The univalent ions are doped garnet scintillator

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Codoped rare earth garnet-type oxide scintillators are described. More particularly, the scintillators include lutetium yttrium aluminum garnet (LuYAG)-type materials that are doped with an activator, such as praseodymium, and codoped with a monovalent cation, such as lithium. Radiation detectors comprising the scintillators, methods of detecting higher energy radiation using the scintillators, and methods of preparing the scintillators and altering scintillator properties are also described.