For Electron beam, see Cathode ray. Electron-beam processing or electron irradiation beam modification devices in radiotherapy pdf a process that involves using beta radiation, usually of high energy, to treat an object for a variety of purposes.
This may take place under elevated temperatures and nitrogen atmosphere. Possible uses for electron irradiation include sterilization and cross-linking of polymers. Electron energies typically varies from the keV to MeV range, depending on the depth of penetration required.
The basic components of a typical electron-beam processing device are illustrated in the figure. After exiting the gun, the beam passes through an electromagnetic lens and deflection coil system. The lens is used for producing either a focused or defocused beam spot on the workpiece, while the deflection coil is used to either position the beam spot on a stationary location or provide some form of oscillatory motion.
The result is a change in the properties of the polymer, which is intended to extend the range of applications for the material. The effects of irradiation may also include changes in crystallinity, as well as microstructure. Usually, the irradiation process degrades the polymer.
The irradiated polymers may sometimes be characterized using DSC, XRD, FTIR, or SEM. Electron-beam accelerators utilize an on-off technology, with a common design being similar to that of a cathode ray television. Sterilization of medical and pharmaceutical goods. Nanotechnology is one of the fastest-growing new areas in science and engineering.