A neutron with high kinetic energy, especially one released by nuclear fission and not slowed by any moderator.
- They'd worked with slow neutrons instead of fast neutrons.
- The normalizing factor for exposure to alpha particles is 20, for thermal neutrons is two, for fast neutrons is 10, for protons is 10, and for beta particles is one.
- Mutation rates after low linear energy transfer radiation, such as X rays, rays, and fast neutrons, have been extensively studied in plants.
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Syllabification: fast neu·tron
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