“…Cerium (Ce)-doped rare-earth garnet crystals are promising candidates for scintillation applications due to their high light yield, excellent energy resolution, and high density, such as the Gd 3 Al 2 Ga 3 O 12 :Ce (GAGG:Ce) crystal, which shows 58,000 ph./MeV of light yield, 4.9%@662 keV of energy resolution, and 6.63 g/cm 3 of density. , Moreover, GAGG:Ce also has a high effective atomic number, radiation resistance, non-self-radiating, and nonhygroscopicity properties. , Therefore, GAGG:Ce has great potential for the TOF technology of nuclear medicine imaging devices and γ detection applications . In the GAGG:Ce scintillator, although the introduction of low-valent cations such as Mg 2+ , − Ca 2+ , ,, and Li + − can significantly accelerate the scintillation decay, it also deteriorates the light yield. However, the light yield and scintillation decay can be simultaneously improved by codoping with low concentrations of Ca 2+ in the LSO:Ce crystal .…”