METHOD OF INCREASING LUMINESCENCE UNIFORMITY AND REDUCING AFTERGLOW BY MEANS OF CE-DOPED GADOLINIUM-ALUMINUM-GALLIUM GARNET STRUCTURE SCINTILLATION CRYSTAL, CRYSTAL MATERIAL AND DETECTOR

摘要

A method of increasing luminescence uniformity and reducing afterglow by means of a Ce-doped gadolinium-aluminum-gallium garnet structure scintillation crystal, a crystal material, and a detector are disclosed. Sc ions are incorporated into the crystal material, and the Sc ions occupy at least an octahedral site. The effective segregation coefficient of the active Ce ions is increased by means of a radius compensation effect of Sc-Ce ions and the adjustment of unit cell parameters, thereby increasing the luminescence uniformity of the crystal and optimizing energy resolution. At the same time, the potential barrier for Gd ions entering octahedral sites is increased, reducing the probability of Gd ions entering the octahedral sites, thereby decreasing the density of point defects in the crystal and reducing the afterglow intensity of the crystal. The general formula of the Ce-doped gadolinium-aluminum-gallium garnet structure scintillation crystal is {Gd1-x-y-pScxCeyMep}3[Al1-qGaq]5O12, in which 0 < x ≤ 0.1, 0 < y ≤ 0.02, 0 ≤ p ≤ 0.02, and 0.4 ≤ q ≤ 0.7.