Thermoluminescence properties of lithium barium borate glass doped with Vanadium, Samarium and Dysprosium for dosimetry

Abstract

This study investigates the thermoluminescence (TL) properties of lithium barium borate (LBB) glasses doped with Vanadium (V), Samarium (Sm), and Dysprosium (Dy) to evaluate their dosimetric potential under 6 MV photon irradiation at doses ranging from 2 to 10 Gy. The analysis focuses on glow curves, dose-response linearity, and sensitivity in both undoped and doped samples. Dopant concentrations ranging from 0.2 to 1.0 mol% were investigated to determine their impact on TL properties. While undoped LBB exhibits high sensitivity at elevated doses (350 nC/mg at 10 Gy), its variability in linearity (R² = 0.8627) and sensitivity limits its practical use. Doping at optimized concentrations enhances these properties, refining the glass matrix for improved dosimetric performance. V-doped LBB at 1.0 mol% demonstrates exceptional sensitivity and strong TL responses (87 nC/mg at 10 Gy, R² = 0.9257), particularly in high-dose applications. Sm-doped LBB at 0.4 mol% provides a well-balanced profile, with improved linearity (R² = 0.9357) and consistent high TL intensity across all tested doses (119 nC/mg at 10 Gy). Dy-doped LBB at 1.0 mol% exhibits stable and reliable TL performance (105 nC/mg at 10 Gy, R² = 0.9482) across both low and high doses, ensuring precise and reproducible dosimetry. The results indicate that doping enhances the linear correlation between dose and TL response, refining the dosimetric capabilities of LBB glasses by improving sensitivity, stability, and dose-response consistency. These findings establish doped LBB glasses as promising candidates for accurate and versatile radiation dosimetry applications.