Characterization of Gafchromic^TM EBT4 film with clinical kV/MV photons and MeV electrons

A newly developed GafchromicTM EBT4 film model was released recently. According to the vendor-stated specifications, this new maintains major features of its more recent predecessor, EBT3, but has a great improvement in signal-to-noise ratio (SNR). The purpose study fully characterize by testing dose response dependence on beam energy using clinical photon and electron beams validating SNR. In experiments, 6 MV 15 beams, MeV, 12 MeV 20 120 kVp two 250 x-ray (with different half-layer values) were selected, representing energies radiation types. noise SNR analyses, only selected as representative compare between EBT3 models. test results showed that there slight difference (<2% at most levels) among photons electrons. However, large deviation (>10%) found for beam. For moderate (<5%), not negligible. reduced strengthened EBT4. We conclude minimal notable kilovoltage improved are validated.