TL and OSL characterization of CaSO4:Tb, CaSO4:Mn AND CaSO4:Mn,Tb phosphors
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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The objective of this work was to investigate the luminescence properties of CaSO4:Tb,
CaSO4:Mn e CaSO4:Mn,Tb synthesized by slow evaporation route. The crystalline structure, morphology,
thermal and optical properties of the phosphors were characterized by X-ray diffraction analysis (XRD),
Scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and radioluminescence (RL).
Moreover, using thermoluminescence (TL) and optically stimulated luminescence (OSL) techniques, the
dosimetric properties of the phosphors were comprehensively investigated, such as emission spectra, glow
curve reproducibility, dose-response linearity, fading of the luminescent signal, OSL decay curves,
correlation between TL and OSL emissions and minimum detectable dose (MDD). For dosimetric analyses
the samples were irradiated with doses of between 169 mGy and 10 Gy. TL emission spectra confirmed the
presence of Tb3+ and Mn2+ ions in crystalline matrices. The samples showed a typical exponential OSL
decay curve with the predominance of a fast decay component, indicating that the traps have a high
photoionization cross-section for blue LEDs, and a MDD on the order of mGy. The luminescent signals
showed to be linear and reproducible in the studied dose range. The trapping centers located between 0.63
eV and 1.07 eV were revealed. The high TL sensitivity of phosphors was proven when comparing with
commercially available dosimeters. It was also observed that co-doping with Mn and Tb contributed to a
reduction in fading compared to CaSO4:Mn and CaSO4:Tb.
Como referenciar
SILVA, ANDERSON M.B.; RODRIGUES, DANIEL S.; GUEDES, BEATRIZ D.; SILVEIRA, IURY S.; ANTONIO, PATRÍCIA L.; JUNOT, DANILO O.; CALDAS, LINDA V.E.; SOUZA, DIVANIZIA N. TL and OSL characterization of CaSO4:Tb, CaSO4:Mn AND CaSO4:Mn,Tb phosphors. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47980. Acesso em: 09 May 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.