Nuclear Weapon 1 Nuclear Weapon

Home , B83 nuclear bomb, Pure fusion weapon

A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. The first fission ("atomic") bomb test released the same amount of energy as approximately 20,000 tons of TNT. The first thermonuclear ("hydrogen") bomb test released the same amount of energy as approximately 10,000,000 tons of TNT.[1]

A modern thermonuclear weapon weighing little more than 2,400 pounds ( kg) can produce an explosive force comparable to the detonation of more than 1.2 million tons (1.1 million tonnes) of TNT.[2] Thus, even a small nuclear device no larger than traditional bombs can devastate an entire city by blast, fire and radiation. Nuclear weapons are considered weapons of mass destruction, and their use and control have The mushroom cloud of the atomic bombing of Nagasaki, Japan on August 9, 1945 been a major focus of international relations rose some 18 kilometers ( mi) above the bomb's hypocenter. policy since their debut.

Only two nuclear weapons have been used in the course of warfare, both by the United States near the end of World War II. On 6 August 1945, a uranium gun-type fission bomb code-named "Little Boy" was detonated over the Japanese city of Hiroshima. Three days later, on 9 August, a plutonium implosion-type fission bomb code-named "Fat Man" was exploded over Nagasaki, Japan. These two bombings resulted in the deaths of approximately 200,000 people—mostly civilians—from acute injuries sustained from the explosions.[3] The role of the bombings in Japan's surrender, and their ethical status, remain the subject of scholarly and popular debate.

Since the bombings of Hiroshima and Nagasaki, nuclear weapons have been detonated on over two thousand occasions for testing purposes and demonstrations. Only a few nations possess such weapons or are suspected of seeking them. The only countries known to have detonated nuclear weapons—and that acknowledge possessing such weapons—are (chronologically by date of first test) the United States, the Soviet Union (succeeded as a nuclear power by Russia), the United Kingdom, France, the People's Republic of China, India, Pakistan, and North Korea. In addition, Israel is also widely believed to possess nuclear weapons, though it does not acknowledge having them.[4][5][6] One state, South Africa, fabricated nuclear weapons in the past, but as its apartheid regime was coming to an end it disassembled its arsenal, acceded to the NPT and accepted full-scope international safeguards.[7] The Federation of American Scientists estimates there are more than 17,000 nuclear warheads in the world as of 2012, with around 4,300 of them considered "operational", ready for use.[4] Nuclear weapon 2

Types

There are two basic types of nuclear weapons: those that derive the majority of their energy from nuclear fission reactions alone, and those that use fission reactions to begin nuclear fusion reactions that produce a large amount of the total energy output.

Fission weapons

All existing nuclear weapons derive some of their explosive energy from nuclear fission reactions. Weapons whose explosive output is exclusively from fission reactions are commonly referred to as atomic bombs or atom bombs (abbreviated as A-bombs). This has long been noted as something of a misnomer, as their energy comes from the nucleus of the atom.

In fission weapons, a mass of fissile material (enriched uranium or plutonium) is assembled into a supercritical mass—the amount of material needed to start an The two basic fission weapon designs exponentially growing nuclear chain reaction—either by shooting one piece of sub-critical material into another (the "gun" method) or by compressing a sub-critical sphere of material using chemical explosives to many times its original density (the "implosion" method). The latter approach is considered more sophisticated than the former and only the latter approach can be used if the fissile material is plutonium.

A major challenge in all nuclear weapon designs is to ensure that a significant fraction of the fuel is consumed before the weapon destroys itself. The amount of energy released by fission bombs can range from the equivalent of less than a ton of TNT upwards of 500,000 tons (500 kilotons) of TNT.[8] All fission reactions necessarily generate fission products, the radioactive remains of the atomic nuclei split by the fission reactions. Many fission products are either highly radioactive (but short-lived) or moderately radioactive (but long-lived), and as such are a serious form of radioactive contamination if not fully contained. Fission products are the principal radioactive component of nuclear fallout. The most commonly used fissile materials for nuclear weapons applications have been uranium-235 and plutonium-239. Less commonly used has been uranium-233. Neptunium-237 and a number of isotopes of americium may be usable for nuclear explosives as well, but it is not clear that this has ever been implemented, and even their plausible use in nuclear weapons is a matter of scientific dispute.[9] Nuclear weapon 3

