Thorium fueled reactors may pose a slightly higher proliferation risk than uranium based reactors because, while Pu-239 will fairly often fail to undergo fission after neutron capture and produce Pu-240, the corresponding process in the thorium cycle is relatively rare.
Thorium fueled. Reactors may pose a slightly higher proliferation risk than uranium. This uranium is based reactors because, while Pu-239 will fairly often fail to undergo fission after neutron capture and produce Pu-240 is relatively rare.240 was the corresponding process in the thorium cycle.