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Core of a nuclear implosion weapon
In nuclear weapon design, the pit is the core of an implosion nuclear weapon, consisting of fissile material and any neutron reflector or tamper bonded
Pit_(nuclear_weapon)
Nuclear weapons design means the physical, chemical, and engineering arrangements that cause the physics package of a nuclear weapon to detonate. There
Nuclear_weapon_design
Nuclear bomb
Cold War. It is a low-to-intermediate yield strategic and tactical nuclear weapon featuring a two-stage radiation implosion design. The B61 is of the
B61_nuclear_bomb
Air-dropped nuclear fission weapon
and plutonium only pits. The exact pit assemblies were common with several other U.S. nuclear weapons, the Type C and Type D pit assemblies. Along with
Mark_4_nuclear_bomb
Crash of US Air Force bomber with nuclear warheads
safeguards meant to prevent that from occurring. One of its nuclear bombs was judged by nuclear weapons engineers at the time to have been only one safety switch
1961_Goldsboro_B-52_crash
Arrow (nuclear) International Nuclear Event Scale List of accidents and incidents involving military aircraft Lists of disasters Nuclear weapon Radiation
List of military nuclear accidents
List_of_military_nuclear_accidents
The United States holds the second largest arsenal of nuclear weapons among the nine nuclear-armed countries. Under the Manhattan Project, the United States
Nuclear weapons of the United States
Nuclear_weapons_of_the_United_States
Nuclear weapon design
The Mark 5 nuclear bomb and W5 nuclear warhead were a common core American nuclear weapon design, designed in the early 1950s and which saw service from
Mark_5_nuclear_bomb
of nuclear weapons is the world's third-largest, estimated at 620 nuclear warheads as of 2026[update]. China was the fifth country to develop nuclear weapons
Nuclear_weapons_of_China
World's atomic warhead designs, 1945–present
are known to possess a nuclear triad, being capable to deliver nuclear weapons by land, sea and air. American nuclear weapons of all types – bombs, warheads
List_of_nuclear_weapons
Nuclear bomb
kilotonnes of TNT (33 and 255 TJ) by using different weapon pits (cores). Implosion nuclear weapon English Electric Canberra (Royal Air Force) Douglas
Mark_7_nuclear_bomb
U.S. atomic bomb type used at Nagasaki, 1945
as Mark III) was the design of the nuclear weapon the United States used for seven of the first eight nuclear weapons ever detonated in history. It is also
Fat_Man
Act of eliminating nuclear weapons
Nuclear disarmament is the act of reducing or eliminating nuclear weapons. Its end state can also be a nuclear-weapons-free world, in which nuclear weapons
Nuclear_disarmament
Controlled detonation of nuclear weapons for scientific or political purposes
Nuclear weapons tests are experiments carried out to determine the performance of nuclear weapons and the effects of their explosion. Over 2,000 nuclear
Nuclear_weapons_testing
Topics referred to by the same term
which allows the exchange of fluids Pit (nuclear weapon), the core of an implosion weapon Pit bull, a breed of dog PIT tag, Passive Integrated Transponder
Pit
Theoretical illicit nuclear weapon
Improvised nuclear device (IND) is a theoretical illicit nuclear weapon bought, stolen, or otherwise originating from a nuclear state, or a weapon fabricated
Improvised_nuclear_device
Weapon that can kill many people or cause great damage
A weapon of mass destruction (WMD) is a biological, chemical, radiological, nuclear, or any other weapon that can kill or significantly harm many people
Weapon_of_mass_destruction
Multi-stage fusion-fission nuclear weapon
thermonuclear weapon, fusion weapon or hydrogen bomb (H-bomb) is a second-generation nuclear weapon, using nuclear fusion. The most destructive weapons ever created
Thermonuclear_weapon
Topics referred to by the same term
protein Nuclear reactor core, a portion containing the fuel components Pit (nuclear weapon) or core, the fissile material in a nuclear weapon Semiconductor
Core
test nuclear weapons. The UK is one of nine nuclear-armed states, and one of five recognized by the Treaty on the Non-Proliferation of Nuclear Weapons. As
Nuclear weapons of the United Kingdom
Nuclear_weapons_of_the_United_Kingdom
