We have a document on this but I have to find it. Therre are two minor reactions. In one, the alphas, which are still trapped in the plasmoids, undergo another reaction with the boron and produce very low energy neutrons, which msut be shielded agaisnt but are too feeble to create activation in the materails we are using. We calculated that you could carry the Be anode in your pocket after it was exposed for a year.The other is a very high energy p B11 reaction whihc produces C11, with a very short lifetime (20 minutes). That is what has to decay before the device can be serviced. I know of no other fuel that produces fewer neutrons, and the main reaction pB11->3 He4 does in fact produce none.
