Low energy X-ray dosimeter based on LYSO:Ce fluorescent powder

• Published in: Applied optics (2004) 2023-04, Vol.62 (11), p.2734
• Main Authors: Zheng, Luchuan, Xu, Chao, Wang, Taiqi, Cheng, Yongkang, Christy, Yollanda Bella, Li, Haoyu, Cheng, Jiayao, Peng, Gangding, Guo, Qiang
• Format: Article
• Language: English
• Subjects: Cerium; Doping; Dosimeters; Luminescence; Lutetium; Photoluminescence; Radiation measurement; Radiation therapy; X ray irradiation; X ray tubes; X-ray diffraction; Yttrium
• ISSN: 1559-128X; 2155-3165
• DOI: 10.1364/AO.486050

Cerium-doped lutetium yttrium orthosilicate (LYSO:Ce) powder has been synthesized by the co-precipitation method. The influence of the Ce3+ doping concentration on the lattice structure and luminescence characteristics of LYSO:Ce powder was investigated by X-ray diffraction (XRD) and photoluminescence (PL). The XRD measurement indicates that the lattice structure of LYSO:Ce powder was not changed by doping ions. PL results show that LYSO:Ce powder has better luminescence performance when the Ce doping concentration is 0.3 mol%. In addition, the fluorescence lifetime of the samples was measured, and the results show that LYSO:Ce has a short decay time. The radiation dosimeter was prepared by LYSO:Ce powder with a Ce doping concentration of 0.3 mol%. Radioluminescence properties of the radiation dosimeter also were studied under X-ray irradiation at doses from 0.03 to 0.76 Gy, with dose rate from 0.09 to 2.284 Gy/min. The results show that the dosimeter has a certain linear relationship response and stability. The radiation responses of the dosimeter at different energies were obtained under X-ray irradiation with X-ray tube voltages ranging from 20 to 80 kV. The results show that the dosimeter has a certain linear relationship response in the low energy range of radiotherapy. These results indicate the potential application of LYSO:Ce powder dosimeters in remote radiotherapy and online radiation monitoring.