Fusion weapons

The other basic type of nuclear weapon produces a large proportion of its energy in nuclear fusion reactions. Such fusion weapons are generally referred to as thermonuclear weapons or more colloquially as hydrogen bombs (abbreviated as H-bombs), as they rely on fusion reactions between isotopes of hydrogen (deuterium and tritium). All such weapons derive a significant portion, and sometimes a majority, of their energy from fission. This is because a fission weapon is required as a "trigger" for the fusion reactions, and the fusion reactions can themselves trigger additional fission reactions.[10]

Only six countries—United States, Russia, United Kingdom, People's Republic of China, France and India—have conducted thermonuclear weapon tests. (Whether India has detonated a "true", multi-staged thermonuclear weapon is controversial.)[11] All thermonuclear weapons are considered much more difficult to successfully design and execute than primitive fission weapons. Almost all of the nuclear weapons deployed today use the thermonuclear design because it is more efficient.

Thermonuclear bombs work by using the energy of a fission bomb to compress and heat fusion fuel. In the Teller-Ulam design, which

accounts for all multi-megaton yield hydrogen bombs, this is The basics of the Teller–Ulam design for a accomplished by placing a fission bomb and fusion fuel (tritium, hydrogen bomb: a fission bomb uses radiation to deuterium, or lithium deuteride) in proximity within a special, compress and heat a separate section of fusion fuel. radiation-reflecting container. When the fission bomb is detonated, gamma rays and X-rays emitted first compress the fusion fuel, then heat it to thermonuclear temperatures. The ensuing fusion reaction creates enormous numbers of high-speed neutrons, which can then induce fission in materials not normally prone to it, such as depleted uranium. Each of these components is known as a "stage", with the fission bomb as the "primary" and the fusion capsule as the "secondary". In large, megaton-range hydrogen bombs, about half of the yield comes from the final fissioning of depleted uranium.[8]

Virtually all thermonuclear weapons deployed today use the "two-stage" design described above, but it is possible to add additional fusion stages—each stage igniting a larger amount of fusion fuel in the next stage. This technique can result in thermonuclear weapons of arbitrarily large yield, in contrast to fission bombs, which are limited in their explosive force. The largest nuclear weapon ever detonated—the Tsar Bomba of the USSR, which released an energy equivalent of over 50 million tons (50 megatons) of TNT—was a three-stage weapon. Most thermonuclear weapons are considerably smaller than this, due to practical constraints from missile warhead space and weight requirements.[12] Fusion reactions do not create fission products, and thus contribute far less to the creation of nuclear fallout than fission reactions, but because all thermonuclear weapons contain at least one fission stage, and many high-yield thermonuclear devices have a final fission stage, thermonuclear weapons can generate at least as much nuclear fallout as fission-only weapons. Nuclear weapon 4

Other types There are other types of nuclear weapons as well. For example, a boosted fission weapon is a fission bomb that increases its explosive yield through a small amount of fusion reactions, but it is not a fusion bomb. In the boosted bomb, the neutrons produced by the fusion reactions serve primarily to increase the efficiency of the fission bomb. Some weapons are designed for special purposes; a neutron bomb is a thermonuclear weapon that yields a relatively small explosion but a relatively large amount of neutron radiation; such a device could theoretically be used to cause massive casualties while leaving infrastructure mostly intact and creating a minimal amount of fallout. The detonation of any nuclear weapon is accompanied by a blast of neutron radiation. Surrounding a nuclear weapon with suitable materials (such as cobalt or gold) creates a weapon known as a salted bomb. This device can produce exceptionally large quantities of radioactive contamination. Research has been done into the possibility of pure fusion bombs: nuclear weapons that consist of fusion reactions without requiring a fission bomb to initiate them. Such a device might provide a simpler path to thermonuclear weapons than one that required development of fission weapons first, and pure fusion weapons would create significantly less nuclear fallout than other thermonuclear weapons, since they would not disperse fission products. In 1998, the United States Department of Energy divulged that the United States had, "...made a substantial investment" in the past to develop pure fusion weapons, but that, "The U.S. does not have and is not developing a pure fusion weapon," and that, "No credible design for a pure fusion weapon resulted from the DOE investment."[13] Most variation in nuclear weapon design is for the purpose of achieving different yields for different situations, and in manipulating design elements to attempt to minimize weapon size.[8]

