Comparative studies of Lu3Al5O12:Ce and Y3Al5O12:Ce scintillators for gamma-ray detection

✍ Scribed by Chewpraditkul, W. ;Swiderski, L. ;Moszynski, M. ;Szczesniak, T. ;Syntfeld-Kazuch, A. ;Wanarak, C. ;Limsuwan, P.

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 464 KB
• Volume: 206
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925161

✦ Synopsis

Abstract

The performance of Lu~3~Al~5~O~12~:Ce (LuAG:Ce) and Y~3~Al~5~O~12~:Ce (YAG:Ce) scintillators were compared under γ‐ray excitation using photomultiplier tube (PMT) readout. Light yield non‐proportionality and energy resolution were measured with a Photonis XP5500B PMT. The energy resolution, obtained in this work for 662 keV γ‐rays, was 6.7 and 7.0%, respectively, for LuAG:Ce and YAG:Ce detectors. A fast component in the scintillation decay of LuAG:Ce crystal is faster than that of YAG:Ce crystal, whereas the relative intensity of a fast component for YAG:Ce crystal is higher than that of LuAG:Ce crystal. The coincidence time resolution, obtained in this work for 511 keV annihilation quanta, was 583 and 660 ps, respectively, for LuAG:Ce‐ and YAG:Ce‐based detectors in coincidence experiment together with a BaF~2~ scintillation detector. Normalized coincidence time resolution was also discussed in terms of a number of photoelectrons and decay time of the light pulse.