The Focus Fusion Society › Forums › Dense Plasma Focus (DPF) Science and Applications › Shielding alternatives › Reply To: Toshiba's "Micro Nuclear Reactor" – it's not fusion, but it's here now
the water moderates neutrons, so even the odd fast-neutron will be slowed through it; the boron captures neutrons; the lead captures gammas. all this brings it down to background level.
