Nuclear weapon

The mushroom cloud of the atomic bombing of Nagasaki, Japan, 1945, rose some 18 kilometers (11 mi) above the hypocenter

A nuclear weapon is a type of explosive weapon that derives its destructive force from nuclear reactions of fusion or fission. As a result, even a nuclear weapon with a small yield is significantly more powerful than the largest conventional explosives, and a single weapon is capable of destroying an entire city.

In the history of warfare, two nuclear weapons have been detonated — both by the United States, during the closing days of World War II. The first was detonated on the morning of 6 August 1945, when the United States dropped a uranium gun-type device code-named "Little Boy" on the Japanese city of Hiroshima. The second was detonated three days later when the United States dropped a plutonium implosion-type device code-named "Fat Man" on the city of Nagasaki. These bombings resulted in the immediate deaths of around 120,000 people from injuries sustained from the explosion and acute radiation sickness, and even more deaths over time from long-term effects of radiation. The use of these weapons was and remains controversial. (See Atomic bombings of Hiroshima and Nagasaki for a full discussion.) Since the Hiroshima and Nagasaki bombings, nuclear weapons have been detonated on over two thousand occasions for testing purposes and demonstration purposes. The only countries known to have detonated such weapons are (chronologically) the United States, the Soviet Union, the United Kingdom, France, the People's Republic of China, India, Pakistan, and North Korea.

Various other countries may hold nuclear weapons but have never publicly admitted possession, or their claims to possession have not been verified. For example, Israel has modern airborne delivery systems and appears to have an extensive nuclear program with hundreds of warheads (see Israel and weapons of mass destruction), officially maintains a policy of "ambiguity" with respect to its actual possession of nuclear weapons. According to some estimates, it possesses as many as 200 nuclear warheads. Iran currently stands accused by the United States of attempting to develop nuclear weapons capabilities, though its government states that its acknowledged nuclear activities, such as uranium enrichment, are for non-weapons purposes. South Africa also secretly developed a small nuclear arsenal, but disassembled it in the early 1990s. (For more information see List of states with nuclear weapons.)

Apart from their use as weapons, nuclear explosives have been tested and used for various non-military uses. Synthetic elements, such as einsteinium and fermium, created by neutron bombardment of uranium and plutonium during thermonuclear explosions, were discovered in the aftermath of the first hydrogen bomb test.

History

Main article: History of nuclear weapons

The aftermath of the atomic bombing of Hiroshima

The first nuclear weapons were created in the United States by an international team, including many displaced scientists from central Europe, which included Germany, with assistance from the United Kingdom and Canada during World War II as part of the top-secret Manhattan Project. While the first weapons were developed primarily out of fear that Nazi Germany would develop them first, they were eventually used against the Japanese cities of Hiroshima and Nagasaki. The first test was conducted on July 16, 1945 at a site near Alamogordo, New Mexico. The Soviet Union developed and tested their first nuclear weapon in 1949, based partially on information obtained from Soviet espionage in the United States. Both the U.S. and USSR would go on to develop weapons powered by nuclear fusion (hydrogen bombs) by the mid-1950s. With the invention of reliable rocketry during the 1960s, it became possible for nuclear weapons to be delivered anywhere in the world on a very short notice, and the two Cold War superpowers adopted a strategy of deterrence to maintain a shaky peace.

