The scintillation efficiency of NaI(Tl) crystals, containing Tl concentration of 0.01, 0.07 and 0.22 mole%, 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 d E / d x 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.
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Kubota et al. (2000) studied this question.
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