A nuclear weapon
(also called an atom bomb, nuke, atomic bomb, nuclear warhead, A-bomb,
or nuclear bomb
) is an explosive device that derives its destructive force from nuclear reactions
, either fission
(fission bomb) or from a combination of fission and fusion
reactions (thermonuclear bomb
). Both bomb types release large quantities of energy from relatively small amounts of matter.
The first test
of a fission ("atomic") bomb released an amount of energy approximately equal to 20,000 tons of TNT
The first thermonuclear ("hydrogen") bomb test
released energy approximately equal to 10 million tons of TNT (42 PJ). Nuclear bombs have had yields
between 10 tons TNT (the W54
) and 50 megatons for the Tsar Bomba
(see TNT equivalent
). A thermonuclear weapon weighing little more than 2,400 pounds (1,100 kg) can release energy equal to more than 1.2 million tons of TNT (5.0 PJ).
Testing and deployment of nuclear weapons
Since the atomic bombings of Hiroshima and Nagasaki
, nuclear weapons have been detonated over 2,000 times for testing
and demonstration. Only a few nations
possess such weapons or are suspected of seeking them. The only countries known to have detonated nuclear weapons—and acknowledge possessing them—are (chronologically by date of first test) the United States
, the Soviet Union
(succeeded as a nuclear power by Russia
), the United Kingdom
, and North Korea
is believed to possess nuclear weapons, though, in a policy of deliberate ambiguity
, it does not acknowledge having them. Germany
and the Netherlands
are nuclear weapons sharing
states. South Africa
is the only country to have independently developed
and then renounced and dismantled
its nuclear weapons.
The Trinity test
of the Manhattan Project
was the first detonation of a nuclear weapon, which led J. Robert Oppenheimer
to recall verses from the Hindu
scripture Bhagavad Gita
: "If the radiance of a thousand suns were to burst at once into the sky, that would be like the splendor of the mighty one "... "I am become Death, the destroyer of worlds".
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.
The two basic fission
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, just as it does with fusion weapons.
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 just under a ton to upwards of 500,000 tons (500 kilotons
) of TNT
(4.2 to 2.1×
All fission reactions generate fission products
, the remains of the split atomic nuclei. Many fission products are either highly radioactive
(but short-lived) or moderately radioactive (but long-lived), and as such, they are a serious form of radioactive contamination
. Fission products are the principal radioactive component of nuclear fallout
. Another source of radioactivity is the burst of free neutrons produced by the weapon. When they collide with other nuclei in the surrounding material, the neutrons transmute those nuclei into other isotopes, altering their stability and making them radioactive.
The most commonly used fissile materials for nuclear weapons applications have been uranium-235
. Less commonly used has been uranium-233
and some isotopes of americium
may be usable for nuclear explosives as well, but it is not clear that this has ever been implemented, and their plausible use in nuclear weapons is a matter of dispute.
The basics of the Teller–Ulam design
for a hydrogen bomb: a fission bomb uses radiation to compress and heat a separate section of fusion fuel.
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
). All such weapons derive a significant portion of their energy from fission reactions used to "trigger" fusion reactions, and fusion reactions can themselves trigger additional fission reactions.
Only six countries—United States
, United Kingdom, China, France, and India
—have conducted thermonuclear weapon tests. Whether India has detonated a "true" multi-staged thermonuclear weapon
is controversial. North Korea
claims to have tested a fusion weapon as of January 2016, though this claim is disputed.
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 accomplished by placing a fission bomb and fusion fuel (tritium
, or lithium deuteride
) in proximity within a special, radiation-reflecting container. When the fission bomb is detonated, gamma 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.
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 be used to construct 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 megatons of TNT (210 PJ), was a three-stage weapon. Most thermonuclear weapons are considerably smaller than this, due to practical constraints from missile warhead space and weight requirements.
, often referred to as the "father of the hydrogen bomb"
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.
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 number 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. There are two types of boosted fission bomb: internally boosted, in which a deuterium-tritium mixture is injected into the bomb core, and externally boosted, in which concentric shells of lithium-deuteride and depleted uranium are layered on the outside of the fission bomb core.
