Thermoluminescence, electron paramagnetic resonance, and structural characterization of natural prehnite for high-dose radiation dosimetry
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Journal of Physics and Chemistry of Solids
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Natural prehnite was evaluated as a thermoluminescence (TL) material for high-dose dosimetry. XRF identified SiO₂, Al₂O₃, and CaO as major constituents. Prehnite samples annealed between 200 and 800 °C (1 h) were examined by XRD and Rietveld analysis, confirming prehnite as the majority phase and revealing calcite and vaterite after heating. The 600 °C sample provided the highest TL yield and was selected for detailed study. Fading tests showed a ~40% loss in the 240 and 350 °C peaks over 5.42 days (130 h), followed by signal stability. Dose–response demonstrated, for the 245 °C peak and 325 °C peak, linear regions in the ranges of 0.1–2 kGy and 0.5–20 kGy, respectively, with saturation occurring between 30 and 100 kGy. Kinetic parameters were obtained using TM-Tstop, initial-rise, and variable-heating-rate methods; glow-curve deconvolution resolved five TL components. TL spectra displayed an intense band near 530 nm and a weak band at 550 nm, suggesting two main recombination centers.
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GOMES, MONISE B.; GONZALES-LORENZO, CARLOS D.; ROCCA, RENE R.; RAMIREZ, F. N.; CUEVAS-ARIZACA, EDY E.; SILVA-CARRERA, BETZABEL N.; GUNDU RAO, T. K.; CANO, NILO F.; CHUBACI, JOSE F. D. Thermoluminescence, electron paramagnetic resonance, and structural characterization of natural prehnite for high-dose radiation dosimetry. Journal of Physics and Chemistry of Solids, v. 212, p. 1-10, 2026. DOI: 10.1016/j.jpcs.2026.113519. Disponível em: https://repositorio.ipen.br/handle/123456789/50014. Acesso em: 19 Jun 2026.
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