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The neutron detection temperature, also called the neutron energy, indicates a free neutron 's kinetic energy, usually given in electron volts. The term temperature is used, since hot, thermal and cold neutrons are moderated in a medium with a certain temperature.pithermal neutrons have energies between 1 eV and 10 keV and smaller nuclear cross sections than thermal neutrons.
The isotope 232 Th, although not fissionable with thermal neutrons, is a possible energy source because it absorbs thermal neutrons to produce long-lived 233 U, which also undergoes thermal neutron fission with a high probability. Thus the big three readily fissionable nuclei are: 235 U, 239 Pu, and 233 U. Fig. 14-2.