Caracterização dosimétrica por termoluminescência em vidros BPCL

Abstract

The glass samples containing boron as the main former to the glassy lattice, denominated as borate glasses, have been studied by its several characteristics that promotes to them many applications. The addition of modifier compounds to the borate structure may change its glassy structure and also causing changes in its physicochemical properties. The compositions may be designed according to the desired properties. The present work was developed in order to study the physical and chemical properties of borate glasses with lead chloride addition. Two glass systems were considered, being System I: 50B2O3 – (50 - x) PbO – xPbCl2 in mol % and System II: 50BO1,5 – (50 - x) PbO – xPbCl2 in cationic %. At this work, we used the nomenclature BPCL1 for the system 1, and BPCL2 for system 2. The main goal was to identify a glass matrix with good characteristics considering the thermoluminescense (TL) phenomenon. Thermoluminescent analisys shows an interesting TL response from BPCL1-02 glassy sample (system I) that has been highly sensitive to UV radiation. Two peaks in the TL curve shows linear response under ultraviolet (UV) irradiation. The first and higher intense peak (~ 122 °C) presented a linear response up to ~ 2 J/cm2 . The second peak, observed at higher temperature (~ 188 °C) showed a linear response up to ~ 4 J/cm2 . In general the BPCL1-02 has been evaluated as a potential material to be applied as an UV radiation dosimeter.