Some nuclear 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
) creates a weapon known as a salted bomb
. This device can produce exceptionally large quantities of long-lived radioactive contamination
. It has been conjectured that such a device could serve as a "doomsday weapon" because such a large quantity of radioactivities with half-lives of decades, lifted into the stratosphere where winds would distribute it around the globe, would make all life on the planet extinct.
In connection with the Strategic Defense Initiative
, research into the nuclear pumped laser
was conducted under the DOD program Project Excalibur
but this did not result in a working weapon. The concept involves the tapping of the energy of an exploding nuclear bomb to power a single-shot laser that is directed at a distant target.
During the Starfish Prime
high-altitude nuclear test in 1962, an unexpected effect was produced which is called a nuclear electromagnetic pulse
. This is an intense flash of electromagnetic energy produced by a rain of high-energy electrons which in turn are produced by a nuclear bomb's gamma rays. This flash of energy can permanently destroy or disrupt electronic equipment if insufficiently shielded. It has been proposed to use this effect to disable an enemy's military and civilian infrastructure as an adjunct to other nuclear or conventional military operations against that enemy. Because the effect is produced by high altitude nuclear detonations, it can produce damage to electronics over a wide, even continental, geographical area.
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 the development of fission weapons first, and pure fusion weapons would create significantly less nuclear fallout than other thermonuclear weapons because 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".
, which consists of particles
resembling ordinary matter
particles in most of their properties but having opposite electric charge
, has been considered as a trigger mechanism for nuclear weapons.
A major obstacle is the difficulty of producing antimatter in large enough quantities, and there is no evidence that it is feasible beyond the military domain.
However, the U.S. Air Force funded studies of the physics of antimatter in the Cold War
, and began considering its possible use in weapons, not just as a trigger, but as the explosive itself.
A fourth generation nuclear weapon design
is related to, and relies upon, the same principle as antimatter-catalyzed nuclear pulse propulsion
The system used to deliver
a nuclear weapon to its target is an important factor affecting both nuclear weapon design
and nuclear strategy
. The design, development, and maintenance of delivery systems are among the most expensive parts of a nuclear weapons program; they account, for example, for 57% of the financial resources spent by the United States on nuclear weapons projects since 1940.
The simplest method for delivering a nuclear weapon is a gravity bomb
dropped from aircraft
; this was the method used by the United States against Japan. This method places few restrictions on the size of the weapon. 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 miniaturization, nuclear bombs can be delivered by both strategic bombers
and tactical fighter-bombers
. This method is the primary means of nuclear weapons delivery; the majority of U.S. nuclear warheads, for example, are free-fall gravity bombs, namely the B61
Preferable from a strategic point of view is a nuclear weapon mounted on a missile
, which can use a ballistic
trajectory to deliver the warhead over the horizon. Although 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 onto a missile, though, can be difficult.
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 destroy an enemy's nuclear forces before they could retaliate). During the Cold War, policy and military theorists considered the sorts of policies that might prevent a nuclear attack, and they developed game theory
models that could lead to stable deterrence conditions.
Different forms of nuclear weapons delivery
(see above) allow for different types of nuclear strategies. The goals of any strategy are 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. This can mean keeping weapon locations hidden, such as deploying them on submarines
or land mobile transporter erector launchers
whose locations are difficult to track, or it can mean protecting weapons by burying them in hardened missile silo
bunkers. Other components of nuclear strategies included using missile defenses to destroy the missiles before they land, or implementing civil defense
measures using early-warning systems to evacuate citizens to safe areas before an attack.
