Certainly it's possible, but it's much harder to do without frying either the triggers or the engineers (gamma rays and people don't play well together), so the

Certainly it's possible, but it's much harder to do without frying either the triggers or the engineers (gamma rays and people don't play well together), so the conventional wisdom is that non-thorium fuel sources would be lower-hanging fruit, and the pool of actors who could potentially make a bomb with it (or the U233 from further down the fuel cycle) is smaller than with plutonium or enriched uranium. "Proliferation-resistant" is the claim, not "proliferation-proof."