DEVELOPMENT OF Dy3+-DOPED BORO-TELLURITE THERMOLUMINESCENCE GLASSES FOR ENHANCED RADIATION DOSIMETRY APPLICATIONS
Dy3 +-Doped Boro-Tellurite TL Glasses for Dosimetry
DOI:
https://doi.org/10.55766/sujst9347Keywords:
Boro-tellurite, Dosimeter, ThermoluminescenceAbstract
This study presents the development of boro-tellurite glasses doped with varying concentrations of Dy₂O₃ (0.0, 0.1, 0.5, 1.0, and 1.5 mol%) using a conventional melt-quenching technique, targeting advanced thermoluminescence materials for radiation detection. Structural characterization via X-ray diffraction confirmed the amorphous nature of all samples, while comprehensive optical investigations-including UV-Vis-NIR absorption and photoluminescence spectroscopy-revealed distinct intra-4f electronic transitions of Dy³⁺ ions. The incorporation of Dy₂O₃ not only altered the optical absorption and emission characteristics (exhibiting prominent blue and yellow bands) but also significantly modified the glass network, influencing density, molar volume, and the formation of defect-related electron traps. Thermoluminescence measurements, performed under controlled irradiation with an Am-241 source at a dose of 1 mGy and a heating rate of 5°C/s, exhibited a well-defined glow peak whose intensity and activation energy were strongly dependent on the Dy concentration. An optimal performance was observed at 1.0 mol% Dy₂O₃, where the activation energy peaked at 1.17 eV, indicative of deep and stable traps favorable for dosimeter applications. These results demonstrate that precise control of Dy₂O₃ doping in boro-tellurite glasses can significantly enhance their performance, making them promising candidates for reliable radiation dosimetry in medical.
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