Light output and energy resolution of Lu0.7Y0.3AlO3:Ce and Lu1.95Y0.05SiO5:Ce scintillators

AbstractLight output and energy resolution of Lu0.7Y0.3AlO3:Ce (LuYAP:Ce) and Lu1.95Y0.05SiO5:Ce (LYSO:Ce) single crystals with the same size were investigated for gamma ray energies ranging from 22.1 to 1,274.5 keV. The light yield and energy resolution were measured with a Photonis XP5200B PMT. For 662 keV gamma rays (137Cs source), the LYSO:Ce showed the light yield of 28,600ph/MeV,which is much higher than that of 9,800ph/MeV obtained for LuYAP:Ce. Both crystals showed comparable energy resolution of about 8%. The light yield non-proportionality and energy resolution versus energy of gamma rays were measured and the intrinsic resolution of the crystals was determined after correcting the measured energy resolution for PMT statistics. The LuYAP:Ce showed a light yield non-proportionality of about 20% upon lowering energy from 1,274.5 to 22.1 keV, which is better than that of about 29% obtained for LYSO:Ce. The experimental results of photofraction are in good agreement with the theoretical values, calculated by WinXCom program