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.
... DB is the abbreviation for Deutsche Bahn, the major German railway company
DB is the abbreviation of Dominion Breweries[?], a major beer brewing company of New ...