Synthesis and characterization of Mn doped magnesium oxide nanoparticles and investigation of their thermoluminescence dosimetry properties in gamma irradiation

This research successfully synthesized magnesium oxide nanoparticles doped with Mn by the co-precipitation method, followed by annealing at an optimized temperature. Structural analysis using X-ray diffraction confirmed the formation of pure and crystalline Mn-doped MgO nanoparticles. The morphology and elemental composition were analyzed using scanning electron microscopy and energy- depressive X-ray spectroscopy. The XRD spectrum of the synthesized particles shows a MgO with a crystallite size of about 20 nm. The MgO lattice was confirmed to contain Mn ions by EDX analysis. The photoluminescence properties of MgO:Mn were also investigated. The nanoparticles were subjected to ⁶⁰Co gamma irradiation to examine their thermoluminescence properties. Glow curves were obtained by heating irradiated samples, and the characteristics of the glow peaks were analyzed. The investigation focused on the impact of different parameters, including dopant concentration and annealing temperature, on the thermoluminescence properties of nanoparticles. Dopant concentration and optimized annealing temperatures led to a better thermoluminescence response. The evaluation of dose-response characteristics involved assessing linearity, sensitivity, and reproducibility. A computer program that relies on general order kinetics assisted in identifying and analyzing the TL glow peaks and their kinetic parameters. The thermoluminescence curve of nanoparticles is relatively straightforward, depending on the radiation dose, and the degree of fading is relatively minor.