"Refers to the process of blending down HEU to LEU. This is done by mixing HEU and the blendstock (of natural, depleted, or slightly enriched uranium) in either liquid or gas form." (NTI)

 "The application of nuclear security measures proportionate to the potential consequences of criminal or intentional unauthorized acts involving or directed at nuclear material, other radioactive material, associated facilities or associated activities or other acts determined by the State to have an adverse impact on nuclear security." [..]

Convention on the Physical Protection of Nuclear Material: "The amended Convention makes it legally binding for States Parties to protect nuclear facilities and material in peaceful domestic use, storage as well as transport. It also provides for expanded cooperation between and among States regarding rapid measures to locate and recover stole [..]

 "A process in which neutrons are absorbed by fissionable material and the neutrons released as a result of fission go on to cause more fissions.  A self-sustaining chain reaction is one where the number of neutrons released from fission in one period of time (or generation) is enough to cause the same number of fissions in the following gener [..]

 "Obliges parties to ensure that during international transport across their territory, or on ships or aircraft under their jurisdiction, civil nuclear materials are protected according to agreed standards. The convention also provides a framework for international cooperation on the protection, recovery, and return of stolen nuclear material, [..]

 "A U.S. Department of Defense (DOD) program established in 1992 by the U.S. Congress, through legislation sponsored primarily by Senators Sam Nunn and Richard Lugar. It was the largest and most diverse U.S. program addressing former Soviet Union weapons of mass destruction threats. The program focused primarily on: (1) destroying vehicles for [..]

 "A states' DBT is a description of the attributes and characteristics of potential insider and/or external adversaries who might attempt unauthorized removal of nuclear material or sabotage against which a physical protection system is designed and evaluated." (IAEA)

 "A “dirty bomb” is one type of a radiological dispersal device that combines conventional explosives, such as dynamite, with radioactive material." (NRC)

 "National laws or international arrangements established to restrict the sale of certain goods to certain countries, or to ensure that safeguards or end-use guarantees are applied to the export and sale of sensitive and dual-use technologies and materials." (NTI)

 "A type of fissionable material capable of sustaining a chain reaction by undergoing fission upon the absorption of low-energy (or thermal) neutrons.  Uranium-235, Plutonium-239, and Uranium-233 are the most prominently discussed fissile materials for peaceful and nuclear weapons purposes." (NTI)