Abstract
The 150 °C and 290 °C thermoluminescence (TL) peaks in CaCO3:Ce were attributed to generically related traps. TL process in calcites arises from O2− interstitial ions and anion vacancies created during pre-sintering which serve as hole traps and electron traps, respectively. The TL response of CaCO3:Ce is supralinear in the dose range 0.5–5 kGy due to secondary electron track interaction and sublinear beyond 5 kGy due to saturation of traps. The charge state surrounding a cation vacancy and Oi2− in CaCO3:Ce3+ can be considered as 3- (2- from oxygen and 1- from Ce3+) since Ce3+ is prone to oxidation to Ce4+ state which increases 2-track interaction during γ-irradiation at high doses and 2-hole trapping by densely ionizing radiations. TL of CaCO3:Dy is dominated by Dy3+ emission (480 and 570 nm) and a linear TL response with dose in the range 0.5–15 kGy since track interaction probability is less.
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