U.S. and USSR/Russian nuclear weapons stockpiles, 1945-2005

Nuclear weapons were symbols of military and national power, and nuclear testing was often used both to test new designs as well as to send political messages. Other nations also developed nuclear weapons during this time, including the United Kingdom, France, and China. These five members of the "nuclear club" agreed to attempt to limit the spread of nuclear proliferation to other nations, though four other countries (India, South Africa, Pakistan, and Israel) developed or acquired nuclear arms during this time. At the end of the Cold War in the early 1990s, the Russian Federation inherited the weapons of the former USSR, and along with the U.S., pledged to reduce their stockpile for increased international safety. Nuclear proliferation has continued, though, with Pakistan testing their first weapons in 1998, and North Korea performing a test in 2006. In January 2005, Pakistani metallurgist Abdul Qadeer Khan confessed to selling nuclear technology and information of nuclear weapons to Iran, Libya, and North Korea in a massive, international proliferation ring. On October 9, 2006, North Korea claimed it had conducted an underground nuclear test, though the very small apparent yield of the blast has led many to conclude that it was not fully successful (see 2006 North Korean nuclear test). Additionally, since 9/11 increased attention has been given to the threat of nuclear terrorism, whereby non-state actors manage to develop, purchase, or steal nuclear arms and detonate them against civilians. Post-Cold War discussions of nuclear weapons have focused on the fact that the "rationality" of nuclear deterrence, credited with the lack of use of nuclear weapons during the Cold War, may not apply in a world with only one superpower, or a world where the nuclear actors are stateless.

There have been (at least) four major false alarms, the most recent in 1995, that almost resulted in the U.S. or USSR/Russia launching its weapons in retaliation for a supposed attack. Additionally, during the Cold War the U.S. and USSR came close to nuclear warfare several times, most notably during the Cuban Missile Crisis. As of 2006, there are estimated to be at least 27,000 nuclear weapons held by at least eight countries, 96 percent of them in the possession of the United States and Russia.

Nuclear weapons have been at the heart of many national and international political disputes and have played a major part in popular culture since their dramatic public debut in the 1940s and have usually symbolized the ultimate ability of mankind to utilize the strength of nature for destruction. Dozens of movies, books, television shows, plays, and other cultural productions have been made with nuclear weapons as either the explicit subject or an implied leitmotiv.

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Nuclear strategy

Main article: Nuclear warfare

The United States' Peacekeeper missile was a MIRVed delivery system. Each missile could contain up to ten nuclear warheads (shown in red), each of which could be aimed at a different target. These were developed to make missile defense very difficult for an enemy country

Nuclear warfare strategy is a way for either fighting or avoiding a nuclear war. The policy of trying to ward off a potential attack by a nuclear weapon from another country by threatening nuclear retaliation is known as the strategy of nuclear deterrence. The goal in deterrence is to always maintain a second strike status (the ability of a country to respond to a nuclear attack with one of its own) and potentially to strive for first strike status (the ability to completely destroy an enemy's nuclear forces before they could retaliate). During the Cold War, policy and military theorists in nuclear-enabled countries worked out models of what sorts of policies could prevent one from ever being attacked by a nuclear weapon.

Different forms of nuclear weapons delivery (see below) allow for different types of nuclear strategy, primarily by making it difficult to defend against them and difficult to launch a pre-emptive strike against them. Sometimes this has meant keeping the weapon locations hidden, such as putting them on submarines or train cars whose locations are very hard for an enemy to track, and other times this means burying them in hardened bunkers. Other responses have included attempts to make it seem likely that the country could survive a nuclear attack, by using missile defense (to destroy the missiles before they land) or by means of civil defense (using early warning systems to evacuate citizens to a safe area before an attack). Note that weapons which are designed to threaten large populations or to generally deter attacks are known as "strategic" weapons. Weapons which are designed to actually be used on a battlefield in military situations are known as "tactical" weapons.

There are critics of the very idea of "nuclear strategy" for waging nuclear war who have suggested that a nuclear war between two nuclear powers would result in mutual annihilation. From this point of view, the significance of nuclear weapons is purely to deter war because any nuclear war would immediately escalate out of mutual distrust and fear, resulting in mutually assured destruction. This threat of national, if not global, destruction has been a strong motivation for anti-nuclear weapons activism.

Critics from the peace movement and within the military establishment have questioned the usefulness of such weapons in the current military climate. The use of (or threat of use of) such weapons would generally be contrary to the rules of international law applicable in armed conflict, according to an advisory opinion issued by the International Court of Justice in 1996.

