Abstract
Abstract
Volumetric modulated arc therapy represents the latest
technology in radiotherapy. It involves continuous modification of
the multi-leaf collimator spatial distribution, dose rate, and
gantry rotational speed, necessitating a dosimeter with high spatial
resolution and exceptional sensitivity per unit volume. In
particular, cesium-based inorganic perovskites have been studied for
various applications, spanning from photoconductor solar cells to
radiation detectors. These perovskites are renowned for their
outstanding attributes, including thermal stability, inorganic
stability, and light absorption capacity. Despite such advantageous
characteristics, CsPbI3 materials have only been investigated
in radiodiagnostics, with limited exploration in radiotherapy. To
address this gap, this study verified the viability of CsPbI3
materials, note for their outstanding radiation detection
efficiency, as dosimeters capable of measuring the radiation
detection performance for radiotherapy devices. The reproducibility,
linearity, and percent depth dose (PDD) were evaluated under the
application of photon and electron beams in linear accelerators. The
reproducibility assessment revealed impressive results, with the
relative standard deviation registering at 0.53%, 0.32%, and
0.38% under electron beam energies of 6, 9, and 12 MeV and 0.45%,
and 0.89% under photon beam energies of 6 and 15 MV. Moreover, the
linearity test revealed an R
2 value of 0.9999, indicating high
linearity, at 6, 9, and 12 MeV and at 6 and 15 MV. The PDD graphs
drawn for the CsPbI3 dosimeter fabricated in this study showed
that the D
max points were consistent. The novel
CsPbI3 dosimeter demonstrated a level of detection performance
that satisfied all criteria; reproducibility, linearity, and
PDD. The results collectively indicated that the CsPbI3
dosimeter can be used for dosimeters in radiotherapy devices.