Abstract
When measuring the absorbed dose from a proton beam, the beam quality correction factor provided by IAEA TRS-398 has been used. However, that factor calculates the absorbed dose by applying the same value to clinical dosimetry without considering the initial energy of the radiation particle or the energy spectrum at the measurement position. In this study, the beam quality correction factors for the PTW 30013 farmer chamber and the PTW Advanced Markus chamber are calculated by using the TOPAS Monte Carlo simulation program to implement various clinical proton beam conditions of the National Cancer Center. In both chamber simulations, the quality correction factor measured at the Spread-Out Bragg Peak (SOBP) region shows a good agreement with the quality correction factors suggested by TRS-398. However, the quality correction factor increases at a single Bragg Peak region by 2.4% for the PTW Advanced Markus chamber and 7.1% for the PTW 30013 farmer chamber in the clinical dosimetry scenarios. The precise measurement of beam quality correction factors for mono-energy proton beams using the Monte Carlo technique is required in future studies.
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Acknowledgements
This work was supported by National Cancer Center Research Grant 2110380-2 ”Study of beam scanning nozzle and dosimetry method for the next generation Flash particle therapy” and the Korea Research Institute of Standards and Science (KRISS), the research program of ”Proton beam (double scattered) water absorbed dose precision measurement technology development.”
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Kwon, YC., Pak, SI., Jo, HS. et al. A study of the beam quality correction factor in clinical proton beam conditions using Monte Carlo simulations. J. Korean Phys. Soc. 81, 1128–1134 (2022). https://doi.org/10.1007/s40042-022-00573-0
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DOI: https://doi.org/10.1007/s40042-022-00573-0