Stimulated luminescence property of Zn(BO2)2:TbCl3

G. CEDILLO; E.CRUZ-ZARAGOZA; M. GARCÍA; J. MARCAZZÓ; J.M. HERNANDEZ; H. MURRIETA

León

Congreso; XV International Symposium on Solid State Dosimetry (ISSSD); 2015

Universidad de Guanajuato

Zinc metaborate, Zn(BO2)2, doped with TbCl3 at different concentration (0.5-8 mol%) was analyzed. The polycrystalline samples were characterized by Scanning Electron Microscopy (SEM/EDS) and X-ray Diffraction (DRX) analysis. The thermoluminescent (TL) intensity was dependent on the thermal treatment (250-500 °C) and also on the impurity concentration. The glow curves show four glow peaks at about 82, 164, 251, and 331 °C. The shapes of these peaks were obtained by fading and CGCD deconvolution method too. The kinetics parameters (activation energy, frequency and the kinetic order) were calculated using the general order kinetics model describing accurately the TL process. The glow peaks seem overlapped and then the whole glow curve was considered for dosimetric characteristics measurements. The TL intensity as a function of gamma dose was performed. This phosphor at 8 mol% of impurity concentration exhibited an intense radioluminescent (RL) emission respect to the Al2O3:C dosimeter. The RL spectra show their maximum bands at 370, 490, 545 and 700 nm. The linear dose-response was between 2.2 cGy and 27.7 Gy when the samples were exposed to beta radiation. These results suggest that the Tb -doped zinc metaborate material is a good phosphor for use in radiation dosimetry because its high TL sensitivity to the ionizing radiation and low fading.