“In the remote expanse of the Gobi desert stands the first thorium (Th) reactor ever built. Last year, researchers from the Chinese Academy of Sciences showed that this two-megawatt reactor could power up and operate without a glitch, and they have now achieved another first—successfully reloading it while it was still running. Thorium-232 (the isotope of thorium that most commonly occurs on its own) is not capable of undergoing fission by itself. By capturing an extra neutron, however, it can morph into protactinium, which decays into U-233…

Thorium is not only more abundant than uranium, but has the upside of not being as easy to weaponize. While the fission of Th-232 produces protinactium, which decays into U-233 and can be used in nuclear weapons, U-233 isn’t nearly as explosive as other isotopes (the isotope most commonly used in uranium explosives is U-235). There wouldn’t be much of a point in dealing it to create an illicit nuclear bomb.”

From Popular Mechanics.