The IAEA considers thorium and certain isotopic enrichment
ranges of uranium to be source material:
- uranium containing the mixture of isotopes occurring in
nature
- uranium depleted in the isotope 235
- thorium
- any of the foregoing in the form of metal, alloy, chemical
compound, or concentrate
- any other material containing one or more of the foregoing in
such concentration as the Board of Governors shall from time to
time determine
- and such other material as the Board of Governors shall from
time to time determine
"The term source material shall not be interpreted as
applying to ore or ore residue. Any determination by the Board
which adds to the materials considered to be source material or
special fissionable material shall have effect under only upon
acceptance by the State" (INFCIRC 153*).
