Scintillation Process in NaI(Tl): Comparison with Scintillation Models

Abstract

The scintillation efficiency of NaI(Tl) crystals, containing Tl concentration of 0.01, 0.07 and 0.22mole%, has been measured under electron, alpha particle and fission fragment excitations. The purpose of this program was to provide a critical test of previously proposed models of the scintillation process in activated alkali halides. It is found that the shape of the scintillation efficiency versus dE/ dx for the three different Tl concentrations is dependent on Tl concentration. The measured scintillation efficiency is compared with the scintillation models for thallium-activated alkali halides proposed by Birks, and Murray and Meyer.