Dosimetry Response Characterization of a New Developed Self-Powered Halide Perovskites Radiation Detector Under Proton Irradiation.
Abstract
Purpose
Halide perovskites, particularly CsPbBr3, present an exciting opportunity to overcome these limitations due to their high atomic number, fast charge transport, and exceptional radiation tolerance. While perovskite detectors have shown promise for low-energy x-ray detection (<100 keV), their potential for proton dosimetry remains largely unexplored. This work developed a perovskite-based detectors as a transformative platform for real-time dosimetry in clinical settings.
Methods
A perovskite film with 0.3 mm thickness was coated on a base layer of indium tin oxide (ITO) electrodes. The sample was irradiation with proton beams using a Mevion Hyperscan S250i proton unit, and the 75 kVp x-ray source were used for the sample’s data collection check before the proton irradiation. The resulting charges under irradiation were collected and amplified by a preamplifier, then displayed on an oscilloscope. Dose-response curves were compared for different MUs and proton energies. The temporal resolution was tested by using the proton beam’s pulse structure of the proton system.
Results
The time resolution of the current could follow the dose time very well. As we increase the dosage from 1cGy to 50 cGy, we can clearly resolve the increase of pulse numbers, which are directly related to the proton beam pulses from the synchrocyclotron. The 1.35 ms pulse interval time was successfully monitored by the perovskite sample. The response of MU and dose linearity was well recorded with strong correlation (R2 = 0.97).
Conclusion
Our initial prototype devices demonstrated stable dark current and promising short-circuit current under clinical proton beam. It is worthy to continue the dosimetry response study to develop a new self-powered dosimeter. Our initial prototype devices demonstrated stable dark current and promising short-circuit current under clinical proton beam. It is worthy to continue the dosimetry response study to develop a new self-powered detector for radiation dosimetry.