Improvement of ceramic YAG(Ce) scintillators to (YGd)₃Al₅O₁₂(Ce) for gamma-ray detectors

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• 作者：Takayuki Yanagida ; Takeshi Itoh ; Hiromitsu Takahashi ; Shinya Hirakuri ; Motohide Kokubun ; Kazuo Makishima ; Mistuhiro Sato ; Teruaki Enoto ; Takagimi Yanagitani ; Hideki Yagi ; Takashi Shigetad ; Takashi It
• 关键词：Ceramic scintillator ; YAG ; GYAG ; APD ; Stopping power ; Gamma-rays
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2007
• 出版时间：21 August 2007
• 年：2007
• 卷：579
• 期：1
• 页码：23-26
• 全文大小：534 K

文摘

Based on our successful development of ceramic Y₃Al₅O₁₂(Ce) scintillators, we fabricated two samples of (YGd)₃Al₅O₁₂(Ce) scintillator, to achieve higher stopping power to gamma-rays. They are both activated with Ce to a 0.5 mol % concentration, but differ in sintering conditions. We investigated their optical properties and gamma-ray responses. One of them showed a poor (1 % ) optical transparency at 550 nm, while the other had a much improved (20 % ) transmission. They both showed a dominant decay constant of 90 ns, when irradiated with gamma-rays. The more transparent one exhibited light yield which is 30 % of that of ceramic YAG(Ce), and 14 % (FWHM) energy resolution at 662 keV when coupled with a phototube. When coupled with an avalanche photo diode, it exhibited 8 % energy resolution at the same energy. The stopping power of the new ceramics was confirmed to be five times as high as that of YAG(Ce) at 660 keV, by counting detected photo-absorption events.