Comparative study on the effect of annealing treatments on RTL mechanism in natural quartz from different origins

The behaviour of trap centres and luminescence centres has been investigated for fired and unfired natural quartz from bricks and sediments irradiated at 100 Gy and annealed at different temperatures in the range 350-700 °C. The annealing treatment affects thermoluminescence (TL) glow curve as various changes were observed. The higher sensitization occurred for an annealing in the region 550-600 °C. At this annealing temperature, it has been observed the emergence of two peaks arising at 96 and 180 °C. At lower annealing temperatures, these peaks are overlapped by the peaks localized at 90 and 195 °C, respectively. Concerning the fired quartz, the higher sensitization occurred for an annealing in the region 500-550 °C for peak temperature around 200 °C and an unusual desensitization for the peak temperature around 100 °C. The behaviour of the two types of quartz is analyzed regarding to their kinetic parameters and luminescence emission and compared to literature data.