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This document presents a comparison between the AAPM Task Group 51 (TG-51) and Task Group 21 (TG-21) calibration protocols for photon and electron beams in water using cylindrical chambers. The study indicates a roughly 1% discrepancy between the absorbed-dose to water determined by TG-51 and that determined by TG-21, with variations observed based on electron energy. The findings suggest that the implementation of TG-51 may lead to changes in clinical reference dosimetry outputs, particularly for high-ener

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evan.porter

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EN