He3 is harder to come by than D2 as the primary fuel. The D2+D2 reaction takes off in two paths. If we assume the innovation was the ability to strip out the T3 that results from one of the paths, then we only have to deal with low energy neutrons around 2.4MeV. The other reaction path produces He3 and we fuse that with D2 and get no neutrons from a secondary reaction. This would require the team to vent the radioactive T3 from time to time, but it does have a really short half-life.
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