Demonstration of an optically stimulated luminescence (OSL) material with reduced quenching for proton therapy dosimetry: MgB&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt;:Ce,Li

Yukihara, E.G.; Christensen, J.B.; Togno, Michele

doi:10.1016/j.radmeas.2022.106721

Demonstration of an optically stimulated luminescence (OSL) material with reduced quenching for proton therapy dosimetry: MgB₄O₇:Ce,Li

Citation

Yukihara, E. G., Christensen, J. B., & Togno, M. (2022). Demonstration of an optically stimulated luminescence (OSL) material with reduced quenching for proton therapy dosimetry: MgB₄O₇:Ce,Li. Radiation Measurements, 152, 106721 (8 pp.). https://doi.org/10.1016/j.radmeas.2022.106721

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:40965

The objective of this work is to demonstrate that MgB₄O₇:Ce,Li, a new optically stimulated luminescence (OSL) dosimetric material, shows improved response for proton therapy dosimetry, with less reduction in luminescence detector efficiency with the particle linear energy transfer (LET). MgB₄O₇:Ce,Li was synthesized and its luminescence efficiency as a function of LET was characterized for dose-averaged LET values from 0.73 keV/μm up to 74.9 keV/μm using proton, ⁴He, and ¹²C ion beams. Commercial Al₂O₃:C OSLDs were also used for comparison. Monte Carlo simulations were used to predict the material's response in pristine and spread-out Bragg peaks (SOBP), suggesting the MgB₄O₇:Ce,Li would offer minimum quenching in proton beams of energies relevant to radiotherapy. This prediction was confirmed by irradiations of MgB₄O₇:Ce,Li and Al₂O₃:C along SOBPs from proton beams. The results demonstrate that new OSL materials optimized for proton dosimetry can be developed using their dose response to low-LET radiation as a guide during material development.