Weapons delivery

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, development and maintenance of delivery options is among the most resource-intensive aspects of a nuclear weapons program: according to one estimate, deployment costs accounted for 57% of the total financial resources spent by the United States in relation to nuclear weapons since 1940.[14] The first nuclear weapons were gravity bombs, Historically the first method of delivery, and the method used in the such as this "Fat Man" weapon dropped on two nuclear weapons used in warfare, was as a gravity bomb, dropped Nagasaki, Japan. They were very large and could from bomber aircraft. This is usually the first method that countries only be delivered by heavy bomber aircraft developed, as it does not place many restrictions on the size of the weapon and weapon miniaturization requires considerable weapons design knowledge. It does, however, limit attack range, response time to an impending attack, and the number of weapons that a country can field at the same time.

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 free-fall gravity bombs, namely the B61.[8] Nuclear weapon 5

More preferable from a strategic point of view is a nuclear weapon mounted onto a missile, which can use a ballistic trajectory to deliver the warhead over the horizon. While even short range missiles allow for a faster and less vulnerable attack, the development of long-range intercontinental ballistic missiles (ICBMs) and submarine-launched ballistic missiles (SLBMs) has given some nations the ability 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), can launch multiple warheads at different targets from one missile, reducing the chance of a successful missile defense. Today, missiles are most common among systems designed for delivery of nuclear weapons. Making a warhead small enough to fit [8] onto a missile, though, can be difficult. A Trident II SLBM launched from a Royal Navy Vanguard class ballistic missile submarine. Tactical weapons 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 of combining sufficient yield with portability limits their military utility.[8]

Nuclear strategy

Nuclear warfare strategy is a set of policies that deal with preventing or fighting a nuclear war. The policy of trying to prevent an 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 capability (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 The United States' Peacekeeper missile was a MIRVed delivery system. Each missile could attacked by a nuclear weapon. contain up to ten nuclear warheads (shown in Different forms of nuclear weapons delivery (see above) allow for red), each of which could be aimed at a different target. These were developed to make missile different types of nuclear strategies. The goals of any strategy are defense very difficult for an enemy country. generally to make it difficult for an enemy to launch a pre-emptive strike against the weapon system and difficult to defend against the delivery of the weapon during a potential conflict. Sometimes this has meant keeping the weapon locations hidden, such as deploying them on submarines or rail cars whose locations are very hard for an enemy to track and other times this means protecting them by burying them in hardened bunkers.

Other components of nuclear strategies have included using missile defense (to destroy the missiles before they land) or implementation of civil defense measures (using early-warning systems to evacuate citizens to safe areas before an attack). Nuclear weapon 6

Note that weapons designed to threaten large populations, or to generally deter attacks are known as strategic weapons. Weapons designed for use on a battlefield in military situations are called 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. According to an advisory opinion issued by the International Court of Justice in 1996, the use of (or threat of use of) such weapons would generally be contrary to the rules of international law applicable in armed conflict, but the court did not reach an opinion as to whether or not the threat or use would be lawful in specific extreme circumstances such as if the survival of the state were at stake. 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, and they are said to have done this during the Cold War between the U.S. and the Soviet Union.[15] Political scientist Kenneth Waltz is the most prominent advocate of this argument.[16][17] The threat of potentially suicidal terrorists possessing nuclear weapons (a form of nuclear terrorism) complicates the decision process. The prospect of mutually assured destruction may not deter an enemy who expects to die in the confrontation. Further, if the initial act is from a stateless terrorist instead of a sovereign nation, there is no fixed nation or fixed military targets to retaliate against. It has been argued, especially after the September 11, 2001 attacks, that this complication is the sign of the next age of nuclear strategy, distinct from the relative stability of the Cold War.[18] In 1996, the United States adopted a policy of allowing the targeting of its nuclear weapons at terrorists armed with weapons of mass destruction.[19]

