Figure 2.

Dosimetric calibration using EBT4 films. (a) Dose-response curve for 6 MV-X photons on the red channel and respective 3rd degree polynomial fit. (b) Proton calibration curve associating the integrated beam charge in nC recorded by the electrometer with film proton dose in Gy and corresponding linear regression fit (4 independent irradiations). Polynomial and linear regression fits were calculated in GraphPad Prism 9.0. (c) Representative images of the proton-irradiated films along with respective integrated beam charges (nC) and absorbed doses (Gy).