Purpose: This study aims to evaluate a modified formalism for electron beam reference dosimetry and to compare the results with the cases of previous protocols TG-51 and TRS-398.
Methods: Measurements were performed using three types of cylindrical chambers (TW30013, FC65-G, and A1SL) and plane-parallel chambers (PPC) (Roos, Advanced Markus, and NACP-02) with electron beams of energies 6, 12, and 18 MeV. Absorbed dose to water at the reference depths was determined following the modified formalism using different chambers and methods, including the direct application of Co calibration or cross-calibration for PPCs in a high-energy electron beam.