Akademik Veri Yönetim Sistemi
Ceramics International, cilt.52, sa.11, ss.17862-17872, 2026 (SCI-Expanded, Scopus)
Lanthanum borate (LaBO3) phosphors doped with various concentrations of Nd3+ ions were synthesized using the solution combustion technique. Structural and thermoluminescent characteristics were systematically investigated. X-ray diffraction patterns confirmed the presence of a single-phase orthorhombic crystal structure. Surface morphology and elemental distribution, analyzed via scanning electron microscopy and energy-dispersive X-ray spectroscopy, indicated spherical particle shapes and homogeneous Nd3+ dispersion. Among the studied compositions, the sample with 2 wt% Nd3+ doping demonstrated the highest TL efficiency, characterized by two distinct glow peaks near 75 and 257 °C when evaluated using a 565 nm optical filter. Dose-response analysis showed excellent linearity in the 0.5–200 Gy range, with supralinearity observed at higher doses. The sample exhibited strong repeatability with <5% variation over ten readout cycles. A minimum detectable dose (MDD) of 0.24 ± 0.02 Gy was determined, while the effective atomic number (Zeff) was estimated to be 44.27, indicating considerable responsiveness of the phosphor to ionizing radiation exposure. Kinetic parameters derived using the variable heating rate method yielded corrected activation energies of 0.65 eV and 1.83 eV, with frequency factors of 4.99 × 1011 s-1 and 3.63 × 1020 s-1, respectively. Thermal quenching parameters (C and W) confirmed increasing non-radiative recombination at elevated temperatures. The Tm–Tstop method demonstrated that the main dosimetric peak was thermally independent, while the lower-temperature peak exhibited retrapping behavior. At least eight distinct trap levels were identified between 0.3 and 1.5 eV. Computerized Glow Curve Deconvolution revealed eight well-resolved peaks with activation energies ranging from 0.48 eV to 1.79 eV, with a low figure of merit (FOM = 1.21%) indicating high fitting accuracy. Fading tests showed a 20% loss in signal intensity after 14 days. Overall, 2 wt% Nd3+ doped LaBO3 demonstrates excellent sensitivity, thermal stability, and multi-trap behavior, making it a promising candidate for both low and high-dose TL dosimetric applications.