Investigation of Modification of the Internal Surface of Polysulfone Hollow Fiber Channels under Their Irradiation by a 10-keV Electron Beam

The results of spectral analysis of the surface of polysulfone fiber (channel) after transmission of a 10-keV electron beam through it are presented in this work. This work is a continuation of the study of the dependence of the quantity of electrons transmitted without loss of energy through the array formed of polysulfone hollow fibers, on the angle of rotation of the array about the vertical axis. Data of the analysis demonstrates significant modification of the internal surface of the channel after its electron irradiation. It is made clear that, in the case of the long-term irradiation of polysulfone tubes by charged-particle beams, a dark coating is formed on the surface layer of the channel which can have a significant impact on the transmission capacity and controllability of the channels in the context of the control of charged particles. Comparison of the elemental composition of the surface of the fiber before and after the grazing interaction of a beam of electrons with an energy of 10 keV with it reveals an increase in the carbon concentration in the irradiated fiber of 50 wt %, and an oxygen content increase of 40 wt %. The sulphur amount does not change, and remains at the level of about 10 wt % both in the irradiated and in nonirradiated sample.