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PROBLEM TO BE SOLVED : To provide : a scintillator material with high quantum efficiency which can be a safe alternative substance of CWO; and an X-ray detector. SOLUTION : A scintillator material is used which comprises a fluoride single crystal expressed by chemical formula M1-xRExF2+x-w. In the chemical formula, M is one or more group 2 metal element(s) selected from the group of Be, Mg, Ca, Sr and Ba; RE is a rare-earth element; and 0
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