Development and evaluation of relative QA dosimeter for electron beam based on CsPbBr₃

Abstract

Quality assurance (QA) of electron beams must be performed regularly to ensure accurate radiation therapy. Therefore, a QA dosimeter for electron beams is required for accurate electron beam QA measurement. In this study, the electron beam detection performance of CsPbBr3 material was measured. And it was evaluated whether it could be applied as a QA dosimeter for electron beams. To evaluate feasibility, reproducibility, linearity, and PDD were measured, and evaluated at 6 MeV, 9 MeV, and 12 MeV energies of the linear accelerator. The reproducibility evaluation results showed relative standard deviations of 1.06% at 6 MeV, 1.39% at 9 MeV, and 1.49% at 12 MeV. Linearity result evaluation, the coefficient of determination R2 was presented as 0.9996, 0.9994, and 0.9992 at energies of 6, 9, and 12 MeV, respectively. When PDD was measured using the manufactured dosimeter, Dmax points for each energy band of 6, 9, and 12 MeV were shown. The CsPbBr3 relative dosimeter produced in this study shows detection performance that satisfies the evaluation criteria of reproducibility, linearity, and PDD. These results mean that the CsPbBr3 dosimeter is feasible as a QA dosimeter dedicated to electron beams.