- Nuclear weapon
- Nuclear weapon: A device that releases nuclear energy in an explosive manner as the result of nuclear chain reactions involving fission, or fission and fusion, of atomic nuclei. Such weapons are also sometimes referred to as atomic bombs (a fission-based weapon); or boosted fission weapons (a fission-based weapon deriving a slightly higher yield from a small fusion reaction); or hydrogen bombs/thermonuclear weapons (a weapon deriving a significant portion of its energy from fusion reactions).
- Chemical Weapon (CW)
- The CW: The Organization for the Prohibition of Chemical Weapons defines a chemical weapon as any of the following: 1) a toxic chemical or its precursors; 2) a munition specifically designed to deliver a toxic chemical; or 3) any equipment specifically designed for use with toxic chemicals or munitions. Toxic chemical agents are gaseous, liquid, or solid chemical substances that use their toxic properties to cause death or severe harm to humans, animals, and/or plants. Chemical weapons include blister, nerve, choking, and blood agents, as well as non-lethal incapacitating agents and riot-control agents. Historically, chemical weapons have been the most widely used and widely proliferated weapon of mass destruction.
- Biological weapon (BW)
- Biological weapons use microorganisms and natural toxins to produce disease in humans, animals, or plants. Biological weapons can be derived from: bacteria (anthrax, plague, tularemia); viruses (smallpox, viral hemorrhagic fevers); rickettsia (Q fever and epidemic typhus); biological toxins (botulinum toxin, staphylococcus enterotoxin B); and fungi (San Joaquin Valley fever, mycotoxins). These agents can be deployed as biological weapons when paired with a delivery system, such as a missile or aerosol device.
- Deployment
- The positioning of military forces – conventional and/or nuclear – in conjunction with military planning.
- Ballistic missile
- A delivery vehicle powered by a liquid or solid fueled rocket that primarily travels in a ballistic (free-fall) trajectory. The flight of a ballistic missile includes three phases: 1) boost phase, where the rocket generates thrust to launch the missile into flight; 2) midcourse phase, where the missile coasts in an arc under the influence of gravity; and 3) terminal phase, in which the missile descends towards its target. Ballistic missiles can be characterized by three key parameters - range, payload, and Circular Error Probable (CEP), or targeting precision. Ballistic missiles are primarily intended for use against ground targets.
- Nonproliferation
- Nonproliferation: Measures to prevent the spread of biological, chemical, and/or nuclear weapons and their delivery systems. See entry for Proliferation.
- Treaty of Pelindaba
- Treaty of Pelindaba: The Treaty on the African Nuclear-Weapon-Free-Zone was opened for signature in Cairo in April 1996. The treaty prohibits the research, development, manufacturing, stockpiling, acquisition, testing, possession, control, and stationing of nuclear explosive devices on any member’s territory. The treaty also prohibits the dumping of radioactive waste originating from outside the continent within the region. In addition, the treaty requires parties to apply International Atomic Energy Agency safeguards to all their peaceful nuclear activities. The treaty also provides for the establishment of the African Commission on Nuclear Energy (AFCONE), which supervises treaty implementation and ensures compliance with its provisions. For additional information, see the ANWFZ.
- Ratification
- Ratification: The implementation of the formal process established by a country to legally bind its government to a treaty, such as approval by a parliament. In the United States, treaty ratification requires approval by the president after he or she has received the advice and consent of two-thirds of the Senate. Following ratification, a country submits the requisite legal instrument to the treaty’s depository governments Procedures to ratify a treaty follow its signature.
See entries for Entry into force and Signature.
- Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
- The NPT: Signed in 1968, the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) is the most widely adhered-to international security agreement. The “three pillars” of the NPT are nuclear disarmament, nonproliferation, and peaceful uses of nuclear energy. Article VI of the NPT commits states possessing nuclear weapons to negotiate in good faith toward halting the arms race and the complete elimination of nuclear weapons. The Treaty stipulates that non-nuclear-weapon states will not seek to acquire nuclear weapons, and will accept International Atomic Energy Agency safeguards on their nuclear activities, while nuclear weapon states commit not to transfer nuclear weapons to other states. All states have a right to the peaceful use of nuclear energy, and should assist one another in its development. The NPT provides for conferences of member states to review treaty implementation at five-year intervals. Initially of a 25-year duration, the NPT was extended indefinitely in 1995. For additional information, see the NPT.