This timeline of nuclear weapons development is a chronological catalog of the evolution of nuclear weapons rooting from the development of the science
Timeline of nuclear weapons development
Timeline_of_nuclear_weapons_development
Part of the post-WWII era and the Cold War
period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though no other country engaged in warhead
Nuclear_arms_race
National laboratory site in Nilore, Islamabad
responsibility by ensuring the safety, security, and reliability of nation's nuclear weapons program by advancing applications in science and technology. The PINSTECH
Pakistan Institute of Nuclear Science & Technology
Pakistan_Institute_of_Nuclear_Science_&_Technology
Alloy used in nuclear weapon pits
(Pu–Ga) is an alloy of plutonium and gallium used in nuclear weapon pits, the component of a nuclear weapon where the fission chain reaction is started. This
Plutonium–gallium_alloy
Proposed British tactical nuclear weapon
was a British tactical nuclear weapon project in the 1950s. The project's goal was to store a number of ten-kiloton nuclear land mines in Germany. These
Blue_Peacock
Nuclear weapon
U.S. Nuclear Weapons". www.nuclearweaponarchive.org. Retrieved 2018-10-16. Fahrenholtz, Jill C (September 1997). Development of an Automated Pit Packaging
W85_(nuclear_warhead)
Type of bomb
pit options gave nuclear yields of 18, 26, 80, 154, and 160 kilotons for Mark 6 models. There are several Mark 6 casings on display: Defense Nuclear Weapons
Mark_6_nuclear_bomb
Accidental bomb release from an aircraft
The 1950 Rivière-du-Loup B-50 nuclear weapon loss incident was the loss of a nuclear weapon near Rivière-du-Loup, Quebec, Canada, during the fall of 1950
1950 Rivière-du-Loup B-50 nuclear weapon loss incident
1950_Rivière-du-Loup_B-50_nuclear_weapon_loss_incident
Atomic bomb dropped on Hiroshima
1945, making it the first nuclear weapon used in warfare, and the second nuclear explosion in history, after the Trinity nuclear test. It exploded with an
Little_Boy
Thermonuclear warhead
The Mark 39 nuclear bomb and W39 nuclear warhead were versions of an American thermonuclear weapon, which were in service from 1957 to 1966. The Mark 39
Mark_39_nuclear_bomb
Neutron source used in some nuclear weapons
plutonium pit, and is activated by impact of the converging shock wave. One of the key elements in the proper operation of a nuclear weapon is initiation
Modulated_neutron_initiator
British nuclear weapon
Herald was a British nuclear weapon, tested on 31 May 1957. It used 117 kg of highly enriched uranium, more than any other nuclear weapon built or tested,[citation
Orange_Herald
American nuclear bomb design
500 kilotons. Nuclear weapon designer Ted Taylor was the lead designer for the Mark 18. The Mark 18 was tested once, in the Ivy King nuclear test at the
Mark_18_nuclear_bomb
First Chinese nuclear test, 1964
callsign; Chic-1 by the US intelligence agencies) was the first nuclear test of the nuclear weapons program of China, detonated on 16 October 1964, at the Lop
Project_596
Low-yield thermonuclear weapon
itself. The neutron release generated by a nuclear fusion reaction is intentionally allowed to escape the weapon, rather than being absorbed by its other
Neutron_bomb
Man weapon-design as unworkable. The difference in purity, of how much, continues to be important in assessing significance in the context of nuclear proliferation
Reactor-grade_plutonium
nuclear weapons to defend themselves against an offensive assault from the Soviet Union. From 1945 to 1972 the government ran a clandestine nuclear weapons
Swedish nuclear weapons program
Swedish_nuclear_weapons_program
Option available on many nuclear weapons
dial-a-yield, is an option available on most modern nuclear weapons. It allows the operator to specify a weapon's yield, or explosive power, allowing a single
Variable_yield
List of incidents which could have led to a nuclear exchange
strategic and tactical nuclear weapons in Cuba, totalling 158 warheads. Of these, 80 were for use by the 9K52 Luna-M nuclear rocket artillery/short-range
Nuclear_close_calls
1945–1946 sphere of plutonium
bomb. It was manufactured in 1945 by the Manhattan Project, the U.S. nuclear weapon development effort during World War II. It was a subcritical mass that
Demon_core
American lightweight bomb (1954–1962)
