Alpha Particle - ninemsn 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 helium ...
Radioctivity - Alpha Particle Scattering
A computer software simulation of the penetration and back scattering of alpha particles at different energies and through different materials and thicknesses.
Radioactivity
Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two ...

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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. They consist of completely ionized helium-4 atoms (see Ionization).