Governance, control, and law

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 or head of state.[20] In the late 1940s, lack of mutual trust was preventing the United States and the Soviet Union from making ground towards international arms control agreements. The Russell–Einstein Manifesto was issued in London on July 9, 1955 by Bertrand Russell in the midst of the Cold The International Atomic Energy Agency was created in 1957 to encourage peaceful War. It highlighted the dangers posed by nuclear weapons and called development of nuclear technology while for world leaders to seek peaceful resolutions to international conflict. providing international safeguards against nuclear The signatories included eleven pre-eminent intellectuals and proliferation. scientists, including Albert Einstein, who signed it just days before his death on April 18, 1955. A few days after the release, philanthropist Cyrus S. Eaton offered to sponsor a conference—called for in the manifesto—in Pugwash, Nova Scotia, Eaton's birthplace. This conference was to be the first of the Pugwash Conferences on Science and World Affairs, held in July 1957.

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 signatories could participate in, with the goal Nuclear weapon 7

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 to encourage development of peaceful applications for nuclear technology, provide international safeguards against its misuse, and facilitate the application of safety measures in its use. In 1996, many nations signed the Comprehensive Test Ban Treaty,[21] which prohibits all testing of nuclear weapons. A testing ban imposes a significant hindrance to nuclear arms development by any complying country.[22] The Treaty requires the ratification by 44 specific states before it can go into force; as of 2012, the ratification of eight of these states is still required.[21] Additional treaties and agreements have governed nuclear weapons stockpiles between the countries with the two largest stockpiles, the United States and the Soviet Union, and later between the United States and Russia. These include treaties such as SALT II (never ratified), START I (expired), INF, START II (never ratified), SORT, and New START, as well as non-binding agreements such as SALT I and the Presidential Nuclear Initiatives[23] of 1991. Even when they did not enter into force, these agreements helped limit and later reduce the numbers and types of nuclear weapons between the United States and the Soviet Union/Russia. 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 the middle of 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. In view of the unique, destructive characteristics of nuclear weapons, the International Committee of the Red Cross calls on States to ensure that these weapons are never used, irrespective of whether they consider them lawful or not.[24] Additionally, there have been other, specific actions meant to discourage countries from developing nuclear arms. In the wake of the tests by India and Pakistan in 1998, economic sanctions were (temporarily) levied against both countries, though neither were signatories with the Nuclear Non-Proliferation Treaty. One of the stated casus belli for the initiation of the 2003 Iraq War was an accusation by the United States that Iraq was actively pursuing nuclear arms (though this was soon discovered not to be the case as the program had been discontinued). In 1981, Israel had bombed a nuclear reactor being constructed in Osirak, Iraq, in what it called an attempt to halt Iraq's previous nuclear arms ambitions; in 2007, Israel bombed another reactor being constructed in Syria. Nuclear weapon 8

Disarmament

Nuclear disarmament refers to both the act of reducing or eliminating nuclear weapons and to the end state of a nuclear-free world, in which nuclear weapons are completely eliminated. Beginning with the 1963 Partial Test Ban Treaty and continuing through the 1996 Comprehensive Test Ban Treaty, there have been many treaties to limit or reduce nuclear weapons testing and stockpiles. The 1968 Nuclear Non-Proliferation Treaty has as one of its explicit conditions that all signatories must "pursue negotiations in good faith" towards the long-term goal of "complete disarmament". The nuclear

weapon states have largely treated that aspect of the agreement as Ukrainian workers use equipment provided by the [25] "decorative" and without force. U.S. Defense Threat Reduction Agency to dismantle a Soviet-era missile silo. After the end Only one country—South Africa—has ever fully renounced nuclear of the Cold War, Ukraine and the other weapons they had independently developed. The former Soviet non-Russian, post-Soviet republics relinquished republics of Belarus, Kazakhstan, and Ukraine returned Soviet nuclear Soviet nuclear stockpiles to Russia. arms stationed in their countries to Russia after the collapse of the USSR. Proponents of nuclear disarmament say that it would lessen the probability of nuclear war occurring, especially accidentally. Critics of nuclear disarmament say that it would undermine the present nuclear peace and deterrence and would lead to increased global instability. Various American government officials, who were in office during the Cold War period, have recently been advocating the elimination of nuclear weapons. These officials include Henry Kissinger, George Shultz, Sam Nunn, and William Perry. In January 2010, Lawrence M. Krauss stated that "no issue carries more importance to the long-term health and security of humanity than the effort to reduce, and perhaps one day, rid the world of nuclear weapons".[26]

