Publication date: 21st July 2025
This research investigates the thermoluminescence (TL) behavior and kinetic characteristics of europium (Eu³⁺)-doped gadolinium aluminum borate (GdAl₃(BO₃)₄, or GAB) phosphors synthesized using the sol-gel technique. The influence of Eu³⁺ incorporation on the crystalline structure of undoped GAB was studied through X-ray diffraction (XRD), confirming that the doped samples preserved the rhombohedral phase aligned with the PDF#72–1985 reference pattern. TL glow curve analysis of Eu³⁺-doped GAB revealed three distinct emission peaks occurring near 86 °C, 185 °C, and 300 °C. The phosphor containing 1 wt% Eu³⁺ demonstrated the highest TL intensity. The optimal thermal treatment for erasing the TL signal corresponding to the 86 °C peak was established as heating to 135 °C for 16 seconds. Over a storage period of three months, the TL signal showed a 14.71% decline. The minimum detectable dose (MDD) was found to be 1.290 ± 0.02 mGy, highlighting its effectiveness for detecting low radiation levels. A linear dose-response relationship was maintained over a broad exposure range (2–300 Gy), with consistent sensitivity. Analysis via the Ea–Tstop method identified six glow peaks, with associated activation energies spanning from 0.99 eV to 1.18 eV, reinforcing the material's potential for use in radiation dosimetry.
The Deputyship for Research& Innovation, Ministry of Education in Saudi Arabia for fund ing this research work
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