Thermoluminescence and radioluminescence properties of tissue equivalent Cu-doped Li2B4O7 for radiation dosimetry

E. CRUZ-ZARAGOZA; C. FURETTA; J. MARCAZZÓ; M. SANTIAGO; C. GUARNEROS-AGUILAR; R. PALOMINO-MERINO

León, Guanajuato, México

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

Universidad de Guanajuato

Thermoluminescence (TL) and radioluminescence (RL) properties of lithium tetraborate (Li2B4O7) doped with different concentration of copper (0.25, 0.5, 1 wt %) under gamma and beta irradiation has been investigated. The feasibility of using this borate in radiation dosimetry at low doses has been evaluated. Tissue equivalent Li2B4O7 was prepared by solid state reaction using mixing stoichiometric compositions of lithium carbonate (Li2CO3) and boric acid (H3BO3) and a solution of CuCl2 as dopant. The glow curve, of the most efficientcopper doped borate (Li2B4O7:Cu 0.5 wt %), shows a main stable peak centered at 225°C and a second low temperature peak centered at 80oC. The low temperature peak disappears completely after 24 hours ofstorage in darkness and at room temperature or after an annealing at 120°C for 10 seconds. The main peak of the Li2B4O7:Cu remains constant. The TL response of Li2B4O7:Cu shows good linearity in the analyzeddose range. The stability and repeatability of RL signals of the borate have been studied and the Li2B4O7:Cu (0.5 wt %) shown the higher RL emission and a stable and repetitive response. Results show that Li2B4O7:Cu has prospects to be used in gamma and beta radiation dosimetry.