In the years after the end of the Cold War, there have been numerous campaigns to urge the abolition of nuclear weapons, such as that organized by the Global Zero movement, and the goal of a "world without nuclear weapons" was advocated by United States President Barack Obama in an April 2009 speech in Prague.[27] A CNN poll from April 2010 indicated that the American public was nearly evenly split on the issue.[28] Others have argued that nuclear weapons have made the world relatively safer, with peace through deterrence and through the stability–instability paradox, including in south Asia.[29][30] Professor Kenneth Waltz has argued that nuclear weapons have helped keep an uneasy peace, and further nuclear weapon proliferation might even help avoid the large scale conventional wars that were so common prior to their invention at the end of World War II.[31] In the July 2012 issue of Foreign Affairs Waltz took issue with the view of most U.S., European, and Israeli, commentators and policymakers that a nuclear-armed Iran would be unacceptable. Instead Waltz argues that it would probably be the best possible outcome, as it would restore stability to the Middle East by balancing Israel's regional monopoly on nuclear weapons.[32] Professor John Mueller of Ohio State University, the author of Atomic Obsession,[33] has also dismissed the need to interfere with Iran's nuclear program and expressed that arms control measures are counterproductive.[34] During a 2010 lecture at the University of Missouri, which was broadcast by C-Span, Dr. Mueller has also argued that the threat from nuclear weapons, by terrorists and governments alike, has been exaggerated, both in the popular media and by officials.[35] Nuclear weapon 9

United Nations

The UN Office for Disarmament Affairs (UNODA) is a department of the United Nations Secretariat established in January 1998 as part of the United Nations Secretary-General Kofi Annan's plan to reform the UN as presented in his report to the General Assembly in July 1997.[36] Its goal is to promote nuclear disarmament and non-proliferation and the strengthening of the disarmament regimes in respect to other weapons of mass destruction, chemical and biological weapons. It also promotes disarmament efforts in the area of conventional weapons, especially land mines and small arms, which are often the weapons of choice in contemporary conflicts.

Following the retirement of Sergio Duarte in February 2012, Angela Kane was appointed as the new High Representative for Disarmament Affairs.

Angela Kane at a ceremony marking the anniversary of the Hiroshima and Nagasaki atomic bombings in 2012

Controversy

Even before the first nuclear weapons had been developed, scientists involved with the Manhattan Project were divided over the use of the weapon. The role of the two atomic bombings of the country in Japan's surrender and the U.S.'s ethical justification for them has been the subject of scholarly and popular debate for decades. The question of whether nations should have nuclear weapons, or test them, has been continually and nearly universally controversial. Demonstration against nuclear testing in Lyon, France, in the 1980s. Radioactive fallout from nuclear weapons testing was first drawn to public attention in 1954 when the Castle Bravo hydrogen bomb test at the Pacific Proving Grounds contaminated the crew and catch of the Japanese fishing boat Lucky Dragon.[37] One of the fishermen died in Japan seven months later, and the fear of contaminated tuna led to a temporary boycotting of the popular staple in Japan. The incident caused widespread concern around the world, especially regarding the effects of nuclear fallout and atmospheric nuclear testing, and "provided a decisive impetus for the emergence of the anti-nuclear weapons movement in many countries".[37]

Peace movements emerged in Japan and in 1954 they converged to form a unified "Japanese Council Against Atomic and Hydrogen Bombs". Japanese opposition to nuclear weapons tests in the Pacific Ocean was widespread, and "an estimated 35 million signatures were collected on petitions calling for bans on nuclear weapons".[38] In the United Kingdom, the first Aldermaston March organised by the Campaign for Nuclear Disarmament took place at Easter 1958, when several thousand people marched for four days from Trafalgar Square, London, to the Atomic Weapons Research Establishment close to Aldermaston in Berkshire, England, to demonstrate their opposition to nuclear weapons.[39][40] The Aldermaston marches continued into the late 1960s when tens of thousands of people took part in the four-day marches.[38] In 1959, a letter in the Bulletin of Atomic Scientists was the start of a successful campaign to stop the Atomic Energy Commission dumping radioactive waste in the sea 19 kilometres from Boston.[41] In 1962, Linus Pauling won the Nuclear weapon 10

