Gómez Rodríguez, FaustinoGonzález Castaño, Diego MiguelGómez Fernández, NicolásPardo Montero, JuanSchüller, AndreasGasparini, AlessiaVanreusel, VerdiVerellen, DirkFelici, GiuseppeKranzer, RafaelPaz Martín, José2022-09-212022-09-212022Med Phys.2022;49:4705–47142313-4712http://hdl.handle.net/10347/29236Conventional air ionization chambers (ICs) exhibit ion recombination correction factors that deviate substantially from unity when irradiated with dose per pulse magnitudes higher than those used in conventional radiotherapy. This fact makes these devices unsuitable for the dosimetric characterization of beams in ultra-high dose per pulse as used for FLASH radiotherapyeng© 2022 The Authors. Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine. This is an open access article under the terms of the Creative Commons Attribution License,which permits use,distribution and reproduction in any medium,provided the original work is properly citedAtribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/FLASH radiotherapyIonization chamberUltra-high dose ratejournal article10.1002/mp.15668open access