Calibration means the process of determining the numerical relationship between the observed output of a measurement system and the value, based upon reference standards, of the characteristic being measured. Commission means the Nuclear Regulatory Commission or its duly authorized representatives. Continuous process means a unit process in which feed material must be introduced in a systematic manner in order to maintain equilibrium conditions. Controlled access area means any temporarily or permanently established area which is clearly demarcated, access to which is controlled, and which affords isolation of the material or persons within it. DOE means the U.S. Department of Energy or its duly authorized representatives.
Element means uranium or plutonium.
Estimate means a specific numerical value arrived at by the application of an estimator. Estimator means a function of a sample measurement used to estimate a population parameter. 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.