Thermoluminescence in MgB4O7:Pr,Dy dosimetry powder synthesized by solution combustion synthesis method


Ozdemir A., Guckan V., Altunal V. , Kurt K., Yegingil Z.

JOURNAL OF LUMINESCENCE, cilt.230, 2021 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

This study aimed to investigate the dosimetric properties of magnesium tetraborate (MgB4O7) doped with praseodymium (Pr3+) and dysprosium (Dy3+) using the thermoluminescence (TL) technique. In this study, the dopant concentrations of Pr0.01-2% wt and Dy0.01-20% wt were induced into MgB4O7 with Solution Combustion Synthesis (SCS) method. Their effect was enhanced sensitivity of TL when used with the optimal dopant concentrations Pr-0.5% wt and Dy-5% wt incorporated in the lattice. The structural characterizations of MgB4O7:Pr-0.5% wt,Dy-5% wt phosphor was studied using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) analysis techniques. X-ray Luminescence (XL) spectra of several of these phosphors with various dopants as used here, were also determined. The TL glow curve of the MgB4O7:Pr-0.5% wt, Dy-5% wt phosphor consists of four TL peaks at similar to 85, similar to 180, similar to 265, similar to 320 degrees C when recorded with a heating rate of 2 degrees C/s without preheating. Some dosimetric properties of the MgB4O7:Pr,Dy phosphor, such as dose-response, reusability and fading in dark were studied under Sr-90/Y-90 beta-ray radiation. The TL output was found as linear with dose from 0.1 to 100 Gy. The good reusability, by 2% standard deviation, was up to 20 experimental cycles. After 24 h, the maximum heights of TL glow peaks at 180 and 320 degrees C were about 7 and 4% less than that of the readouts at half an hour later the irradiation. The kinetic parameters using various heating rate (VHR), T-m-T-stop assisted extended initial rise method (IRM) and computerized glow curve deconvolution (CGCD) techniques were obtained and compared. Experimental results suggest that Pr3+ and Dy3+ doped MgB4O7:Pr-0.5% wt,Dy-5% wt shows suitable dosimetric properties for TL dosimetry.