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

Autor(es)

Oliveira, Luiz C. ^[1] ; Yukihara, Eduardo G. ^[2] ; Baffa, Oswaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, FFCLRP, Dept Fis, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 - USA

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 6, APR 14 2016.
• Citações Web of Science: 14

Resumo

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 similar to 180 degrees C (at a heating rate of 5 degrees C/s) associated with Ce3+ and Sm3+ 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 Al2O3:C, under the measurement conditions) and wide dynamic range (7 mu Gy-30 Gy). The OSL associated with Ce3+ emission is correlated with a dominant, practically isolated peak at 180 degrees C. Fading of similar to 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 Ce3+, make this material also a strong candidate for 2D OSL dose mapping. (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