SOL-GEL α-Al2O3 samples: Analysis of the TL kinetics

Abstract

The analysis of the thermoluminiscence (TL) kinetics parameters of SOL-GEL α-Al2O3 with several different concentrations of impurities prepared through the solgel process is reported. A TL glow curve measured at 0.2 K/s after beta irradiation to 0.5 Gy revealed one peak at approximately 447 K. TL spectra were acquired and showed luminescent emission bands around 420 nm and 750 nm. The activation energies, the frequency factors, and the kinetic order involved in the TL emission were evaluated using the maximum peak temperature response, the peak shape of the TL glow curve, the TL glow curve area, and the glow curve fitting methods. The order of kinetics of the peak was evaluated as first order using TM dependence on the radiation dose. The (TM-Tstop) technique was used for determining the number of peaks in the glow curve. The activation energies obtained are in agreement with all the applied methods. The activation energy calculated by various methods varied from 0.885 ± 0.008 eV to 1.05 ± 0.10 eV. The frequency factor determined by all methods was of the order of 109 s-1. The dosimetric peak is affected by thermal quenching. The following thermal quenching parameters were estimated: the activation energy of the thermal quenching W = 1.05 ± 0.15 eV and the constant C = 8.27 × 1010 s-1. The trapping parameters of SOL-GEL α-Al2O3 detectors are reported in the present work for the first time.