Abstract
Recent study revealed that single crystal Ce:Gd3(Al,Ga)5O12 (Ce:GAGG) showed good scintillation response under γ-ray exposure. We discover here that ceramic Ce:GAGG scintillator exhibited better performance than the single crystal counterpart. We developed Ce 1% doped ceramic and single crystal GAGG scintillators with 1mm thick and compared their properties. In radioluminescence spectra, they showed intense emission peaking at 530nm due to Ce3+ 5d–4f transition. The 137Cs γ-ray induced light yields of ceramic and single crystal resulted 70000ph/MeV and 46000ph/MeV with primary decay times of 165 and 143ns, respectively. At present, the observed light yield was the brightest in oxide scintillators.
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