A scintillator, a scintillator array, a radiation detector, the radiation device

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A scintillator comprises a sintered body having a volume of 1 mm 3 or less. The sintered body includes a crystal region of a rare earth oxysulfide. The number of polycrystal bodies each having a different composition from that of the crystal region is 200 or less per a unit area of 100 µm × 100 µm of a cross section of the sintered body.