Not normally enough to worry even with DD fuel. Since a prototype would be with plan H there would be none. But then again they can yield up to 3×10^11 neutrons. Probably best to be prudent.

The biggest danger is high voltage, xrays and vacuum chambers in that order. Nothing that can’t be safe if your not silly. The High voltage source is typically the hardest thing to get if you have a budget. Good vacuum is hard to do without some good equipment and some good procedures.