SYNTHESIS AND CHARACTERIZATION OF GLASS MATRICES OF SODIUM BORATE AND ALUMINOSILICATE DOPED WITH SILVER AND EUROPIO FOR APPLICATIONS IN LUMINESCENT DOSIMETRY

• Grant number: 25/11189-4
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: January 01, 2026
• End date: August 31, 2028
• Field of knowledge: Interdisciplinary Subjects
• Principal Investigator: Sonia Hatsue Tatumi
• Grantee: Caroline Paschoal Fernandes
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 22/15495-4 - OSL dating and analytical techniques applied to the middle Negro River basin, Amazonia: implications on fluvial dynamics, sedimentation, landscape modifications and ichtyofauna, AP.TEM

Abstract

This study proposes the synthesis and characterization of glassy matrices of sodium borate (Na¿O-2B¿O¿) and sodium aluminosilicate (2Na¿O-3Al¿O¿-15SiO¿). These materials will be doped with silver (Ag) and europium (Eu) in variable molar concentrations (0.001 to 1%). The objective is to evaluate their luminescent properties for application in ionizing radiation dosimetry. The research aims at the development of new dosimetric materials with optimized responses for thermoluminescence (TL), optically stimulated luminescence (OSL) and radiophotoluminescence (RPL), considering the effective atomic number (Zeff) of 7.5 (human tissue) and 11.2 (quartz). Materials with Zeff close to human tissue will be used for personal dosimetry, while those with Zeff similar to that of sediments will be used for environmental dosimetry, improving the accuracy of dose estimation in different contexts. Especially in regions such as Barcelos (AM), where the research is linked to project no. 2022/15495-4, contributing to advances in geological, archaeological and biological studies in the Mariuá Archipelago. The work involves the synthesis of matrices, thermal characterization, analysis of the effects of heat treatments and dopants on luminescent responses and testing of dosimetric requirements, including repeatability, dose curve, minimum detectable dose and fading. (AU)