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fast fission  

Definition

  • Fast fission is fission that occurs when a heavy atom absorbs a high-energy neutron, called a fast neutron, and splits. Most fissionable materials need thermal neutrons, which move more slowly. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Fast_fission)

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http://data.loterre.fr/ark:/67375/MDL-LG4WW26R-Z

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