- Title
- Thermoluminescence of annealed synthetic quartz: the influence of annealing on kinetic parameters and thermal quenching
- Creator
- Dawam, Robert R, Chithambo, Makaiko L
- Date
- 2018
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/110050
- Identifier
- vital:33218
- Identifier
- https://doi.org/10.1016/j.radmeas.2018.06.004
- Description
- The thermoluminescence of synthetic quartz annealed at various temperatures up to 900 °C is reported. Glow curves measured at 1 oCs−1 following beta irradiation to 40 Gy from a sample annealed at 500 °C and from an unannealed one consist of a prominent peak at 70 °C and secondary peaks at 110, 180 and 310 °C. In comparison, the glow peak from the sample annealed at 900 °C consists of three peaks but with the main peak at 86 °C and other lower intensity peaks at 170 and 310 °C. Kinetic analysis was carried out on the main peak only in each case. The order of kinetics of this peak was determined to be first order using various methods. The activation energy was evaluated as an average of 0.90±0.02eV for the unannealed sample and the one annealed at 500 °C. However, when the synthetic quartz is annealed at 900 °C, the activation energy decreases to 0.65±0.02eV. The main point of interest however concerns thermal quenching. It was noted that for the sample annealed at 500 °C as well as the unannealed one, the maximum intensity of the main peak decreases with heating rate. This phenomenon is associated with thermal quenching. When the same experiment is carried out using quartz annealed at 900 °C and irradiated to the same dose, namely 40 Gy, the intensity increases with heating rate. This would imply that this sample is not affected by thermal quenching. Using the notion that the radiative and non-radiative recombination routes are competitive, we repeated the experiment using a low dose of 3 Gy. In this case, the intensity decreased with heating rate showing that the process can be tuned. The activation energy for thermal quenching for the samples annealed at 900 °C, 500 °C and unnannealed one was found as 0.65±0.02eV, 0.82±0.02eV and 0.95±0.06eV. Evidently, annealing affects recombination processes in synthetic quartz.
- Format
- 6 pages, pdf
- Language
- English
- Relation
- Radiation Measurements, Dawam, R.R. and Chithambo, M.L., 2018. Thermoluminescence of annealed synthetic quartz: The influence of annealing on kinetic parameters and thermal quenching. Radiation Measurements, 120, pp.47-52., Radiation Measurements volume 120 47 52 December 2018 1350-4487
- 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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RU Department of Physics and Electronics
Chithambo, Makaiko Liwiro (Distinguished Prof)
SDG 09. Industry, Innovation and Infrastructure
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