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

Author(s)

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

Affiliation

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

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

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 6, APR 14 2016.
• Web of Science Citations: 14

Abstract

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)

• FAPESP's process: 12/18687-0 - Development of optically stimulated luminescent material for two-dimension dosimetry
• Grantee: Luiz Carlos de Oliveira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral