Influence of thermal treatment on the Raman, infrared and TL responses of natural topaz
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2001
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REGIONAL CONGRESS ON RADIATION PROTECTION AND SAFETY, 5th, REGIONAL IRPA CONGRESS
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Resumo
Analyses of Thermoluminescence (TL) and Thermally Stimulated Exoelectron
Emission (TSEE) 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 to the OH-
groups
substituting for the F-
ion. 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 colorless topaz.
Como referenciar
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: REGIONAL CONGRESS ON RADIATION PROTECTION AND SAFETY, 5th, REGIONAL IRPA CONGRESS, Apr. 29 - May 4, 2001, Recife, PE. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/16324. Acesso em: 24 Mar 2026.
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