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Development and characterization of new borate-based compounds for X-rays, gamma rays and neutron luminescence dosimetry

França, Leonardo Vinícius Da Silva

Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto 2022-11-16

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  • Título:
    Development and characterization of new borate-based compounds for X-rays, gamma rays and neutron luminescence dosimetry
  • Autor: França, Leonardo Vinícius Da Silva
  • Orientador: Baffa Filho, Oswaldo
  • Assuntos: Luminescência Opticamente Estimulada; Boratos; Dosimetria Das Radiações; Lantanídeos; Prata; Radiation Dosimetry; Optically Stimulated Luminescence; Borates; Lanthanides; Silver
  • Notas: Tese (Doutorado)
  • Descrição: Radiation dosimetry is required in several contexts, such as X-ray imaging, nuclear medicine, radiotherapy, radiation-exposed research facilities, synchrotrons and space, to name a few. In view of this, a technique based on the optically stimulated luminescence (OSL) phenomenon, which is the light emission of a previous irradiated material when optically stimulated, has emerged. After more than 20 years of research, there are only two commercially available OSL dosimeters, which are based on Al2O3 :C and BeO compounds. The main objective of this work is to propose new OSL phosphors based on a calcium borate compound, i.e., CaB6O10 (Zeff=11.5) doped with lanthanides (Gd3+, Tb3+ or Ce3+) and silver (Ag+ ). Tb,Ag-doped compound, for instance, exhibited OSL sensitivity comparable to that of Al2O3 :C (using U340 Hoya filters), wide linear dose-range with no signs of saturation (30 mGy up to 20 Gy), fading of ~30% after 24 h following stability, neutron sensitivity, and showed to be reproducible and repeatable. Gd,Ag-doped compound exhibited similar dosimetric features. OSL from different compounds exhibited luminescence lifetimes ranging from microsecond to nanosecond time-scale, depending on the dopant used. This addresses both 2D laser scanning dosimetry and pulsed OSL dosimetry requirements using the same host compound.
  • DOI: 10.11606/T.59.2022.tde-04102023-065627
  • Editor: Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto
  • Data de criação/publicação: 2022-11-16
  • Formato: Adobe PDF
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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