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MgO:Li,Ce,Sm as a high-sensitivity material for Optically Stimulated Luminescence dosimetry

The goal of this work was to investigate the relevant dosimetric and luminescent properties of MgO:Li(3%),Ce(0.03%),Sm(0.03%), a newly-developed, high sensitivity Optically Stimulated Luminescence (OSL) material of low effective atomic number (Z(eff) = 10.8) and potential interest for medical and pe...

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Detalles Bibliográficos
Autores principales: Oliveira, Luiz C., Yukihara, Eduardo G., Baffa, Oswaldo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4830961/
https://www.ncbi.nlm.nih.gov/pubmed/27076349
http://dx.doi.org/10.1038/srep24348
Descripción
Sumario:The goal of this work was to investigate the relevant dosimetric and luminescent properties of MgO:Li(3%),Ce(0.03%),Sm(0.03%), a newly-developed, high sensitivity Optically Stimulated Luminescence (OSL) material of low effective atomic number (Z(eff) = 10.8) and potential interest for medical and personal dosimetry. We characterized the thermoluminescence (TL), OSL, radioluminescence (RL), and OSL emission spectrum of this new material and carried out a preliminary investigation on the OSL signal stability. MgO:Li,Ce,Sm has a main TL peak at ~180 °C (at a heating rate of 5 °C/s) associated with Ce(3+) and Sm(3+) emission. The results indicate that the infrared (870 nm) stimulated OSL from MgO:Li,Ce,Sm has suitable properties for dosimetry, including high sensitivity to ionizing radiation (20 times that of Al(2)O(3):C, under the measurement conditions) and wide dynamic range (7 μGy–30 Gy). The OSL associated with Ce(3+) emission is correlated with a dominant, practically isolated peak at 180 °C. Fading of ~15% was observed in the first hour, probably due to shallow traps, followed by subsequent fading of 6–7% over the next 35 days. These properties, together with the characteristically fast luminescence from Ce(3+), make this material also a strong candidate for 2D OSL dose mapping.