> But you're saying with a clean design & boron based neutron absorbing buffer layer, we could limit neutron activation of the surrounding rock? Yes, but if t

> But you're saying with a clean design & boron based neutron absorbing buffer layer, we could limit neutron activation of the surrounding rock? Yes, but if the bomb is surrounded by a blanket of boron, it will absorb most of the fusion neutrons. Not _all_, but a significant part of them. The budget is actually not unreasonable. Fusion warhead scaling is easy, especially if you are not worried about practicalities for combat applications. You just keep on adding bigger stages. And a boron blanket is literally a boron blanket. You can't do any real engineering for it, it's going to become a highly ionized plasma within the first moments of the explosion, held together only by inertia.