Evaluation of radiation detection sensors and quality assurance relative dosimeters fabricated using methylammonium lead iodide for brachytherapy

Abstract Methylammonium lead iodide (MAPbI 3 ) perovskite is a well-known organic-inorganic lead halide perovskite that has gained much attention because of its advantages such as a high absorption coefficient for radiation absorption, high carrier mobility, high defect tolerance, and outstanding solution processability. In this study, we aimed to fabricate radiation detection sensors and relative dosimeters using MAPbI 3 and evaluate their applicability as quality assurance (QA) equipment for brachytherapy. MAPbI 3 film dosimeters of various thicknesses were fabricated, and their responses to Iridium-192 source were evaluated to determine the suitable thickness for radiation detection sensors. Additionally, the ability to use the fabricated QA relative dosimeter for brachytherapy was determined based on the results of reproducibility and linearity evaluations. The evaluation of the reproducibility of the fabricated MAPbI 3 radiation detection sensors with thicknesses of 150 and 225 μm showed standard deviations of 0.51% and 1.14%, respectively, which met the evaluation criterion of ≤ 1.5%. The evaluation of linearity indicated R 2 values of 0.9999 and 0.9998, respectively, which met the criterion of ≥ 0.9990. The results clearly demonstrated that the MAPbI 3 dosimeter fabricated during this study may be used as a QA relative dosimeter for brachytherapy.