|Composition of MOX fuel|
Composition of MOX fuel for a ton of metal (uranium + plutonium). The fissile isotopes (uranium-235, Plutonium-239 and 241) represent 4.3% of the total. Uranium-235 constitutes only 0.2%, since "depleted" uranium is used in the fabrication of MOX fuels. Plutonium isotopes are much more radioactive than those of uranium. They generate a much higher radioactivity than the enriched uranium fuels (UOX).