vansig wrote: What Focus Fusion is attempting, is aneutronic fusion.

D+3He itself is an aneutronic reaction too.
Hypothetical fusion reactor using this mix would actually produce some neutron flux due to D+D side reactions.
However this flux should be several orders of magnitude lower than D+T, if the reactor keeps the fusion temperature optimal for the best D+3He reaction rate

to topic starter: as for mining Moon for 3He – hmmm, I think it would be worth to return to this idea in… say 20-30 years.
when we have at least working D-T fusion.
or may be never return to it if we have working p-B11 🙂