Nobel Peace Prize for his work to stop the atmospheric testing of nuclear weapons, and the "Ban the Bomb" movement spread.[42] In 1963, many countries ratified the Partial Test Ban Treaty prohibiting atmospheric nuclear testing. Radioactive fallout became less of an issue and the anti-nuclear weapons movement went into decline for some years.[37][43] A resurgence of interest occurred amid European and American fears of nuclear war in the 1980s.[44] Between 1940 and 1996, the U.S. spent at least $8.63 trillion in present day terms[45] on nuclear weapons development. Over half was spent on building delivery mechanisms for the weapon. $541 billion in present day terms was spent on nuclear waste management and environmental remediation.[46]

Non-weapons uses

Apart from their use as weapons, nuclear explosives have been tested and used for various non-military uses, and proposed, but not used for large-scale earth moving. When long term health and clean-up costs were included, there was no economic advantage over conventional explosives.[47] 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 thermonuclear bomb test. In 2008 the worldwide presence of new isotopes from atmospheric testing beginning in the 1950s was developed into a The 1962 Sedan nuclear test formed a crater 100 m (330 ft) deep with a diameter of about 390 m reliable way of detecting art forgeries, as all paintings created after that (1,300 ft), as a means of investigating the period may contain traces of cesium-137 and strontium-90, isotopes possibilities of using peaceful nuclear explosions [48] that did not exist in nature before 1945. for large-scale earth moving.

Nuclear explosives have also been seriously studied as potential propulsion mechanisms for space travel (see Project Orion) and for asteroid deflection.

References

Notes [1] See Trinity (nuclear test) and Ivy Mike. [2] Specifically the US B83 nuclear bomb, with a yield of up to 1.2 Megatons.

[3] "Frequently Asked Questions #1" (http:/ / www. rerf. or. jp/ general/ qa_e/ qa1. html). Radiation Effects Research Foundation. . Retrieved Sept. 18, 2007. "total number of deaths is not known precisely ... acute (within two to four months) deaths ... Hiroshima ... 90,000－166,000 ... Nagasaki ... 60,000－80,000"

[4] "Federation of American Scientists: Status of World Nuclear Forces" (http:/ / www. fas. org/ programs/ ssp/ nukes/ nuclearweapons/

nukestatus. html). Fas.org. . Retrieved 2012-12-29.

[5] "Nuclear Weapons – Israel" (http:/ / www. fas. org/ nuke/ guide/ israel/ nuke/ index. html). Fas.org. Jan 8, 2007. . Retrieved 2010-12-15. [6] See also Mordechai Vanunu

[7] "Nuclear Weapons – South Africa" (http:/ / www. fas. org/ nuke/ guide/ rsa/ nuke/ index. html). Fas.org. May 29, 2000. . Retrieved 2011-04-07. [8] The best overall printed sources on nuclear weapons design are: Hansen, Chuck. U.S. Nuclear Weapons: The Secret History. San Antonio, TX: Aerofax, 1988; and the more-updated Hansen, Chuck. Swords of Armageddon: U.S. Nuclear Weapons Development since 1945. Sunnyvale, CA: Chukelea Publications, 1995.

[9] David Albright and Kimberly Kramer (2005-08-22). "Neptunium 237 and Americium: World Inventories and Proliferation Concerns" (http:/ /

isis-online. org/ uploads/ isis-reports/ documents/ np_237_and_americium. pdf). Institute for Science and International Security. . Retrieved 2011-10-13.

[10] Carey Sublette, Nuclear Weapons Frequently Asked Questions: 4.5.2 "Dirty" and "Clean" Weapons (http:/ / nuclearweaponarchive. org/

Nwfaq/ Nfaq4-5. html#Nfaq4. 5. 2), accessed 10 May 2011. Nuclear weapon 11

[11] On India's alleged hydrogen bomb test, see Carey Sublette, What Are the Real Yields of India's Test? (http:/ / nuclearweaponarchive. org/

India/ IndiaRealYields. html).

