The Neutron source reference article from the English Wikipedia on 24-Apr-2004
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Neutron source

A neutron source is a device that emits neutrons, used in particle physics and to start of nuclear chain reactions. Usually, the neutron souce is high speed atoms hitting a metal of an isotope with many neutrons. This reaction can be seen as bright sparks, but the sparks each have many neutrons in them.

See also