Correlation studies of thermoluminescence and electron paramagnetic resonance in Cr3+-doped CaSiO3 phosphor for dosimetric purposes

This study explores Cr 3+ -doped CaSiO 3 synthesized by the devitrification method, confirmed as a β-CaSiO 3 polycrystalline structure via X-ray diffraction. Thermoluminescence (TL) analysis shows peaks at 120, 247, and 299 °C. The 120 °C peak exhibits a linear dose-response, while the 247 °C and 299 °C peaks display supralinear behavior at higher doses. The phosphor was studied using Electron Paramagnetic Resonance (EPR), revealing a single isotropic EPR line at g = 1.981 attributed to Cr 3+ ions, and another isotropic line at g = 1.978 in γ-irradiated samples identified as the F + center. The F center, precursor to the F + center, correlates with the low-temperature TL peak at 120 °C. The EPR signal at g = 1.978 shows an exponential increase with gamma dose, indicating that Cr 3+ -doped CaSiO 3 is a promising material for radiation detection and EPR dosimetry.