳定的前期工作基础，将深入研究高能射线激发下，能量在材料内部的传输特性；探索氧空位、晶界等缺陷对光产额的影响机制；借助第一性原理计算方法，提出抑制内部缺陷的可行方案，为实现光产额的进一步提高提供理论依据；并为GGAG闪烁陶瓷实现CT探测器的实际应用打下坚实的基础。

Cerium doped gadolinium gallium aluminum garnet (Ce:GGAG) ceramic scintillators are kinds of key candidate materials for CT detector. Among all the performance indicators for detectors, light yield of scintillation materials are not only related to the measurement accuracy and the spatial resolution of the detector, but also determine the X-ray dose and the injury degree of human bodies. However, the interpretation for energy transfer mechanism of ceramic scintillators, and the specific influence mechanism of its structure defects on light yield remain to be improved. Based on previous research work to stabilize the synthesis process of GGAG ceramic material, this project will deeply investigate the energy transfer characteristics under high energy radiation excitation. The influence mechanism of defects, such as oxygen vacancy and grain boundary, on the light yield will also be explored. In addition, feasible approach to control the internal defects will be proposed with the help of the first-principles calculations, and theoretical support to further improve the light yield will be provided. Moreover, this project will build a solid foundation for GGAG ceramic scitnillators to be applied in real CT detectors.