Investigations of thermoluminescence properties of multicrystalline LiF: Mg,Cu, Si phosphor prepared by edge defined film fed growth technique |
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| Affiliation: | 1. Research Center for New Generation Photovoltaics, National Central University, Taoyuan 32001, Taiwan, ROC;2. Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan, ROC;3. Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, ROC;4. Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan, ROC;5. Department of Chemistry, National Central University, Taoyuan 32001, Taiwan, ROC;1. Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK;2. Department of Chemistry, University of Oslo, FERMiO/SMN, Gaustadalléen 21, NO-0349 Oslo, Norway;1. LUSAC EA 4253, UNICAEN, Rue Aragon, 50130 Cherbourg, France;2. CRISMAT UMR 6508-CNRS, UNICAEN, 6Bd Maréchal Juin, 14050 Caen Cedex 4, France;3. Fac de Ciências e Tecnologia–FCT, Univ Estadual Paulista – UNESP, P.O Box 467, Presidente Prudente, SP, 19060-900, Brazil |
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| Abstract: | Thermoluminescence (TL) properties of LiF: Mg, Cu, Si phosphor prepared in multicrystalline form using edge defined film fed growth (EFG) technique has been investigated. The effect of preparation route on TL properties and thermal stability has been studied. To improve the TL dosimetry properties, phosphor is subjected to different annealing temperatures ranging from 250 °C to 450 °C. The shape of the glow curve structure and peak temperature remains similar at different annealing temperatures, however peak intensities vary. The consistency in the glow curve structure with annealing temperature elucidate that TL trapping states are stable in nature. Thermal annealing at 300 °C for 10 min gives maximum TL intensity with main dosimetry peak at 209 °C. The TL intensity of the main dosimetry peak is increased by a factor of five as compared to as-grown crystal. The thermal stability of LiF: Mg, Cu, Si is found to be better than LiF: Mg, Cu, P. Trapping parameters are calculated to have an insight study of defect states. A simple glow curve structure, tissue equivalency, thermal stability, low residual signal, linear response and reusability makes LiF: Mg, Cu, Si a suitable phosphor for radiation therapy, radio diagnostics and personnel dosimetry applications. |
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| Keywords: | Thermoluminescence dosimetry Edge defined film fed growth technique Phosphor Tissue equivalence Thermal annealing |
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