Journal
OPTICAL MATERIALS
Volume 35, Issue 9, Pages 1679-1684Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2013.04.024
Keywords
LYSO:Ce,Ca; YSO:Ce; Ce4+ center; Scintillation decays; Coincidence timing resolution
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Funding
- King Mongkut's University of Technology Thonburi (KMUTT) under the NRU Project of Thailand's Office of the Higher Education Commission
- Czech Science Foundation [P204/12/0805]
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The absorption, luminescence and scintillation characteristics of Y2SiO5:Ce (YSO:Ce) scintillator were investigated and compared to those of Lu1.95Y0.05SiO5:Ce,Ca (LYSO:Ce,Ca) scintillator. Due to the Ca2+ co-doping in LYSO:Ce quantified by GDMS analysis, the Ce4+ center is evidenced in the absorption spectra. For 662 keV gamma-rays (Cs-137 source), YSO:Ce shows a light yield of 15,300 ph/MeV, which is much lower than that of 32,000 ph/MeV obtained for LYSO:Ce,Ca. The coincidence timing resolution for 511 keV annihilation quanta of 234 and 478 ps was obtained, respectively, for LYSO:Ce,Ca and YSO:Ce detectors in coincidence experiment using a BaF2-based detector. Time resolution was also discussed in terms of a number of photoelectrons and decay time of the scintillation pulse. (C) 2013 Elsevier B.V. All rights reserved.
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