- Non-nuclear weapon state (NNWS)
- Non-nuclear weapon state (NNWS): Under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), NNWS are states that had not detonated a nuclear device prior to 1 January 1967, and who agree in joining the NPT to refrain from pursuing nuclear weapons (that is, all state parties to the NPT other than the United States, the Soviet Union/Russia, the United Kingdom, France, and China).
- Nuclear-Weapon-Free Zone (NWFZ)
- NWFZ: A geographical area in which nuclear weapons may not legally be built, possessed, transferred, deployed, or tested.
- Disarmament
- Though there is no agreed-upon legal definition of what disarmament entails within the context of international agreements, a general definition is the process of reducing the quantity and/or capabilities of military weapons and/or military forces.
- Research reactor
- Research reactor: Small fission reactors designed to produce neutrons for a variety of purposes, including scientific research, training, and medical isotope production. Unlike commercial power reactors, they are not designed to generate power.
- International Atomic Energy Agency (IAEA)
- IAEA: Founded in 1957 and based in Vienna, Austria, the IAEA is an autonomous international organization in the United Nations system. The Agency’s mandate is the promotion of peaceful uses of nuclear energy, technical assistance in this area, and verification that nuclear materials and technology stay in peaceful use. Article III of the Nuclear Non-Proliferation Treaty (NPT) requires non-nuclear weapon states party to the NPT to accept safeguards administered by the IAEA. The IAEA consists of three principal organs: the General Conference (of member states); the Board of Governors; and the Secretariat. For additional information, see the IAEA.
- Safeguards
- Safeguards: A system of accounting, containment, surveillance, and inspections aimed at verifying that states are in compliance with their treaty obligations concerning the supply, manufacture, and use of civil nuclear materials. The term frequently refers to the safeguards systems maintained by the International Atomic Energy Agency (IAEA) in all nuclear facilities in non-nuclear weapon state parties to the NPT. IAEA safeguards aim to detect the diversion of a significant quantity of nuclear material in a timely manner. However, the term can also refer to, for example, a bilateral agreement between a supplier state and an importer state on the use of a certain nuclear technology.
See entries for Full-scope safeguards, information-driven safeguards, Information Circular 66, and Information Circular 153.
- Critical
- Critical: A state where the number of neutrons in each period of time, or generation, remains constant. When a nuclear reactor is “steady-state,” or operating at normal power levels for extended periods of time, it is in this state.
- Enriched uranium
- Enriched uranium: Uranium with an increased concentration of the isotope U-235, relative to natural uranium. Natural uranium contains 0.7 percent U-235, whereas nuclear weapons typically require uranium enriched to very high levels (see the definitions for “highly enriched uranium” and “weapons-grade”). Nuclear power plant fuel typically uses uranium enriched to 3 to 5 percent U-235, material that is not sufficiently enriched to be used for nuclear weapons.
- Radioisotope
- Radioisotope: An unstable isotope of an element that decays or disintegrates spontaneously, emitting energy (radiation). Approximately 5,000 natural and artificial radioisotopes have been identified. Some radioisotopes, such as Molybdenum-99, are used for medical applications, such as diagnostics. These isotopes are created by the irradiation of targets in research reactors.
- Low enriched uranium (LEU)
- Low enriched uranium (LEU): Refers to uranium with a concentration of the isotope U-235 that is higher than that found in natural uranium but lower than 20% LEU (usually 3 to 5%). LEU is used as fuel for many nuclear reactor designs.
- Reprocessing
- Reprocessing: The chemical treatment of spent nuclear fuel to separate the remaining usable plutonium and uranium for re-fabrication into fuel, or alternatively, to extract the plutonium for use in nuclear weapons.
- Plutonium (Pu)
- Plutonium (Pu): A transuranic element with atomic number 94, produced when uranium is irradiated in a reactor. It is used primarily in nuclear weapons and, along with uranium, in mixed-oxide (MOX) fuel. Plutonium-239, a fissile isotope, is the most suitable isotope for use in nuclear weapons.
- Additional Protocol
- The Additional Protocol is a legal document granting the International Atomic Energy Agency (IAEA) complementary inspection authority to that provided in underlying safeguards agreements. The principal aim is to enable the IAEA inspectorate to provide assurance about both declared and possible undeclared activities. Under the Protocol, the IAEA is granted expanded rights of access to information and sites, as well as additional authority to use the most advanced technologies during the verification process. See entry for Information Circular 540.
