Features of Polytetrafluoroethylene Application in High-Dose Dosimetry of Accelerated Protons by the Method of Electron Paramagnetic Resonance

EPR — a high-dose dosimetry method for use in monitoring radiation technologies has been tested for a proton beam with an energy of 18 MeV using a domestic brand of polytetrafluoroethylene as a radiation detector and an original EPR spectrometer. It has been shown that the dose range of the EPR signal is limited to 1.5 MGy, after which saturation occurs. Doses exceeding this value can be measured using additional signals in the EPR spectrum. It was found that irradiation of the detectors leads to their gamma radioactivity. The energy of the gamma radiation and the half-life of the source corresponded to the isotope 18F obtained in the nuclear reaction 18O(p, n)18F, which indicated the presence of oxygen in the detector material, which determines their paramagnetic properties.