Energy and Timing Resolutions of Ce3+ - Doped Lu3Al5O12, Lu2SiO5 and LaBr3 Single Crystal Scintillators

Abstract

The performances of Ce-doped Lu₃Al₅O₁₂ (LuAG:Ce), Lu₂SiO₅ (LSO:Ce) and LaBr₃ (LaBr₃:Ce)single crystal scintillators were compared for γ-ray detection. For 662 keV γ-rays (137Cs source), an energyresolution of 3.5% obtained for LaBr₃:Ce coupled to XP5500B PMT is much better than that of 6.7% and 8.3%, respectively, for LuAG:Ce and LSO:Ce, while its photofraction is worse than that of LuAG:Ce andLSO:Ce. The light yield non-proportionality and energy resolution versus γ-ray energy were measured andthe intrinsic resolution of the crystals was calculated. The coincidence timing resolution, obtained in thiswork for 511 keV annihilation quanta, was 204, 212 and 583 ps, respectively, for LaBr₃:Ce-, LSO:Ce- andLuAG:Ce-based detectors in coincidence experiment together with a BaF₂ detector.

Keywords : Energy and Time Resolution / LaBr₃:Ce / LuAG:Ce / LSO:Ce /Non-proportionality of Light Yield / γ- Ray Detection / Photofraction / Scintillator