The present invention provides an inorganic scintillator including a matrix material comprising a metal oxide, and a luminescence center made of Ce contained in the matrix material, the inorganic scintillator being adapted to scintillate in response to a radiation; wherein the matrix material further comprises a dopant having a tetravalent ionization energy I [kJmol.sup.-1] satisfying the condition represented by the following expression (1): 3000.ltoreq.I.ltoreq.3500. (1)