Abstract
The scintillation in NaI(Tl) has been studied in the temperature range 295–375 K. The dependence of pulse height and counting efficiency on activator concentration and temperature has been investigated. At room temperature maximum pulse height is obtained for crystals having activator concentrations around the 1.5 mM fraction. It has a negative temperature coefficient of 2.25 keV/K independent of the activator concentrations except for very low values. The counting efficiency at room temperature has a flat maximum over the concentration range 1.5 to 5 mM fraction of Tl. The counting efficiency has a positive temperature coefficient which has a larger value for higher Tl concentrations. The results are qualitatively explained in terms of the dissociation of thallium dimers at elevated temperatures.
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