Critics of nuclear war strategy often suggest that a nuclear war between two nations would result in mutual annihilation. From this point of view, the significance of nuclear weapons is to deter war because any nuclear war would 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.
position is that nuclear proliferation
can be desirable. In this case, it is argued that, unlike conventional weapons, nuclear weapons deter all-out war between states, and they succeeded in doing this during the Cold War
between the U.S. and the Soviet Union
In the late 1950s and early 1960s, Gen. Pierre Marie Gallois
of France, an adviser to Charles de Gaulle
, argued in books like The Balance of Terror: Strategy for the Nuclear Age
(1961) that mere possession of a nuclear arsenal was enough to ensure deterrence, and thus concluded that the spread of nuclear weapons could increase international stability
. Some prominent neo-realist
scholars, such as Kenneth Waltz
and John Mearsheimer
, have argued, along the lines of Gallois, that some forms of nuclear proliferation would decrease the likelihood of total war
, especially in troubled regions of the world where there exists a single nuclear-weapon state. Aside from the public opinion that opposes proliferation in any form, there are two schools of thought on the matter: those, like Mearsheimer, who favored selective proliferation,
and Waltz, who was somewhat more non-interventionist
Interest in proliferation and the stability-instability paradox
that it generates continues to this day, with ongoing debate about indigenous Japanese and South Korean
nuclear deterrent against North Korea
The threat of potentially suicidal terrorists possessing nuclear weapons (a form of nuclear terrorism
) complicates the decision process. The prospect of mutually assured destruction
might 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 might not be a nation or specific target to retaliate against. It has been argued, especially after the September 11, 2001, attacks
, that this complication calls for a new nuclear strategy, one that is distinct from that which gave relative stability during the Cold War.
Since 1996, the United States has had a policy of allowing the targeting of its nuclear weapons at terrorists armed with weapons of mass destruction
argues that although traditional deterrence is not an effective approach toward terrorist groups bent on causing a nuclear catastrophe, Gallucci believes that "the United States should instead consider a policy of expanded deterrence, which focuses not solely on the would-be nuclear terrorists but on those states that may deliberately transfer or inadvertently leak nuclear weapons and materials to them. By threatening retaliation against those states, the United States may be able to deter that which it cannot physically prevent.".
makes a similar case, arguing that the key to expanded deterrence is coming up with ways of tracing nuclear material to the country that forged the fissile material. "After a nuclear bomb detonates, nuclear forensics
cops would collect debris samples and send them to a laboratory for radiological analysis. By identifying unique attributes of the fissile material, including its impurities and contaminants, one could trace the path back to its origin."
The process is analogous to identifying a criminal by fingerprints. "The goal would be twofold: first, to deter leaders of nuclear states from selling weapons to terrorists by holding them accountable for any use of their weapons; second, to give leaders every incentive to tightly secure their nuclear weapons and materials."
According to the Pentagon's June 2019 "Doctrine for Joint Nuclear Operations
" of the Joint Chiefs of Staffs website Publication, "Integration of nuclear weapons employment with conventional and special operations forces is essential to the success of any mission or operation."
Governance, control, and law
The International Atomic Energy Agency
was created in 1957 to encourage peaceful development of nuclear technology while providing international safeguards against nuclear proliferation.
Because they are weapons of mass destruction, the proliferation and possible use of nuclear weapons are important issues in international relations and diplomacy. In most countries, the use of nuclear force can only be authorized by the head of government
or head of state
Despite controls and regulations governing nuclear weapons, there is an inherent danger of "accidents, mistakes, false alarms, blackmail, theft, and sabotage".
In the late 1940s, lack of mutual trust prevented the United States and the Soviet Union from making progress on arms control agreements. The Russell–Einstein Manifesto
was issued in London
on July 9, 1955, by Bertrand Russell
in the midst of the Cold War. It highlighted the dangers posed by nuclear weapons and called for world leaders to seek peaceful resolutions to international conflict. The signatories included eleven pre-eminent intellectuals and 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.
In 1957, the International Atomic Energy Agency
(IAEA) was established under the mandate of the United Nations
to encourage development of 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 the Comprehensive Nuclear-Test-Ban Treaty
which prohibits all testing of nuclear weapons. A testing ban imposes a significant hindrance to nuclear arms development by any complying country.
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.
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
, START II
(never ratified), SORT
, and New START
, as well as non-binding agreements such as SALT I
and the Presidential Nuclear Initiatives
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.
Large stockpile with global range (dark blue), smaller stockpile with global range (medium blue), small stockpile with regional range (light blue).
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
. Given 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.
