Self-developing radiochromic film is widely used in radiotherapy QA procedures. To compensate for typical inhomogeneities, the triple channel analysis method commonly photon-irradiated film. We investigated applicability of this GafchromicTMEBT3 (Ashland) irradiated with a clinically carbon-ion beam. Calibration curves were taken from EBT3 specimens monoenergetic beams different doses. Measurem...