[12] Sublette, Carey. "The Nuclear Weapon Archive" (http:/ / nuclearweaponarchive. org/ ). . Retrieved 2007-03-07.

[13] U.S. Department of Energy, Restricted Data Declassification Decisions, 1946 to the Present (RDD-8) (http:/ / www. fas. org/ sgp/ othergov/

doe/ rdd-8. pdf) (January 1, 2002), accessed November 20, 2011. [14] Stephen I. Schwartz, ed., Atomic Audit: The Costs and Consequences of U.S. Nuclear Weapons Since 1940. Washington, D.C.: Brookings

Institution Press, 1998. See also Estimated Minimum Incurred Costs of U.S. Nuclear Weapons Programs, 1940–1996 (http:/ / www. brook.

edu/ fp/ projects/ nucwcost/ figure1. htm), an excerpt from the book. [15] Creveld, Martin Van (2000). "Technology and War II:Postmodern War?". In Charles Townshend. The Oxford History of Modern War. New York, USA: Oxford University Press. pp. 349. ISBN 0-19-285373-2. [16] Kenneth Waltz, "More May Be Better," in Scott Sagan and Kenneth Waltz, eds., The Spread of Nuclear Weapons (New York: Norton, 1995).

[17] Kenneth Waltz, "The Spread of Nuclear Weapons: More May Better," (http:/ / www. mtholyoke. edu/ acad/ intrel/ waltz1. htm) Adelphi Papers, no. 171 (London: International Institute for Strategic Studies, 1981).

[18] See, for example: Feldman, Noah. " Islam, Terror and the Second Nuclear Age (http:/ / www. nytimes. com/ 2006/ 10/ 29/ magazine/

29islam. html)," New York Times Magazine (29 October 2006).

[19] Daniel Plesch & Stephen Young, "Senseless policy", Bulletin of the Atomic Scientists (http:/ / books. google. com/

books?id=sgsAAAAAMBAJ& printsec=frontcover#v=onepage& q& f=false), November/December 1998, page 4. Fetched from URL on 18 April 2011. [20] In the United States, the President and the Secretary of Defense, acting as the National Command Authority, must jointly authorize the use of nuclear weapons. [21] Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (2010). " Status of Signature and Ratification (http:/

/ www. ctbto. org/ the-treaty/ status-of-signature-and-ratification)". Accessed 27 May 2010. Of the "Annex 2" states whose ratification of the CTBT is required before it enters into force, China, Egypt, Iran, Israel, and the United States have signed but not ratified the Treaty. India, North Korea, and Pakistan have not signed the Treaty. [22] Richelson, Jeffrey. Spying on the bomb: American nuclear intelligence from Nazi Germany to Iran and North Korea. New York: Norton, 2006.

[23] The Presidential Nuclear Initiatives (PNIs) on Tactical Nuclear Weapons At a Glance (http:/ / www. armscontrol. org/ factsheets/ pniglance), Fact Sheet, Arms Control Association.

[24] Nuclear weapons and international humanitarian law (http:/ / www. icrc. org/ web/ eng/ siteeng0. nsf/ htmlall/ section_ihl_nuclear_weapons) International Committee of the Red Cross

[25] Gusterson, Hugh, " Finding Article VI (http:/ / www. thebulletin. org/ web-edition/ columnists/ hugh-gusterson/ finding-article-vi)" Bulletin of the Atomic Scientists (8 January 2007). [26] Lawrence M. Krauss. The Doomsday Clock Still Ticks, Scientific American, January 2010, p. 26.

[27] Obama Prague Speech On Nuclear Weapons (http:/ / www. huffingtonpost. com/ 2009/ 04/ 05/ obama-prague-speech-on-nu_n_183219. html)

[28] CNN Poll: Public divided on eliminating all nuclear weapons (http:/ / politicalticker. blogs. cnn. com/ 2010/ 04/ 12/

cnn-poll-public-divided-on-eliminating-all-nuclear-weapons/ )

[29] http:/ / www. stimson. org/ images/ uploads/ research-pdfs/ ESCCONTROLCHAPTER1. pdf

[30] http:/ / krepon. armscontrolwonk. com/ archive/ 2911/ the-stability-instability-paradox

[31] https:/ / www. mtholyoke. edu/ acad/ intrel/ waltz1. htm Kenneth Waltz, “The Spread of Nuclear Weapons: More May be Better,”

[32] Waltz, Kenneth (July/August 2012). "Why Iran Should Get the Bomb: Nuclear Balancing Would Mean Stability" (http:/ / www.