Perhaps the most controversial idea in nuclear strategy is that nuclear proliferation would be desirable. This view argues that, unlike conventional weapons, nuclear weapons successfully deter all-out war between states, as they did during the Cold War between the U.S. and the Soviet Union. Political scientist Kenneth Waltz is the most prominent advocate of this argument

Weapons delivery

Main article: Nuclear weapons delivery

The first nuclear weapons were gravity bombs, such as the "Fat Man" weapon dropped on Nagasaki, Japan. These weapons were very large and could only be delivered by a bomber aircraft

Nuclear weapons delivery—the technology and systems used to bring a nuclear weapon to its target—is an important aspect of nuclear weapons relating both to nuclear weapon design and nuclear strategy. Additionally, developing and maintaining delivery options is among the most resource-intensive aspects of nuclear weapons: according to one estimate, deployment of nuclear weapons accounted for 57% of the total financial resources spent by the United States in relation to nuclear weapons since 1940.

Historically the first method of delivery, and the method used in the two nuclear weapons actually used in warfare, is as a gravity bomb, dropped from bomber aircraft. This method is usually the first developed by countries as it does not place many restrictions on the size of the weapon, and weapon miniaturization is something which requires considerable weapons design knowledge. It does, however, limit the range of attack, the response time to an impending attack, and the number of weapons which can be fielded at any given time. Additionally, specialized delivery systems are usually not necessary; especially with the advent of miniaturization, nuclear bombs can be delivered by both strategic bombers and tactical fighter-bombers, allowing an air force to use its current fleet with little or no modification. This method may still be considered the primary means of nuclear weapons delivery; the majority of U.S. nuclear warheads, for example, are represented in free-fall gravity bombs, namely the B61.

More preferable from a strategic point of view are nuclear weapons mounted onto a missile, which can use a ballistic trajectory to deliver a warhead over the horizon. While even short range missiles allow for a faster and less vulnerable attack, the development of intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) has allowed some nations to plausibly deliver missiles anywhere on the globe with a high likelihood of success. More advanced systems, such as multiple independently targetable reentry vehicles (MIRVs) allow multiple warheads to be launched at several targets from any one missile, reducing the chance of any successful missile defense. Today, missiles are most common among systems designed for delivery of nuclear weapons. Making a warhead small enough to fit onto a missile, though, can be a difficult task.

Tactical weapons (see above) have involved the most variety of delivery types, including not only gravity bombs and missiles but also artillery shells, land mines, and nuclear depth charges and torpedoes for anti-submarine warfare. An atomic mortar was also tested at one time by the United States. Small, two-man portable tactical weapons (somewhat misleadingly referred to as suitcase bombs), such as the Special Atomic Demolition Munition, have been developed, although the difficulty to combine sufficient yield with portability limits their military utility.

Governance, control, and law

The International Atomic Energy Agency was created in 1957 in order to encourage the peaceful development of nuclear technology while providing international safeguards against nuclear proliferation

Because of the immense military power they can confer, the political control of nuclear weapons has been a key issue for as long as they have existed; in most countries the use of nuclear force can only be authorized by the head of government.

In the late 1940s, lack of mutual trust prohibited the United States and the Soviet Union from making ground towards international arms control agreements, but by the 1960s steps were being taken to limit both the proliferation of nuclear weapons to other countries and the environmental effects of nuclear testing. The Partial Test Ban Treaty (1963) restricted all nuclear testing to underground nuclear testing, to prevent contamination from nuclear fallout, while the Nuclear Non-Proliferation Treaty (1968) attempted to place restrictions on the types of activities which signatories could participate in, with the goal of allowing the transference of non-military nuclear technology to member countries without fear of proliferation. In 1957, the International Atomic Energy Agency (IAEA) was established under the mandate of the United Nations in order to encourage the development of the peaceful applications of nuclear technology, provide international safeguards against its misuse, and facilitate the application of safety measures in its use. In 1996, many nations signed and ratified the Comprehensive Test Ban Treaty which prohibits all testing of nuclear weapons, which would impose a significant hindrance to their development by any complying country.

