Alpha Particle - MSN Encarta

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Alpha particle - Wikipedia, the free encyclopedia
Alpha particles (named after and denoted by the first letter in the Greek alphabet , α) consist of two protons and two neutrons bound together into a particle identical to a ...
Alpha particle X-Ray spectrometer - Wikipedia, the free encyclopedia
An Alpha Particle X-Ray Spectrometer ( APXS ) (or Alpha Proton X-Ray Spectrometer for the Pathfinder mission ) is a device that analyses the chemical element composition of a ...
alpha particle - Definitions from Dictionary.com
Definitions of alpha particle at Dictionary.com. ... a positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission; the ...

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Alpha Particle, positively charged nuclear particle, symbol a, consisting of two protons bound to two neutrons. Alpha particles are emitted spontaneously in some types of radioactive decay (see Radioactivity). They are also produced when helium-4 atoms are completely ionized (see Ion; see Ionization). Alpha particles are also notated ¸He«⁺.

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