D-T: Where you get all those energized neutrons is easy: from D-T fusion. You need a neutron multiplier like lead or beryllium, then it looks like you can avera

D-T: Where you get all those energized neutrons is easy: from D-T fusion. You need a neutron multiplier like lead or beryllium, then it looks like you can average about 1.15 tritium atoms per D-T reaction. Helion: to use their tritium they just have to wait. Tritium decays to He3 with a 12-year half-life. (Of course if they didn't want to use the tritium at all, it would just mean building twice as many D-D reactors and it'd still work. That'd be silly though.)