Additional treaties have governed nuclear weapons stockpiles between individual countries, such as the SALT I and START I treaties, which limited the numbers and types of nuclear weapons between the United States and the Soviet Union.

Nuclear weapons have also been opposed by agreements between countries. Many nations have been declared Nuclear-Weapon-Free Zones, areas where nuclear weapons production and deployment are prohibited, through the use of treaties. The Treaty of Tlatelolco (1967) prohibited any production or deployment of nuclear weapons in Latin America and the Caribbean, and the Treaty of Pelindaba (1964) prohibits nuclear weapons in many African countries. As recently as 2006 a Central Asian Nuclear Weapon Free Zone was established amongst the former Soviet republics of Central Asia prohibiting nuclear weapons.

In 1996, the International Court of Justice, the highest court of the United Nations, issued an Advisory Opinion concerned with the "Legality of the Threat or Use of Nuclear Weapons". The court ruled that the use or threat of use of nuclear weapons would violate various articles of international law, including the Geneva Conventions, the Hague Conventions, the UN Charter, and the Universal Declaration of Human Rights.

See also

More technical details

• Nuclear weapon design
• Nuclear weapon yield
• Effects of nuclear explosions

History

• History of nuclear weapons
• Manhattan Project
• Los Alamos National Laboratory
• Lawrence Livermore National Laboratory
• Nuclear testing
  • Nevada Test Site
• Soviet atomic bomb project
• Stanislav Petrov
• German nuclear energy project
• Japanese atomic program
• Nuclear and radiation accidents (including nuclear weapons accidents)

Related technology and science

• Nuclear physics
• Nuclear fission
• Nuclear fusion
• Nuclear reactor
• Nuclear engineering

Military strategy

• Nuclear warfare
• Civil Defense
• Nuclear strategy
• Mutual Assured Destruction
• Fractional Orbital Bombardment System

Proliferation and politics

• Nuclear proliferation
• Nuclear Non-Proliferation Treaty
• Strategic Arms Limitation Talks
• Comprehensive Test Ban Treaty
• Nuclear disarmament
• Three Non-Nuclear Principles of Japan
• International Court of Justice advisory opinion on legality of nuclear weapons
• List of countries with nuclear weapons
• Nuclear weapons and the United States
• Nuclear weapons and the United Kingdom
• List of nuclear weapons

Popular culture

• Nuclear weapons in popular culture
• The Butter Battle Book

Aftermath

• Nuclear winter
• Nuclear summer

References

• Bethe, Hans Albrecht. The Road from Los Alamos. New York: Simon and Schuster, 1991. ISBN 0-671-74012-1
• DeVolpi, Alexander, Minkov, Vladimir E., Simonenko, Vadim A., and Stanford, George S. Nuclear Shadowboxing: Contemporary Threats from Cold War Weaponry. Fidlar Doubleday, 2004
• Glasstone, Samuel and Dolan, Philip J. The Effects of Nuclear Weapons (third edition). Washington, D.C.: U.S. Government Printing Office, 1977. Available online (PDF).
• NATO Handbook on the Medical Aspects of NBC Defensive Operations (Part I - Nuclear). Departments of the Army, Navy, and Air Force: Washington, D.C., 1996
• Hansen, Chuck. U.S. Nuclear Weapons: The Secret History. Arlington, TX: Aerofax, 1988
• Hansen, Chuck. The Swords of Armageddon: U.S. nuclear weapons development since 1945. Sunnyvale, CA: Chukelea Publications, 1995. [1]
• Holloway, David. Stalin and the Bomb. New Haven: Yale University Press, 1994. ISBN 0-300-06056-4
• The Manhattan Engineer District, "The Atomic Bombings of Hiroshima and Nagasaki" (1946)
• Smyth, Henry DeWolf. Atomic Energy for Military Purposes. Princeton, NJ: Princeton University Press, 1945. (Smyth Report – the first declassified report by the US government on nuclear weapons)
• The Effects of Nuclear War. Office of Technology Assessment, May 1979.
• Rhodes, Richard. Dark Sun: The Making of the Hydrogen Bomb. New York: Simon and Schuster, 1995. ISBN 0-684-82414-0
• Rhodes, Richard. The Making of the Atomic Bomb. New York: Simon and Schuster, 1986 ISBN 0-684-81378-5
• Weart, Spencer R. Nuclear Fear: A History of Images. Cambridge, MA: Harvard University Press, 1988.

