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PROBLEM TO BE SOLVED : To provide a luminescent material for a scintillator, which has an extremely short fluorescence lifetime of subnanoseconds, and to provide a scintillator, a radiation detector and a radiation inspection apparatus using the luminescent material. SOLUTION : There is provided the luminescent material for a scintillator represented by chemical formula : (R1-xYbx)2O3 (wherein R is at least one element selected from rare earth elements consisting of Sc, Y and lanthanoid; and 0
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