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Yagi, Hideki
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article
Improvement of ceramic YAG(Ce) scintillators to (YGd) <SUB>3</SUB>Al <SUB>5</SUB>O <SUB>12</SUB>(Ce) for gamma-ray detectors
Abstract
Based on our successful development of ceramic Y <SUB>3</SUB>Al <SUB>5</SUB>O <SUB>12</SUB>(Ce) scintillators, we fabricated two samples of (YGd) <SUB>3</SUB>Al <SUB>5</SUB>O <SUB>12</SUB>(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.