from the thorium energy blog, using thorium as the fertile material and U-233 as the fissile material has a secret advantage in the “proliferation” department–the inevitable formation of uranium-232.
There is a “fact sheet” about thorium issued by the Institute for Energy and Environmental Research (IEER) and Physicians for Social Responsibility (PSR) called “Thorium Fuel: No Panacea for Nuclear ...
In 1980, the International Atomic Energy Agency (IAEA) observed that protactinium, a chemical element generated in thorium reactors, could be separated and allowed to decay to isotopically pure ...