Beta-radiation-induced thermoluminescence and kinetic properties of Dy3+-doped LaBO3 phosphor
Applied Radiation and Isotopes, cilt.238, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 238
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.apradiso.2026.112894
- Dergi Adı: Applied Radiation and Isotopes
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, EMBASE, INSPEC, MEDLINE, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Deconvolution, Dy3+, LaBO3, TL dosimetry, TQ, VHR analysis
- Çukurova Üniversitesi Adresli: Evet
Özet
In this study, a solution combustion approach was utilized to successfully produce Dy3+-doped LaBO3 phosphors. A comprehensive evaluation of their dosimetric capabilities, thermoluminescence (TL) features, and crystallographic properties was subsequently performed. The presence of a pure orthorhombic crystalline phase, free from any secondary formations, was verified through X-ray diffraction measurements. Elemental and morphological analyses utilizing EDX and SEM showcased the effective doping of Dy3+ into the lattice framework alongside a distinctly porous surface structure. We examined the impact of varying the Dy3+ dopant amounts from 0.25 to 7 wt%, discovering that the 1 wt% concentration yielded the maximum luminescent signal when monitored with a 565 nm filter. The glow curve of the optimum composition consisted of four prominent glow peaks, indicating the presence of trapping centers with different thermal stabilities. The beta dose response exhibited an almost ideal linear behavior between 0.1 and 30 Gy (b = 0.98, R2 = 0.99992), while a sublinear trend appeared at higher doses due to trap saturation effects. The phosphor demonstrated excellent reusability with a coefficient of variation close to 1% over ten irradiation–readout cycles. A minimum detectable dose of 0.09 ± 0.01 Gy and an effective atomic number of 50.31 were calculated, highlighting the high sensitivity of the material to ionizing radiation. Kinetic parameters determined with a method using the various heating rates presented corrected activation energies of 1.19, 1.60, 1.73, and 1.94 eV for the visible maxima. Thermal quenching analysis produced activation energies of 1.24 and 1.66 eV for the high-temperature peaks. Tm–Tstop, Initial Rise, and computerized glow curve deconvolution analyses consistently revealed a complex trapping structure composed of approximately eight discrete trap levels. The deconvolution fits resulted in low figure of merit (FOM) values of 2.24% and 0.82%, confirming the reliability of the deconvolution procedure and the extracted kinetic parameters. These findings demonstrate that LaBO3:Dy3+ is a promising thermoluminescent material for radiation dosimetry applications requiring high sensitivity and stable signal characteristics.