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
, in what it called an attempt to halt Iraq's previous nuclear arms ambitions; in 2007, Israel bombed another reactor
being constructed in Syria
In 2013, Mark Diesendorf
said that governments of France, India, North Korea, Pakistan, UK, and South Africa have used nuclear power and/or research reactors to assist nuclear weapons development or to contribute to their supplies of nuclear explosives from military reactors.
The two tied-for-lowest points for the Doomsday Clock
have been in 1953, when the Clock was set to two minutes until midnight after the U.S. and the Soviet Union began testing hydrogen bombs, and in 2018, following the failure of world leaders to address tensions relating to nuclear weapons and climate change issues.
and United States nuclear weapon stockpiles throughout the Cold War
until 2015, with a precipitous drop in total numbers following the end of the Cold War in 1991.
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 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 "decorative" and without force.
Only one country—South Africa—has ever fully renounced nuclear weapons they had independently developed. The former Soviet republics of Belarus
, and Ukraine
returned Soviet nuclear 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, 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 elder statesmen,
who were in office during the Cold War
period, have 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".
workers use equipment provided by the U.S. Defense Threat Reduction Agency
to dismantle a Soviet-era missile silo. After the end of the Cold War, Ukraine and the other non-Russian, post-Soviet republics relinquished Soviet nuclear stockpiles to Russia.
In January 1986, Soviet leader Mikhail Gorbachev
publicly proposed a three-stage program for abolishing the world's nuclear weapons by the end of the 20th century.
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
poll from April 2010 indicated that the American public was nearly evenly split on the issue.
Some analysts 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. 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 before their invention at the end of World War II
But former Secretary Henry Kissinger
says there is a new danger, which cannot be addressed by deterrence: "The classical notion of deterrence was that there was some consequences before which aggressors and evildoers would recoil. In a world of suicide bombers, that calculation doesn’t operate in any comparable way". George Shultz
has said, "If you think of the people who are doing suicide attacks, and people like that get a nuclear weapon, they are almost by definition not deterrable".
As of early 2019, more than 90% of world's 13,865 nuclear weapons were owned by Russia and the United States.
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.
Notable nuclear weapons accidents
- August 21, 1945: While conducting impromptu experiments on a third core (an alloy of plutonium and gallium) which had been prepared for atomic warfare at Los Alamos National Laboratory, physicist Harry Daghlian received a lethal dose of radiation. He died on September 15, 1945.
- May 21, 1946: While conducting further impromptu experiments on the third plutonium core at Los Alamos National Laboratory, physicist Louis Slotin received a lethal dose of radiation. He died on May 30, 1946. After these 2 incidents, the core was used to construct a bomb for use on the Nevada Test Range.
- February 13, 1950: a Convair B-36B crashed in northern British Columbia after jettisoning a Mark IV atomic bomb. This was the first such nuclear weapon loss in history. The accident was designated a "Broken Arrow"—an accident involving a nuclear weapon but which does not present a risk of war. Experts believe that up to 50 nuclear weapons were lost during the Cold War.
- May 22, 1957: a 42,000-pound (19,000 kg) Mark-17 hydrogen bomb accidentally fell from a bomber near Albuquerque, New Mexico. The detonation of the device's conventional explosives destroyed it on impact and formed a crater 25 feet (7.6 m) in diameter on land owned by the University of New Mexico. According to a researcher at the Natural Resources Defense Council, it was one of the most powerful bombs made to date.
- June 7, 1960: the 1960 Fort Dix IM-99 accident destroyed a Boeing CIM-10 Bomarc nuclear missile and shelter and contaminated the BOMARC Missile Accident Site in New Jersey.
- January 24, 1961: the 1961 Goldsboro B-52 crash occurred near Goldsboro, North Carolina. A Boeing B-52 Stratofortress carrying two Mark 39 nuclear bombs broke up in mid-air, dropping its nuclear payload in the process.
- 1965 Philippine Sea A-4 crash, where a Skyhawk attack aircraft with a nuclear weapon fell into the sea. The pilot, the aircraft, and the B43 nuclear bomb were never recovered. It was not until 1989 that the Pentagon revealed the loss of the one-megaton bomb.
