The term ''atomic weapon'' means any device utilizing atomic energy, exclusive of the means for transporting or propelling the device (where such means is a separable and divisible part of the device), the principal purpose of which is for use as, or for development of, a weapon, a weapon prototype, or a weapon test device.

The term ''atomic energy'' means all forms of energy released in the course of nuclear fission or nuclear transformation.

The term ''special nuclear material'' means (1) plutonium, uranium enriched in the isotope 233 or in the isotope 235, and any other material which the Atomic Energy Commission determines to be special nuclear material, but does not include source material; or (2) any material artificially enriched by any of the foregoing, but does not include source material.

The term ''source material'' means (1) uranium, thorium, or any other material which is determined by the Commission to be source material; or (2) ores containing one or more of the foregoing materials, in such concentration as the Commission may by regulation determine from time to time.