thorium is not very weaponizable. it's great for power plants on the other hand, and we have simply oodles of it laying around the country. check the waste piles of any coal-based power plant. too bad we don't actually use it for power plants, considering that we have enough laying around to power the US for a century or so. though, i suppose you could always go low-tech and clonk someone over the head with a chunk of it.