Luminescência opticamente e termicamente estimulada de biovidros

Abstract

The development and improvement of materials for dosimeter is of fundamental importance for use in adequate safety and radiological protection procedures. Therefore, in this work we investigate the optical and dosimetric properties of pure SNCP bio-glass, doped with europium ions and co-doped with silver. The characterization techniques used were Optical Absorption (AO), Fluorescence (FL), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL). In the AO spectra, absorption bands characteristic of bioglass and dopants (europium: Eu3+ and silver: Ag) were observed, indicating that doping with Ag generated nanoparticles of Ag due to the presence of the plasmonic band. Based on the AO spectra, it was found that the nanoparticles are spherical and sizes around 40 nm. In the FL spectra, observed emission bands for both Ag nanoparticles and Eu3+ ions, demonstrating that when using 360 nm excitation the co-doped sample emits in green and red, with 470 nm emitting only in red. Thermoluminescent characteristics such as linearity, reproducibility and TL emission curve were evaluated. In addition, reproducibility and OSL emission curve were also analyzed. In the TL results, pure bioglass showed an emission curve with four peaks centered at 130 ° C, 210 ° C, 335 ° C and a peak with greater intensity around 250 ° C, the bioglass doped with Eu3+ showed an emission peak in around 125 ° C, the bio-glass co-doped with Ag around 125°C, 186°C, 295°C. Bioglasses doped with Eu3+ and co-doped with Ag demonstrated great potential for applicability in OSL dosimetry. Therefore, based on these results, we have demonstrated that pure bio-glass, doped with Eu3+ and co-doped with Ag are promising materials for applications in the dosimetry of ionizing radiation and also in biomedicine.