 The neutron from the second branch has an energy of only , whereas the neutron from the D-T reaction has an energy of , resulting in a wider range of isotope production and material damage.When the tritons are removed quickly while allowing the 3He to react, the fuel cycle is called "tritium suppressed fusion" The removed tritium decays to 3He with a 12.5 year half life.By recycling the 3He produced from the decay of tritium back into the fusion reactor, the fusion reactor does not require materials resistant to fast neutrons.