Dosimetric and optical properties of CaSO4:Tm and CaSO4:Tm,Ag crystals produced by a slow evaporation route
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2019
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Journal of Luminescence
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The motivation of this work was to produce TL dosimeters based on crystals of CaSO4 doped with thulium and
silver, by means of a suitable new route. The crystals were produced by an adaptation of the slow evaporation
route using calcium carbonate (CaCO3) as precursor, and incorporating the dopants (Tm2O3 and silver nanoparticles)
in a solution of sulfuric acid, which is evaporated resulting in CaSO4:Tm or CaSO4:Tm,Ag crystal
powders. X-ray diffraction analyses showed that the produced samples exhibit only a single phase corresponding
to the crystal structure of anhydrite. Optical characterization was performed to determine the band gap of the
materials. Samples did not show a reasonable OSL signal after stimulation with blue LEDs. TL characteristics
such as glow curves, linearity and reproducibility of response, minimum detectable dose and fading were
evaluated. The CaSO4:Tm samples showed TL emission glow curves with peaks in temperatures proper for dosimetry.
The CaSO4:Tm,Ag samples presented a very intense peak displaced to high temperatures that could only
be observed by applying heating rates below 4 °C/s. Samples doped with thulium oxide and silver nanoparticles
showed the highest TL intensity and lowest fading.
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JUNOT, DANILO O.; SANTOS, ANA G.M.; ANTONIO, PATRICIA L.; REZENDE, MARCOS V.S.; SOUZA, DIVANIZIA N.; CALDAS, LINDA V.E. Dosimetric and optical properties of CaSO4:Tm and CaSO4:Tm,Ag crystals produced by a slow evaporation route. Journal of Luminescence, v. 210, p. 58-65, 2019. DOI: 10.1016/j.jlumin.2019.02.005. Disponível em: http://repositorio.ipen.br/handle/123456789/30062. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.