Influence of thermal treatment on the Raman, infrared and TL responses of natural topaz
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2001
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INTERNATIONAL CONFERENCE ON RADIATION EFFECTS IN INSULATORS, 11th
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Analyses of thermoluminescence (TL) and thermally stimulated exoelectron emission have proved that the natural Brazilian topaz is a promising material for dosimetry of ionizing radiation. Topaz is an aluminum fluorosilicate with a general composition of Al2(SiO4)(F, OH)2 whose main defect is the presence of OH- groups substituting for the F- ions. Analyses of topaz samples from Santo Antonio do Jacinto, MG, Brazil, showed that their TL responses are strongly affected by the temperature of pre-irradiation thermal treatment. This behavior was correlated to the changes observed in the infrared and Raman spectra and a model could be proposed for the charge trapping and recombination process in colourless topaz.
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SOUZA, D.N.; LIMA, J.F.; VALERIO, M.E.G.; FANTINI, C.; PIMENTA, M.A.; MOREIRA, R.L.; CALDAS, L.V.E. Influence of thermal treatment on the Raman, infrared and TL responses of natural topaz. In: ALVES, E. (ed.); McHARGUE, C. (ed.). In: INTERNATIONAL CONFERENCE ON RADIATION EFFECTS IN INSULATORS, 11th, Sept. 3-7, 2001, Lisbon, Portugal. Proceedings... p. 230-235. DOI: 10.1016/S0168-583X(02)00566-9. Disponível em: http://repositorio.ipen.br/handle/123456789/16300. Acesso em: 30 Dec 2025.
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