Akademik Veri Yönetim Sistemi
Radiation Physics and Chemistry, cilt.233, 2025 (SCI-Expanded)
The objective of this work is to present the potential of calcium hexaaluminate CaAl12O19 (CAO) ceramic material doped with Tm and Be to fill in the gaps where the need for a new material for optically stimulated luminescence (OSL) dosimetry has been identified. The synthesis of powders of a calcium aluminate CaAl12O19, was investigated using sol-gel technique. The structure and morphology of the CAO:Tm,Be ceramics were characterized via X-ray diffraction (XRD) and scanning electron microscope/energy-dispersive (SEM/EDS) techniques. Photoluminescence (PL), Radioluminescence (RL) and Thermoluminescence (TL) methods comprehensively investigated the associated luminescence emissions. We assessed the functional properties of CAO:Tm,Be for OSL dosimetry by measurements of TL/OSL spectroscopy, sensitivity, lifetimes of the OSL decay curve components, dose response up to 50 Gy, fading and reusability. The PL emission spectra of CAO:Tm,Be phosphor exhibited main emission peak centered at 650 nm because of the 1G4 → 3F4 transition of Tm3+. CAO:Tm,Be shows a slow decaying luminescent signal following exposure to ionizing radiation with the lifetimes of 5.1 s for the fast component and 2.5 × 109 s for the slow component. It can be proposed that two TL peaks observed up to 200 °C were responsible for the determined decay components of the OSL signal. TT-OSL signals corresponding to approximately 20 % of the OSL signal were confirmed the discharge of the deep traps around 300 °C. The luminescence characteristics of this compound suggest that consideration to be given this material for use as dosimeters is valuable and needs further optimization to gain a better understanding of the roles of the synthesis route and dopants and of the nature of defects.