Uranium enrichment for nuclear fuel increases the concentration of U235, the fissionable isotope
that makes bombs and reactors go boom.
Well over 20 percent of HEU is in the form of the fissionable isotope
Sanders explains, "Depleted uranium is essentially U-238, the isotope after the fissionable isotope
, U-235, has been extracted from uranium ore.
Caesium-137, or radiocaesium, is a radioactive isotope of Caesium formed as one of the more common fission products by the nuclear fission of Uranium-235 and other fissionable isotopes
in nuclear reactors and nuclear weapons.
Uranium, in its natural form, contains too low a concentration of fissionable isotopes
to be used as fuel for reactors or weapons material and must be put through an enrichment process.