- January 17, 1966: the 1966 Palomares B-52 crash occurred when a B-52G bomber of the USAF collided with a KC-135 tanker during mid-air refuelling off the coast of Spain. The KC-135 was completely destroyed when its fuel load ignited, killing all four crew members. The B-52G broke apart, killing three of the seven crew members aboard. Of the four Mk28 type hydrogen bombs the B-52G carried, three were found on land near Almería, Spain. The non-nuclear explosives in two of the weapons detonated upon impact with the ground, resulting in the contamination of a 2-square-kilometer (490-acre) (0.78 square mile) area by radioactive plutonium. The fourth, which fell into the Mediterranean Sea, was recovered intact after a 2½-month-long search.
- January 21, 1968: the 1968 Thule Air Base B-52 crash involved a United States Air Force (USAF) B-52 bomber. The aircraft was carrying four hydrogen bombs when a cabin fire forced the crew to abandon the aircraft. Six crew members ejected safely, but one who did not have an ejection seat was killed while trying to bail out. The bomber crashed onto sea ice in Greenland, causing the nuclear payload to rupture and disperse, which resulted in widespread radioactive contamination. One of the bombs remains lost.
- September 18–19, 1980: the Damascus Accident, occurred in Damascus, Arkansas, where a Titan missile equipped with a nuclear warhead exploded. The accident was caused by a maintenance man who dropped a socket from a socket wrench down an 80-foot (24 m) shaft, puncturing a fuel tank on the rocket. Leaking fuel resulted in a hypergolic fuel explosion, jettisoning the W-53 warhead beyond the launch site.
Nuclear testing and fallout
Over 2,000 nuclear tests have been conducted in over a dozen different sites around the world. Red Russia/Soviet Union, blue France, light blue United States, violet Britain, yellow China, orange India, brown Pakistan, green North Korea and light green (territories exposed to nuclear bombs). The Black dot indicates the location of the Vela Incident
This view of downtown Las Vegas
shows a mushroom cloud
in the background. Scenes such as this were typical during the 1950s. From 1951 to 1962 the government conducted 100 atmospheric tests at the nearby Nevada Test Site
Over 500 atmospheric nuclear weapons tests were conducted at various sites around the world from 1945 to 1980. 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
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".
As public awareness and concern mounted over the possible health hazards associated with exposure to the nuclear fallout
, various studies were done to assess the extent of the hazard. A Centers for Disease Control and Prevention
/ National Cancer Institute
study claims that fallout from atmospheric nuclear tests would lead to perhaps 11,000 excess deaths among people alive during atmospheric testing in the United States from all forms of cancer, including leukemia, from 1951 to well into the 21st century.
As of March 2009, the U.S. is the only nation that compensates nuclear test victims. Since the Radiation Exposure Compensation Act
of 1990, more than $1.38 billion in compensation has been approved. The money is going to people who took part in the tests, notably at the Nevada Test Site
, and to others exposed to the radiation.
In addition, leakage of byproducts of nuclear weapon production into groundwater has been an ongoing issue, particularly at the Hanford site
Effects of nuclear explosions
Effects of nuclear explosions on human health
A photograph of Sumiteru Taniguchi
's back injuries taken in January 1946 by a U.S. Marine photographer
Some scientists estimate that a nuclear war with 100 Hiroshima-size nuclear explosions on cities could cost the lives of tens of millions of people from long-term climatic effects alone. The climatology hypothesis is that if
each city firestorms
, a great deal of soot could be thrown up into the atmosphere which could blanket the earth, cutting out sunlight for years on end, causing the disruption of food chains, in what is termed a nuclear winter
People near the Hiroshima explosion and who managed to survive the explosion subsequently suffered a variety of medical effects:
- Initial stage—the first 1–9 weeks, in which are the greatest number of deaths, with 90% due to thermal injury and/or blast effects and 10% due to super-lethal radiation exposure.
- Intermediate stage—from 10 to 12 weeks. The deaths in this period are from ionizing radiation in the median lethal range – LD50
- Late period—lasting from 13 to 20 weeks. This period has some improvement in survivors' condition.
