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

Cuevas-Arizaca E.E.; Gonzales-Lorenzo C.D.; Rojas Rocca R.R.; Gundu Rao T.K.; Diniz Chubaci J.F.; Watanabe S. · Journal of Science: Advanced Materials and Devices (2025) · DOI: 10.1016/j.jsamd.2025.101008

Resumen

This study explores Cr3+-doped CaSiO3 synthesized by the devitrification method, confirmed as a β-CaSiO3 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 Cr3+ 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 Cr3+-doped CaSiO3 is a promising material for radiation detection and EPR dosimetry.

Instituciones: Universidad Católica de Santa María