Thermoluminescence of α-Al2O3: C, Mg annealed at 1200° C

Kalita, Jitumani M; Chithambo, Makaiko L

Title: Thermoluminescence of α-Al2O3: C, Mg annealed at 1200° C
Creator: Kalita, Jitumani M
Creator: Chithambo, Makaiko L
Date Issued: 2018
Date: 2018
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/111030
Identifier: vital:33365
Identifier: https://doi.org/10.1016/j.nimb.2018.03.003
Description: Stimulated luminescence in α-Al2O3:C,Mg has thus far been studied for samples annealed at temperature no higher than 900 °C as can be seen by an examination of the literature. We report the thermoluminescence (TL) features of α-Al2O3:C,Mg annealed at 1200 °C. A glow curve measured at 1 °C/s from the samples annealed at 1200 °C shows eight peaks at 54, 80, 102, 173, 238, 290, 330 and 387 °C. Kinetic analyses show that the peak at 54 °C follows general order kinetics (b = 1.3) whereas the rest follow first order kinetics. The values of the activation energy of the peaks are between 0.77 eV and 1.90 eV and the frequency factors are of the order of 1010–1014 s−1. The intensity of the peaks at 54, 80, 102 and 173 °C increase with heating rate whereas those of the peaks at 238 and 290 °C decrease with heating rate. The decrease of intensity of the peaks at 238 and 290 °C with heating rate is due to thermal quenching whereas the increase of intensity of the peaks with heating rate indicates an inverse thermal-quenching-like behaviour. Interestingly this behaviour is observed only after annealing at 1200 °C. The activation energy for thermal quenching as calculated using the peaks at 238 and 290 °C are (1.02 ± 0.16) eV and (1.33 ± 0.15) eV respectively. Regarding the dosimetric features, the dose response of the peaks at 54, 80 and 102 °C are sublinear within 1–10 Gy and the peak at 54 °C saturates above 6 Gy. In contrast, the response of the peak at 173 °C is sublinear with 1–4 Gy and superlinear between 4 and 10 Gy. The peaks are found to fade at different rates and the rate of fading is also affected by annealing.
Format: 7 pages
Format: pdf
Language: English
Relation: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Relation: Kalita, J.M. and Chithambo, M.L., 2018. Thermoluminescence of α-Al2O3: C, Mg annealed at 1200° C. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 422, pp.78-84.
Relation: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms volume 422 78 84 1 May 2018 0168-583X
Rights: Elsevier
Rights: Use of this resource is governed by the terms and conditions of the Science Direct Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)

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