External links

Current World Nuclear Arsenals

• Current World Nuclear Arsenals has estimates of nuclear arsenals in the respective countries.

General

• Nuclear Weapon Archive from Carey Sublette is a reliable source of information and has links to other sources and an informative FAQ.
• The Federation of American Scientists provide solid information on weapons of mass destruction, including nuclear weapons and their effects
• Alsos Digital Library for Nuclear Issues – contains many resources related to nuclear weapons, including a historical and technical overview and searchable bibliography of web and print resources.
• Everything you wanted to know about nuclear technology — Provided by New Scientist.
• Congressional Research Service (CRS) Reports regarding Nuclear weapons
• Video archive of US, Soviet, UK, Chinese and French Nuclear Weapon Testing at sonicbomb.com

Historical

• The Manhattan Project: Making the Atomic Bomb at AtomicArchive.com
• Los Alamos National Laboratory — History (U.S. nuclear history)
• Race for the Superbomb, PBS website on the history of the H-bomb
• U.S. nuclear test photographs from the DOE Nevada Site Office
• U.S. nuclear test film clips from the DOE Nevada Site Office

Effects

• Hans Bethe talking about his shock of seeing the after effects of Hiroshima on Peoples Archive.
• Nuclear weapon simulator for several major US cities, from Federation of American Scientists
• HYDESim: High-Yield Detonatonation Effects Simulator Another Nuclear weapon simulator with a few more features based on the "The Effects of Nuclear Weapons", 3rd Edition, by Samuel Glasstone and Philip J. Dolan.
• Fallout Calculator for various regions, from Federation of American Scientists
• Example scenarios – Two scenarios of a nuclear explosion on two United States cities, from AtomicArchive.com
• Effects of Nuclear weapons These tables describe the effects of various nuclear blast sizes. All figures are for 15 mph (24 km/h) winds. Thermal burns represent injuries to an unprotected person. The legend describes the data.
• Effects of nuclear weapons from AtomicArchive.com
• The Effects of Nuclear Weapons by Samuel Glasstone and Philip J. Dolan (1977 edn.) — an official text of the US government on weapons effects which is generally considered definitive

Issues

• "The Nuclear Weapons Debate" - OneWorld.net's Perspectives Magazine, May 2005
• "Nuclear Power and Nuclear Weapons: Making the Connections" – an article about the connections between nuclear power and nuclear weapons development by an anti-nuclear group.
• Nuclear War Survival Skills is a public domain text about civil defense.
• IPPNW: International Physicians for the Prevention of Nuclear War – Nobel Peace Prize-winning organization with information about the medical consequences of nuclear weapons, war and militarization.
• Bulletin of the Atomic Scientists – Magazine founded in 1945 by Manhattan Project scientists. Covers nuclear weapons proliferation and many other global security issues. See this page for comprehensive data on nuclear weapons worldwide.
• 50 Facts About U.S. Nuclear Weapons – Largest, smallest, number, cost, etc.
• Nuclear Files.org covers the history of nuclear weapons and explores the political, legal and ethical challenges of the Nuclear Age.
• Union of Concerned Scientists – Nuclear Policy, weapons, testing, technical issues, and arms control.
• Nuclear Ambitions - The World's Deadly Arsenal - Independent news on issues relating to nuclear weapons and disarmament by the news agency Inter Press Service