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[33] http:/ / www. oup. com/ us/ catalog/ general/ subject/ Politics/ InternationalStudies/ InternationalSecurityStrategicSt/ ?view=usa& ci=9780195381368

[34] http:/ / bloggingheads. tv/ videos/ 2333 From 19:00 to 26:00 minutes

[35] http:/ / www. c-spanvideo. org/ program/ AtomicO: John Mueller, "Atomic Obsession"

[36] Renewing the United Nations: A Program for Reform (A/51/950) (http:/ / daccess-dds-ny. un. org/ doc/ UNDOC/ GEN/ N97/ 189/ 79/ IMG/

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[45] Staff. Consumer Price Index (estimate) 1800–2012 (http:/ / www. minneapolisfed. org/ community_education/ teacher/ calc/ hist1800. cfm). Federal Reserve Bank of Minneapolis. Retrieved February 22, 2012.

[46] Brookings Institution, "Estimated Minimum Incurred Costs of U.S. Nuclear Weapons Programs, 1940-1996", at http:/ / www. brook. edu/

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External links

• Current World Nuclear Arsenals (http:/ / www. cdi. org/ nuclear/ database/ nukestab. html) has estimates of nuclear arsenals in the respective countries.

General

• Nuclear Weapon Archive from Carey Sublette (http:/ / nuclearweaponarchive. org/ ) is a reliable source of

information and has links to other sources and an informative FAQ (http:/ / nuclearweaponarchive. org/ Nwfaq/

Nfaq0. html).

• The Federation of American Scientists (http:/ / fas. org) provide solid information on weapons of mass

destruction, including nuclear weapons (http:/ / fas. org/ nuke/ ) and their effects (http:/ / www. fas. org/ nuke/

intro/ nuke/ effects. htm)

• Alsos Digital Library for Nuclear Issues (http:/ / alsos. wlu. edu/ )—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 (http:/ / www. newscientist. com/ channel/ mech-tech/ nuclear)—Provided by New Scientist.

• Congressional Research Service (CRS) Reports regarding Nuclear weapons (http:/ / digital. library. unt. edu/

govdocs/ crs/ search. tkl?q=nuclear+ weapons& search_crit=title& search=Search& date1=Anytime&

date2=Anytime& type=form)

• Video archive of US, Soviet, UK, Chinese and French Nuclear Weapon Testing (http:/ / sonicbomb. com/

modules. php?name=Content& pa=showpage& pid=39) at sonicbomb.com (http:/ / www. sonicbomb. com)

• The National Museum of Nuclear Science & History (United States) (http:/ / www. nuclearmuseum. org/ )—located in Albuquerque, New Mexico; a Smithsonian Affiliate Museum

• Nuclear Emergency and Radiation Resources (http:/ / www. ibiblio. org/ rcip/ nuclear. html)

Historical

• The Manhattan Project: Making the Atomic Bomb (http:/ / www. atomicarchive. com/ History/ mp/ index. shtml) at AtomicArchive.com

• Los Alamos National Laboratory: History (http:/ / www. lanl. gov/ history/ ) (U.S. nuclear history)

• Race for the Superbomb (http:/ / www. pbs. org/ wgbh/ amex/ bomb/ ), PBS website on the history of the H-bomb

• U.S. nuclear test photographs (http:/ / www. nv. doe. gov/ library/ photos/ default. htm) from the DOE Nevada Site Office

• U.S. nuclear test film clips (http:/ / www. nv. doe. gov/ library/ films/ default. htm) from the DOE Nevada Site Office

• Recordings of recollections of the victims of Hiroshima and Nagasaki (http:/ / www. voshn. com)

• The Woodrow Wilson Center's Nuclear Proliferation International History Project (http:/ / www. wilsoncenter.

org/ program/ NPIHP/ ) or NPIHP is a global network of individuals and institutions engaged in the study of international nuclear history through archival documents, oral history interviews and other empirical sources. Article Sources and Contributors 14 Article Sources and Contributors

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