| Texto completo | |
| Autor(es): |
Oliveira, Luiz C.
;
Baffa, Oswaldo
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Luminescence; v. 181, p. 171-178, JAN 2017. |
| Citações Web of Science: | 5 |
| Resumo | |
This work describes the synthesis of a new photostimulable phosphors based on Pb-doped CaB6O10, and presents an investigation on its luminescence and dosimetric properties. The crystalline phase was confirmed by X-ray diffraction. We performed radioluminescence (RL), thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements to determine the material's luminescence sensitivity as a function of Pb concentration, dose response to ionizing radiation, as well as the luminescence emission spectra, thermal stability of the luminescence signal, and lifetime of the associated luminescence centers. The results shows that the material is highly sensitive to ionizing radiation, comparable or surpassing commercially available luminescence materials such LiF:Mg,Ti and Al2O3:C, with a dominant TL peak at similar to 200 degrees C and an OSL signal that can be similar to 99% read within similar to 20 s under current experimental conditions. The RL, TL and OSL signals are dominated by an emission band at similar to 320 nm, probably associated with P-3(1) -> S-1(0) transition of Pb2+ Although the optimum Pb concentration was 3 mol% (nominal concentration used for synthesis), high sensitivity was observed for Pb concentrations > 0.1 mol%. The luminescence decays with a 0.55 mu s and a 5.1 mu s lifetime and the dose response was linear in the range investigated (similar to 2 mGy-1 Gy). A signal fading of up to 50% within 8 days was observed, the majority of this fading taking place in the first 5 h (40%) following irradiation. This study shall motivate further fundamental investigations on this material, which may lead to an alternative OSL material for dosimetry. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 12/18687-0 - Desenvolvimento de material luminescente opticamente estimulável para dosimetria bidimensional |
| Beneficiário: | Luiz Carlos de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |