Creation
Charged particles such as electrons, positrons, and protons may be separated from their common surrounding. This can be accomplished by e.g. thermionic emission or arc discharge. The following devices are commonly used as sources for particle beams:
- ion source
- cathode ray tube, or more specifically in one of its parts called electron gun. This is also part of traditional television and computer screens.
- photocathodes may also be built in as a part of an electron gun, using the photoelectric effect to separate particles from their substrate.
- Neutron beams may be created by energetic proton beams which impact on a target, e.g. of beryllium material. (see article Particle therapy).
Read more about this topic: Particle Beam
Famous quotes containing the word creation:
“Without culture, and the relative freedom it implies, society, even when perfect, is but a jungle. This is why any authentic creation is a gift to the future.”
—Albert Camus (1913–1960)
“If they had said that the sun or the moon had gone out of the heavens, it could not have struck me with the idea of a more awful and dreary blank in creation than the words: “Byron is dead!””
—Jane Welsh Carlyle (1801–1866)
“A fact is the end or last issue of spirit. The visible creation is the terminus or the circumference of the invisible world.”
—Ralph Waldo Emerson (1803–1882)