Comparison of Lu1.8Y0.2SiO5:Ce and LaCl3:Ce Scintillators in Gamma-Ray Spectrometry
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Abstract
The scintillation response of Lu1.8Y0.2SiO5:Ce (LYSO:Ce) and LaCl3:Ce scintillators were compared under Gamma ray excitation using photomultiplier tube (PMT) readout. For 662 keV Gamma rays (137 Cs source), energy resolution of 4.5±0.2% obtained for LaCl3:Ce coupled to XP5200B PMT is much better than that of 8.2±0.4% for LYSO:Ce. The estimated photofraction of 26.1% at 662 keV for LYSO:Ce is higher than that of 15.7% for LaCl3:Ce. The non-proportionality of the light yield and energy resolution versus Gamma ray energy were measured and the intrinsic resolution of the crystals was calculated. Special attention was devoted to the correlation between intrinsic resolution and non-proportional response of scintillators.
Keywords : Energy Resolution / Intrinsic Resolution / LaCl3:Ce, LYSO:Ce / Non-proportionality of the Light Yield / Photofraction / Scintillator