SCINTILLATOR, SCINTILLATOR ARRAY, RADIATION DETECTOR, AND RADIATION EXAMINATION DEVICE

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A scintillator which comprises a sintered object that has a volume of 1 mm3 or less and has crystal regions of a rare-earth oxysulfide. In a cross section of the sintered object, the number of polycrystalline grains having a composition which differs from that of the crystal regions is 200 or less per unit area of 100 µm × 100 µm.