High counting rate scintillator

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[PROBLEMS] To provide a scintillator responding to high counting rate sustaining high-speed and high detection efficiency of BaF 2 and to provide a radiation detection device with high time resolution by using the scintillator. [MEANS FOR SOLVING PROBLEMS] A specified amount of rare earth element (Eu) is doped into BaF 2 to reduce long decay lifetime component (600 to 620 nm), leaving fast decaying component (0.6 to 0.8 ns) of BaF 2 luminescence unchanged. The present invention is a high counting rate scintillator for detecting radiation comprising BaF 2 doped with rare earth elements (Eu), wherein the doping amount is in the range of 0.02 to 1.0 mol%.