Abstract
Thermoluminescence (TL) of X-irradiated KCl single crystals containing different concentrations of yttrium is studied in the temperature range 30–250 °C, in which the TL intensity is found to decrease with increasing yttrium concentration. In all the yttrium-doped KCl crystals, the TL glow curves show three glow peaks: T 1 peak (85–100 °C), T 2 peak (115–120 °C) and T 3 peak (160–180 °C). Annealing of the irradiated crystals doped with 1 mol.% yttrium shows the elimination of the T 1 peak whereas the F-bleaching of the irradiated crystal at room temperature increases the intensity of the T 2 peak while decreasing the intensities of the other glow peaks. From these observations, the T 1 peak is attributed to background impurities, the T 2 peak to yttrium-related centres and the T 3 peak to F-centres. The trap depths corresponding to these glow peaks are calculated using various peak methods.
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