• Neutron emission is not produced as a result of any convenient radioactive decay process.  Neutron sources are thus more limited and are based on either spontaneous fission or on nuclear reactions for which the incident particle is the product of a conventional decay process.
• There are four different categories of neutrons, depending on their energy:
  1. Fast neutrons
  2. Thermal neutrons
  3. Epithermal neutrons
  4. Cold neutrons
• There are also several different types of sources for producing neutrons:
  • Radioactive sources
  • Photo sources
  • Spontaneous fission
  • Accelerator sources
  • Deuteron stripping
  • Spallation
  • Reactor sources
  • Slow neutrons

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