Solid-state scintillator detectors using the same

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The present invention provides a solid scintillator comprising a rare earth oxide sintered body, wherein : an afterglow time, which is the time required for a light output from the solid scintillator to degrease from a maximum value to 1/e of the maximum value, is 200 ns or shorter. The rare earth oxide sintered body preferably has a composition represented by a general formula (1) : LnaXbOc : Ce  (1), wherein Ln is one or more elements selected from Y, Gd and Lu; X is one or more elements selected from Si, Al and B; and a, b and c satisfy 1≰a≰5, 0.9≰b≰6, and 2.5≰≰c≰13, respectively.