Session

Overview: The dosimetry code of practice TRS-483, jointly produced by the IAEA and AAPM in 2017, provided essential guidance on the choice of detectors and methodologies in the determination of dose in small static MV photon fields. Dose determination under more complex irradiation geometries are yet to be addressed. Further to this, recent technological developments utilising narrow collimated fields delivered at dose rates higher than the conventional, pose additional challenges. This symposium aims to provide insight and present current efforts to address these. FLASH radiotherapy has recently gained major interest. Commercial systems are becoming available for clinical use and clinical trials are commencing for both electron and proton therapy. FLASH brings unique challenges to dosimetry, beam control, and verification. The dosimetric issues specific to FLASH and methods and detectors capable of operating under high dose rate conditions will be reviewed.