“Dude - the U233 is the neutron emitter that breeds the Thorium for decay.”
The U233 is a neutron ABSORBER that fissions to produce the energy.
Below is the list of fissile materials:
Fissile nuclides in nuclear fuels include:
Uranium-235 which occurs in natural uranium and enriched uranium
Plutonium-239 bred from uranium-238 by neutron capture
Plutonium-241 bred from plutonium-240 by neutron capture. The 240Pu comes from 239Pu by the same process.
Uranium-233 bred from thorium-232 by neutron capture
http://en.wikipedia.org/wiki/Uranium-233
Thorium Fuel Cycle