Gamma-ray Energy Dependence of Scintillation Decay Time

We investigated scintillation decay times at different excitation γ-ray energies for commercial luminescent materials such as Ce:LaBr 3 , Eu:SrI 2 , Ce:LYSO [(Y,Lu) 2 SiO 5 ], and Ce:GAGG [Gd 3 (Al,Ga) 5 O 12 ].Ce:LaBr 3 and Eu:SrI 2 did not show energy dependence, whereas Ce:LYSO and Ce:GAGG exhibited different decay curves at different excitation energies.In these materials, the energy dependence of decay correlated with the nonproportionality of scintillation light yield.