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PROBLEM TO BE SOLVED : To provide a highly transparent oxide crystal having high sensitivity to neutron rays, generating little background noises caused by γ-rays, and usable as a neutron scintillator. SOLUTION : There is provided oxide crystals, etc. for scintillators, expressed by structural formula (1) and having a10B content of ≥1.85 atom/nm3. Structural formula (1) is expressed by RE : Ca3(BO3)2(RE is a rare earth element). COPYRIGHT : (C)2012, JPO&INPIT