Scintillator and radiation detector

A method of producing a scintillator, the method comprising:

• a raw material mixing step of mixing raw materials to obtain a raw material mixture;
• and
• a synthesis step of subjecting the raw material mixture to heat treatment to obtain a synthetic powder;
• the raw materials comprising at least HfO2, having a purity of not more than 99.0 mol %,
• the scintillator being a scintillator represented by the following General Formula (1), the scintillator comprising Zr, having a Zr content of not less than 1500 ppm by mass therein, and being a block of a sintered body,
• OxMyO3z, (1)
• wherein in General Formula (1), Q includes at least one or more kinds of divalent metallic elements;
• M includes at least Hf;
• and x, y, and z independently satisfy 0.5≤x≤1.5, 0.5≤y≤1.5, and 0.7≤z≤1.5, respectively.