Comparison of absorption, luminescence and scintillation characteristics in Lu_1.95Y_0.05SiO₅:Ce,Ca and Y₂SiO₅:Ce scintillators

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• 作者：Weerapong Chewpraditkul ; Chalerm Wanarak ; Tomasz Szczesniak ; Marek Moszynski ; Vitezslav Jary ; Alena Beitlerova ; Martin Nikl
• 关键词：LYSO ; Ce ; Ca ; YSO ; Ce ; Ce4+ center ; Scintillation decays ; Coincidence timing resolution
• 刊名：Optical Materials
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：35
• 期：9
• 页码：1679-1684
• 全文大小：1860 K

文摘

The absorption, luminescence and scintillation characteristics of Y₂SiO₅:Ce (YSO:Ce) scintillator were investigated and compared to those of Lu_1.95Y_0.05SiO₅: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 ¦Ã-rays (¹³⁷Cs 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.