What is an e-beam?
Electron Beam Irradiation Electron beam (E-Beam) irradiation is a form of ionizing energy that is characterized by its low penetration and high-dosage rates. The beam – a concentrated, highly charged stream of electrons – is generated by accelerators capable of producing continuous or pulsed beams.
How does e-beam work?
E-BEAM Services uses high power state of the art accelerators to create a powerful beam of electrons. The beam is scanned back and forth to create a curtain of fast electrons, which shower and safely ionize the materials that they strike. There is no radioactivity involved.
How are e beams generated?
Electrons are generated by heating a filament. A voltage gradient draws the electrons away from the filament and accelerates them through a vacuum tube. The resultant beam can then be scanned by means of an electromagnet to produce a “curtain” of accelerated electrons.
What type of radiation is E-beam?
ionizing radiation
Gamma, x-ray, and e-beam are examples of ionizing radiation, whereas microwaves, radiowaves, and UV are considered nonionizing.
What is the difference between E beam and gamma sterilization?
E-beam irradiation is very similar to gamma radiation sterilization as being an ionizing energy but the difference is its high dosage rates and low penetration. Another difference is the use of e-beams which has a source of electricity producing high charge of electrons.
Why are electron beams used?
Electron beams are used chiefly in research, technology, and medical therapy to produce X rays and images on television screens, oscilloscopes, and electron microscopes.
Why tungsten is used in electron gun?
Tungsten is a suitable metal for Thermionic emission, has a high melting point of 3655 K but its work function is high at about 4.52 eV(electron volt-energy unit). It starts emission at 2500 K. If thoriated tungsten (coated with carbon and thorium) is used work function reduces to 2.6 eV and emission begins at 2000 K.
Which filament is used in electron gun?
tungsten
Gun Assembly As in scanning electron microscopy (SEM), the electron beam is generated by the electron gun (EG). Electrons emitted by a heated filament of tungsten or lanthanum hexaboride (LaB6) (thermionic process) or by field emission (FE) source are focalized at a crossover point by a Wehnelt cylinder.
How does the e-beam work?
As the product/material being sterilized passes the E-Beam, energy from the electrons is absorbed, altering various chemical bonds, damaging the DNA, and destroying the reproductive capabilities of the microorganisms.
What do I need to get started with e-beam resist?
Trained & Qualified on using the WNF chemical wet benches, so you can spin & develop e-beam resist. You’ll need to use resists, developers, and strippers (solvent and bases). You’ll need to use the resist spinners, the baking hot plates, and general wet chemistry hoods. Trained & Qualified to use a resist spinner.
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