- Delayed period—from 20+ weeks. Characterized by numerous complications, mostly related to healing of thermal and mechanical injuries, and if the individual was exposed to a few hundred to a thousand millisieverts of radiation, it is coupled with infertility, sub-fertility and blood disorders. Furthermore, ionizing radiation above a dose of around 50–100 millisievert exposure has been shown to statistically begin increasing one's chance of dying of cancer sometime in their lifetime over the normal unexposed rate of ~25%, in the long term, a heightened rate of cancer, proportional to the dose received, would begin to be observed after ~5+ years, with lesser problems such as eye cataracts and other more minor effects in other organs and tissue also being observed over the long term.
Fallout exposure—depending on if further afield individuals shelter in place
or evacuate perpendicular to the direction of the wind, and therefore avoid contact with the fallout plume, and stay there for the days and weeks after the nuclear explosion, their exposure to fallout
, and therefore their total dose, will vary. With those who do shelter in place, and or evacuate, experiencing a total dose that would be negligible in comparison to someone who just went about their life as normal.
Staying indoors until after the most hazardous fallout isotope
decays away to 0.1% of its initial quantity after ten half lifes
—which is represented by 80 days in I-131s
case, would make the difference between likely contracting Thyroid cancer
or escaping completely from this substance depending on the actions of the individual.
Protest in Bonn against the nuclear arms race
between the U.S./NATO and the Warsaw Pact, 1981
Demonstration against nuclear testing in Lyon
, France, in the 1980s.
Peace movements emerged in Japan and in 1954 they converged to form a unified "Japan 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".
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.
A resurgence of interest occurred amid European and American fears of nuclear war
in the 1980s.
Costs and technology spin-offs
Peaceful nuclear explosions are nuclear explosions
conducted for non-military purposes, such as activities related to economic development
including the creation of canals
. During the 1960s and 1970s, both the United States and the Soviet Union conducted a number of PNEs. Six of the explosions by the Soviet Union are considered to have been of an applied nature, not just tests.
The United States and the Soviet Union later halted their programs. Definitions and limits are covered in the Peaceful Nuclear Explosions Treaty of 1976.
The stalled Comprehensive Nuclear-Test-Ban Treaty
of 1996 would prohibit all nuclear explosions, regardless of whether they are for peaceful purposes or not.
History of development
In nuclear fission
, the nucleus of a fissile atom (in this case, enriched uranium
) absorbs a thermal neutron, becomes unstable and splits into two new atoms, releasing some energy and between one and three new neutrons, which can perpetuate the process.
In the first decades of the 20th century, physics
was revolutionized with developments in the understanding of the nature of atoms
. In 1898, Pierre
and Marie Curie
discovered that pitchblende
, an ore of uranium
, contained a substance—which they named radium
—that emitted large amounts of radioactivity
. Ernest Rutherford
and Frederick Soddy
identified that atoms were breaking down and turning into different elements. Hopes were raised among scientists and laymen that the elements around us could contain tremendous amounts of unseen energy, waiting to be harnessed.
In December 1938, Otto Hahn
and Fritz Strassmann
reported that they had detected the element barium
after bombarding uranium with neutrons. Lise Meitner
and Otto Robert Frisch
correctly interpreted these results as being due to the splitting of the uranium atom. Frisch confirmed this experimentally on January 13, 1939.
They gave the process the name "fission" because of its similarity to the splitting of a cell
into two new cells. Even before it was published, news of Meitner's and Frisch's interpretation crossed the Atlantic.
Scientists at Columbia University
decided to replicate the experiment and on January 25, 1939, conducted the first nuclear fission experiment in the United States
in the basement of Pupin Hall
. The following year, they identified the active component of uranium as being the rare isotope uranium-235
By the start of the war in September 1939, many scientists likely to be persecuted by the Nazis had already escaped. Physicists on both sides were well aware of the possibility of utilizing nuclear fission as a weapon, but no one was quite sure how it could be engineered. In August 1939, concerned that Germany might have its own project
to develop fission-based weapons, Albert Einstein
signed a letter
to U.S. President Franklin D. Roosevelt warning him of the threat.
