Thermal and sctructural properties of the CaB4O7-CaB2O4 system viewing the development of thermoluminescent dosimeter / Propriedades térmicas e estruturais do sistema CaB4O7-CaB2O4 visando o desenvolvimento de dosímetro termoluminescente

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Borate glasses containing modified oxides have been studied on account of their effective atomic number close to that of the human tissue, what makes them interesting materials for the development of the thermoluminescent dosimeters. The purpose of this work was to study the thermal and structure properties of the xCaB4O7-(100-x)CaB2O4 system with x ranging from 0 to 100 wt%. The undoped samples were previously studied in order to determine a composition that would present a better thermoluminescent response for the incluision of the Dy íon as dopant and Li as co-dopant, thus increasing its TL efficiency. By the melting/molding method, the glass-ceramic samples was determined by the X-ray difractometry and identified as a unique CaB2O4 phase. The glass-ceramic 20 CaB2O4 (wt%) composition presented the best TL response being doped with Dy and co-doped with Li for the study of the dosimetric properties. This study has shown a linear response within an interval of 5 to 70 minutes of exposure to the UV radiation and good reproducibility of the TL signal, thus proving to be a promising material for using in the personal and clinical dosimetry.

ASSUNTO(S)

dosimetry thermal properties termoluminescência dosimetria propriedades térmicas thermoluminescence borate boratos

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