Thermoluminescence of aluminum oxide co-doped with terbium and thulium obtained via combustion synthesis

Add time:07/23/2019    Source:sciencedirect.com

In this work thermoluminescent properties of α-Al2O3 samples doped with Tb3+ and Tm3+, prepared by the combustion synthesis route, were studied. Samples were prepared by mixing stoichiometric amounts of aluminum nitrate, urea and dopants with different amounts of terbium and thulium nitrates varying from 0 to 0.15 mol%. The mixture was ignited in a muffle furnace at low temperature (500 °C). After the combustion, the samples were sintered at 1400 °C for 4 h in order to obtain the pure α-phase crystalline structure. The TL response of these samples for Co-60 gamma radiation was evaluated. It was observed a TL glow peak around 220 °C and a linear response for doses in studied range of 0.1–1 Gy. It was observed that the 0.1 mol% concentrations of both dopants present the highest TL sensitivity. The sensitivity of the co-doped (0.10 mol%) samples is 5 times higher than the 0.1 mol% Tm-only doped Al2O3 and 40 times higher than the sample doped only with 0.1 mol% of Tb. These results strongly suggest that the Al2O3:Tm–Tb, prepared through the combustion method, is a potential material for TL radiation dosimetry.

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