- Title
- Thermally-assisted optically stimulated luminescence from deep electron traps in α-Al2O3: C, Mg
- Creator
- Kalita, Jitumani M, Chithambo, Makaiko L, Polymeris, G S
- Date
- 2017
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/116133
- Identifier
- vital:34322
- Identifier
- https://doi.org/10.1016/j.nimb.2017.04.075
- Description
- We report thermally-assisted optically stimulated luminescence (TA-OSL) in α-Al2O3:C,Mg. The OSL was measured at elevated temperatures between 50 and 240 °C from a sample preheated to 500 °C after irradiation to 100 Gy. That OSL could be measured even after the preheating is direct evidence of the existence of deep electron traps in α-Al2O3:C,Mg. The TA-OSL intensity goes through a peak with measurement temperature. The initial increase is ascribed to thermal assistance to optical stimulation whereas the subsequent decrease in intensity is deduced to reflect increasing incidences of non-radiative recombination, that is, thermal quenching. The activation energy for thermal assistance corresponding to a deep electron trap was estimated as 0.667 ± 0.006 eV whereas the activation energy for thermal quenching was calculated as 0.90 ± 0.04 eV. The intensity of the TA-OSL was also found to increase with irradiation dose. The dose response is sublinear from 25 to 150 Gy but saturates with further increase of dose. The TA-OSL dose response has been discussed by considering the competition for charges at the deep traps. This study incidentally shows that TA-OSL can be effectively used in dosimetry involving large doses.
- Format
- 5 pages, pdf
- Language
- English
- Relation
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Kalita, J.M., Chithambo, M.L. and Polymeris, G.S., 2017. Thermally-assisted optically stimulated luminescence from deep electron traps in α-Al2O3: C, Mg. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 403, pp.28-32., Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms volume 403 28 32 July 2017 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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