Structural, optical and dosimetric characterization of CaSO4:Tb, CaSO4:Tb, Ag and CaSO4:Tb,Ag(NP)
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Journal of Luminescence
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The proposal of this work was to produce and characterize CaSO4 crystals doped with terbium and silver
nanoparticles for use in thermoluminescent (TL) and optically stimulated luminescent (OSL) dosimetry. The
crystalline structure, morphology and optical properties of the phosphors were characterized by X-ray diffraction
(XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and photoluminescence.
The viability of the slow evaporation route used in the production was confirmed. The silver
nanoparticles (Ag(NPs)) were prepared by the method proposed by Lee and Meisel and characterized by XRD and
visible absorption spectroscopy (UV–Vis). The composites were obtained from the addition of Teflon to the
phosphors. Through the analyses, it was observed that the presence of silver nanoparticles slightly increases the
intensity of the emission of the phosphor and shifts the dosimetric TL peak from 185 °C to 310 °C, at a heating
rate of 10 °C/s. The samples presented a typical exponential OSL decay curve with a very slow component (τ3 ≥
152 s) that indicates that the traps have a low photoionization cross-section for blue LEDs. CaSO4:Tb,Ag(NP)
presented a higher sensitivity to radiation than CaSO4:Tb,Ag. The lowest detectable dose (LDD) and the fading of
the TL signal of the composites were also evaluated. All samples presented a luminescent signal reproducible and
linear, with TL and OSL responses proportional to the absorbed doses in the range of 169 mGy to 10 Gy.
Como referenciar
SILVA, ANDERSON M.B.; JUNOT, DANILO O.; CALDAS, LINDA V.E.; SOUZA, DIVANIZIA N. Structural, optical and dosimetric characterization of CaSO4:Tb, CaSO4:Tb, Ag and CaSO4:Tb,Ag(NP). Journal of Luminescence, v. 224, p. 1-12, 2020. DOI: 10.1016/j.jlumin.2020.117286. Disponível em: http://repositorio.ipen.br/handle/123456789/31402. Acesso em: 30 Dec 2025.
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