PATRICIA DE LARA ANTONIO
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Resumo IPEN-doc 30320 TL and OSL characterization of CaSO4:Tb, CaSO4:Mn AND CaSO4:Mn,Tb phosphors2023 - 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.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.Resumo IPEN-doc 30130 Thermoluminescence and phototransferred thermoluminescence of radiation dosimeters:2023 - ANTONIO, PATRICIA L.; SILVEIRA, IURY S.; CALDAS, LINDA V.E.Resumo IPEN-doc 30125 OSL and PTOSL of dosimetric materials: observation of the luminescence after exposure to 90Sr+90Y source and LEDs in ultraviolet range2023 - ANTONIO, PATRICIA L.; SILVEIRA, IURY S.; CALDAS, LINDA V.E.