Energy resolution and light yield non-proportionality of ZnSe : Te scintillator studied by large area avalanche photodiodes and photomultipliers

The ZnSe : Te scintillator has been studied by means of a photomultiplier with an extended bialkali photocathode, a large area avalanche photodiode (LAAPD) and a PIN photodiode. The light output was determined to be 28 300±1700 photons/MeV. Results indicate good proportionality for light output versus γ-ray energy. Measurements of the 662 keV γ-ray energy spectrum recorded using a LAAPD resulted in an energy resolution of 5.4±0.3%. Based on these results, an intrinsic energy resolution of 3.3±0.7% has been calculated.