Government agency means any executive department, commission, independent establishment, corporation, wholly or partly owned by the United States of America, which is an instrumentality of the United States, or any board, bureau, division, service, office, officer, authority, administration, or other establishment in the executive branch of the Government. High enriched uranium means uranium enriched to 20 percent or greater in the isotope uranium-235. Item means any discrete quantity or container of special nuclear material or source material, not undergoing processing, having an unique identity and also having an assigned element and isotope quantity. License , except where otherwise specified, means a license issued pursuant to part 70 of this chapter. Low enriched uranium means uranium enriched below 20 percent in the isotope uranium-235.
Material means special nuclear material.
Material access area means any location which contains special nuclear material, within a vault or a building, the roof, walls, and floor of which constitute a physical barrier. Material control test means a comparison of a pre-established alarm threshold with the results of a process difference or process yield performed on a unit process. Material in process means any special nuclear material possessed by the licensee except in unopened receipts, sealed sources, measured waste discards, and ultimate product maintained under tamper-safing. Measurement includes sampling and means the determination of mass, volume, quantity, composition or other property of a material where such determinations are used for special nuclear material control and accounting purposes. Measurement system means all of the apparatus, equipment, instruments and procedures used in performing a measurement.