Akademik Veri Yönetim Sistemi
Ceramics International, 2025 (SCI-Expanded)
This study investigates the thermoluminescence (TL) characteristics of Eu3+-doped K7SrY2(B5O10)3 (KSYBO) phosphors synthesized via high-temperature solid-state reaction. The TL behavior was evaluated under β-irradiation across a wide dose range (0.1–300 Gy) using variable heating rate (VHR) and computerized glow curve deconvolution (CGCD) techniques. An anomalous heating rate behavior (AHRB) was observed, wherein TL intensity increased with heating rate—deviating from classical TL theory. This effect is interpreted through the semi-localized transition (SLT) model, suggesting thermally assisted recombination via shallow-to-deep trap interactions. CGCD resolved nine discrete TL peaks with activation energies ranging from 0.43 to 2.58 eV, reflecting a wide range of trap depths and complex recombination dynamics. The trap parameters obtained from CGCD confirm the presence of both shallow, thermally unstable traps and deep, stable centers relevant for long-term signal retention. The material exhibited excellent repeatability (±2.24 %) and a quasi-linear TL dose response (R2 = 0.996), supporting its potential use in high-dose dosimetry. Fading analysis revealed that shallow traps (∼76 °C) undergo substantial signal loss (∼75 %) within seven days, while deep traps (∼300 °C) retained over 79 % of their intensity. This dual-trap behavior underscores the simultaneous presence of high initial sensitivity and long-term signal stability. These findings demonstrate that KSYBO:Eu3+ phosphors combine structural robustness, anomalous TL kinetics, and favorable fading resistance, making them promising materials for thermoluminescent dosimetry applications.