Roosevelt responded by setting up the Uranium Committee
under Lyman James Briggs
but, with little initial funding ($6,000), progress was slow. It was not until the U.S. entered the war in December 1941 that Washington decided to commit the necessary resources to a top-secret high priority bomb project.
Organized research first began in Britain and Canada as part of the Tube Alloys
project: the world's first nuclear weapons project. The Maud Committee
was set up following the work of Frisch and Rudolf Peierls
who calculated uranium-235's critical mass and found it to be much smaller than previously thought which meant that a deliverable bomb should be possible.
In the February 1940 Frisch–Peierls memorandum
they stated that: "The energy liberated in the explosion of such a super-bomb...will, for an instant, produce a temperature comparable to that of the interior of the sun. The blast from such an explosion would destroy life in a wide area. The size of this area is difficult to estimate, but it will probably cover the centre of a big city."
, a director of Shinkolobwe Mine
in the Congo which produced by far the highest quality uranium ore in the world, had become aware of uranium's possible use in a bomb. In late 1940, fearing that it might be seized by the Germans, he shipped the mine's entire stockpile of ore to a warehouse in New York.
For 18 months British research outpaced the American but by mid-1942, it became apparent that the industrial effort required was beyond Britain's already stretched wartime economy.:204
In September 1942, General Leslie Groves
was appointed to lead the U.S. project which became known as the Manhattan Project
. Two of his first acts were to obtain authorization to assign the highest priority AAA rating on necessary procurements, and to order the purchase of all 1,250 tons of the Shinkolobwe ore.
The Tube Alloys project was quickly overtaken by the U.S. effort
and after Roosevelt and Churchill signed the Quebec Agreement
in 1943, it was relocated and amalgamated into the Manhattan Project.
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- Laura Grego and David Wright, "Broken Shield: Missiles designed to destroy incoming nuclear warheads fail frequently in tests and could increase global risk of mass destruction", Scientific American, vol. 320, no. no. 6 (June 2019), pp. 62–67. "Current U.S. missile defense plans are being driven largely by technology, politics and fear. Missile defenses will not allow us to escape our vulnerability to nuclear weapons. Instead large-scale developments will create barriers to taking real steps toward reducing nuclear risks—by blocking further cuts in nuclear arsenals and potentially spurring new deployments." (p. 67.)
- Michael T. Klare, "Missile Mania: The death of the INF [Intermediate-Range Nuclear Forces] Treaty [of 1987] has escalated the arms race", The Nation, vol. 309, no. 6 (September 23, 2019), p. 4.
- Moniz, Ernest J., and Sam Nunn, "The Return of Doomsday: The New Nuclear Arms Race – and How Washington and Moscow Can Stop It", Foreign Affairs, vol. 98, no. 5 (September / October 2019), pp. 150–161. Former U.S. Secretary of Energy Ernest Moniz and former U.S. Senator Sam Nunn write that "the old [strategic] equilibrium" between the United States and Russia has been "destabilized" by "clashing national interests, insufficient dialogue, eroding arms control structures, advanced missile systems, and new cyberweapons... Unless Washington and Moscow confront these problems now, a major international conflict or nuclear escalation is disturbingly plausible—perhaps even likely." (p. 161.)
- Thomas Powers, "The Nuclear Worrier" (review of Daniel Ellsberg, The Doomsday Machine: Confessions of a Nuclear War Planner, New York, Bloomsbury, 2017, ISBN 9781608196708, 420 pp.), The New York Review of Books, vol. LXV, no. 1 (January 18, 2018), pp. 13–15.
- Eric Schlosser, Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety, Penguin Press, 2013, ISBN 1594202273. The book became the basis for a 2-hour 2017 PBS American Experience episode, likewise titled "Command and Control". Nuclear weapons continue to be equally hazardous to their owners as to their potential targets. Under the 1970 Treaty on the Non-Proliferation of Nuclear Weapons, nuclear-weapon states are obliged to work toward the elimination of nuclear weapons.
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