Analysis of dosimetric characteristics of CaSO4:Mn,Tb phosphors synthesized by four different routes
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Applied Radiation and Isotopes
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The luminescence properties of crystalline materials are critical for monitoring physical phenomena, including
ionizing radiation doses. In this study, CaSO4:Mn,Tb phosphors were synthesized using four distinct methods:
solid-state diffusion, co-precipitation, sol-gel, and slow evaporation routes. The influence of synthesis conditions
on the structural, morphological, elemental, and luminescent properties of the phosphors was systematically
investigated. X-ray diffraction (XRD) patterns confirmed that all synthesis routes produced samples with a stable
CaSO4 crystal phase, and doping with Tb3+ and Mn2+ did not alter the crystal structure. Scanning electron
microscopy (SEM) images revealed that synthesis methods significantly influenced grain morphology. Energydispersive
X-ray spectroscopy (EDS) spectra validated the successful incorporation of Tb3+ and Mn2+ ions into
the crystal lattice. The slow evaporation route, followed by co-precipitation, yielded the highest intensity of
thermoluminescence (TL) glow curves, which were characterized using Schott BG-39 and Hoya U-340 bandpass
filters to control wavelengths. Different emission curve behaviors for TL were observed. In the optically stimulated
luminescence (OSL) analyses, obtained with continuous intensity optical stimulation and a 40 s integration
time, all samples exhibited an exponential decrease in OSL signal as the charge traps were emptied. The
CaSO4:Mn,Tb phosphor produced via the sol-gel route, and that synthesized by slow evaporation, showed the
highest OSL intensity, followed by those produced via co-precipitation and solid-state synthesis. However, the
high coefficient of variation (CV) in TL/OSL responses of samples produced by sol-gel and co-precipitation
methods limited the reproducibility of the luminescent measurements. The slow evaporation route emerged as
the most consistent and efficient method, exhibiting low CV values (<10 %) in terms of signal variation and
sensitivity, the highest linear correlation in the dose-response relationship over the irradiation range of 0.16
Gy–100 Gy, and greater TL signal stability for long-term applications.
Como referenciar
SILVA, ANDERSON M.B.; JUNOT, DANILO O.; ANTONIO, PATRICIA L.; SOUZA, DIVANIZIA N.; CALDAS, LINDA V.E. Analysis of dosimetric characteristics of CaSO4:Mn,Tb phosphors synthesized by four different routes. Applied Radiation and Isotopes, v. 229, p. 1-8, 2026. DOI: 10.1016/j.apradiso.2025.112381. Disponível em: https://repositorio.ipen.br/handle/123456789/49318. Acesso em: 20 Mar 2026.
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.