- Dual-use item
- An item that has both civilian and military applications. For example, many of the precursor chemicals used in the manufacture of chemical weapons have legitimate civilian industrial uses, such as the production of pesticides or ink for ballpoint pens.
- Biological and Toxin Weapons Convention (BTWC)
- The BTWC: The Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological (Biological) and Toxin Weapons and on Their Destruction (BTWC) prohibits the development, production, or stockpiling of bacteriological and toxin weapons. Countries must destroy or divert to peaceful purposes all agents, toxins, weapons, equipment, and means of delivery within nine months after the entry into force of the convention. The BTWC was opened for signature on April 10, 1972, and entered into force on March 26, 1975. In 1994, the BTWC member states created the Ad Hoc Group to negotiate a legally binding BTWC Protocol that would help deter violations of the BTWC. The draft protocol outlines a monitoring regime that would require declarations of dual-use activities and facilities, routine visits to declared facilities, and short-notice challenge investigations. For additional information, see the BTWC.
- UNSC Resolution 1540
- Resolution 1540 was passed by the UN Security Council in April 2004, calling on all states to refrain from supporting, by any means, non-state actors who attempt to acquire, use, or transfer chemical, biological or nuclear weapons or their delivery systems. The resolution also called for a Committee to report on the progress of the resolution, asking states to submit reports on steps taken towards conforming to the resolution. In April 2011, the Security Council voted to extend the mandate of the 1540 Committee for an additional 10 years.
- Al-Qaeda or Al-Qa’ida
- Al-Qaeda or Al-Qa'ida: A radical Islamist terrorist organization established by Osama bin Laden (now deceased), responsible for a number of attacks in the United States and worldwide, including the September 11, 2001 attacks on the World Trade Center and Pentagon. Al-Qa'ida means “the base” in Arabic, and acts as an umbrella organization for a number of terrorist groups around the world. The organization’s current leader is Ayman al-Zawahiri.
- Plague
- Plague: The disease caused by the bacterium Yersinia pestis. There are three forms of plague: bubonic plague, pneumonic plague, and septicemic plague. Bubonic plague refers to infection of the lymph nodes by Y. pestis, causing black sores or “buboes,” pneumonic plague refers to infection of the lungs, and septicemic plague refers to infection of the bloodstream. Although no longer a serious public health hazard in the developed world, the bacterium can spread from person-to-person in aerosolized form, and has been investigated as a biological weapon by Japan and the Soviet Union.
- Chemical Weapons Convention (CWC)
- The Chemical Weapons Convention (CWC) requires each state party to declare and destroy all the chemical weapons (CW) and CW production facilities it possesses, or that are located in any place under its jurisdiction or control, as well as any CW it abandoned on the territory of another state. The CWC was opened for signature on 13 January 1993, and entered into force on 29 April 1997. For additional information, see the CWC.
- Organization for the Prohibition of Chemical Weapons (OPCW)
- The OPCW: Based in The Hague, the Netherlands, the OPCW is responsible for implementing the Chemical Weapons Convention (CWC). All countries ratifying the CWC become state parties to the CWC, and make up the membership of the OPCW. The OPCW meets annually, and in special sessions when necessary. For additional information, see the OPCW.
- Cruise missile
- An unmanned self-propelled guided vehicle that sustains flight through aerodynamic lift for most of its flight path. There are subsonic and supersonic cruise missiles currently deployed in conventional and nuclear arsenals, while conventional hypersonic cruise missiles are currently in development. These can be launched from the air, submarines, or the ground. Although they carry smaller payloads, travel at slower speeds, and cover lesser ranges than ballistic missiles, cruise missiles can be programmed to travel along customized flight paths and to evade missile defense systems.
- Strategic nuclear warhead
- Strategic nuclear warhead: A high-yield nuclear warhead placed on a long-range delivery system, such as a land-based intercontinental ballistic missile (ICBMs), a submarine-launched ballistic missile (SLBMs), or a strategic bomber.
- International Code of Conduct Against Ballistic Missiles (ICOC)
- ICOC: A legally non-binding arrangement that was launched with the objective of preventing and curbing the proliferation of ballistic missile systems capable of delivering weapons of mass destruction. States adhering to the ICOC agree not to assist ballistic missile programs in countries suspected of developing biological, chemical, and nuclear weapons, as well as to exhibit "restraint" in the development and testing of their own ballistic missiles. It eventually became the Hague Code of Conduct Against Ballistic Missiles (HCOC). For additional information, see the HCOC.