pit, and 92-point detonation. It used an automatic in-flight insertion system for safing, in which its nuclear material was kept inside of the weapon
Mark_12_nuclear_bomb
Uranium processed to increase the percentage of uranium-235
neutrons. Enriched uranium is used in both civil nuclear power generation and military nuclear weapons. Low-enriched uranium (LEU), containing less than
Enriched_uranium
US Air Force incident involving a nuclear bomb
authorized to fly with nuclear capsules on board. Such approval would not come until safer "sealed-pit nuclear capsule" weapons began to be deployed in
1958 Tybee Island mid-air collision
1958_Tybee_Island_mid-air_collision
American thermonuclear missile warhead
Los Alamos National Laboratory. The weapons are part of a National Nuclear Security Administration nuclear weapons lifecycle program. The W87 design includes
W87
American nuclear artillery shell
guns, and would use nuclear components from the W9 11-inch (280 mm) nuclear artillery shell. The initial army designation for the weapon was Shell, AE, 8-inch
W33_(nuclear_warhead)
Smallest amount of fissile material needed to sustain a nuclear reaction
It is an important parameter of a nuclear reactor core or nuclear weapon. The concept is important in nuclear weapon design. Critical size is the minimum
Critical_mass
Testing and maintenance of American nuclear weapons
certification, and the maintenance of its nuclear weapons without the use of nuclear testing. Because no new nuclear weapons have been developed by the United
Stockpile_stewardship
Problem in nuclear reactor start-up
The iodine pit, also called the iodine hole or xenon pit, is a temporary disabling of a nuclear reactor due to the buildup of short-lived neutron poisons
Iodine_pit
Type of radiological weapon
incidents Nuclear and radiation accidents and incidents Nuclear terrorism Nuclear warfare Nuclear weapon design Operation Groundhog Radiation poisoning Radiological
Dirty_bomb
1946 nuclear weapon tests at Bikini Atoll
Crossroads was a pair of nuclear weapon tests conducted by the United States at Bikini Atoll in mid-1946. They were the first nuclear weapon tests since Trinity
Operation_Crossroads
1972 Chinese atmospheric nuclear test
border. The weapon was developed with the specific objective of destroying Soviet armored division columns. Unlike previous Chinese nuclear weapons, it was
Kuangbiao-1
Type of atomic bomb
were considered to be fizzles. All other nuclear weapons programs have relied on fast neutrons in their weapons designs. In early phases of Manhattan Project
Uranium_hydride_bomb
program intended to develop nuclear weapons, violating its word on the Treaty on the Non-Proliferation of Nuclear Weapons of 1970. The program ended after
Romania and weapons of mass destruction
Romania_and_weapons_of_mass_destruction
American thermonuclear bomb design
the weapon's pit into the implosion assembly. A Mark 24 casing is on display in the Castle Air Museum in Atwater, California. List of nuclear weapons Nuclear
Mark_24_nuclear_bomb
air transports. Defence Nuclear Materials are moved using the following transport means: Trident nuclear weapons, special nuclear material (SNM) and new
Defence Nuclear Material Transport Operations
Defence_Nuclear_Material_Transport_Operations
Proposed US nuclear weapon
fire-resistant pits, and advanced detonator safety systems. The W89 was also reportedly designed using recycled pits from the earlier W68 nuclear weapon program
Reliable_Replacement_Warhead
Defunct American nuclear weapons manufacturing site in Colorado
complex that produced nuclear weapons parts near Denver, Colorado. The facility's primary mission was the fabrication of plutonium pits, the fissionable part
Rocky_Flats_Plant
Device for controlled nuclear reactions
reducing nuclear waste and recovering reactor-usable fuel. This also poses a nuclear proliferation risk via production of plutonium for nuclear weapons. Reactor
Nuclear_reactor
From 1962 until 1971, British nuclear weapons were stored in Singapore, for delivery by aircraft at RAF Tengah, and via the frequent transiting of aircraft
Singapore and weapons of mass destruction
Singapore_and_weapons_of_mass_destruction
Shaped charge used in nuclear weapons
An explosive lens—as used, for example, in nuclear weapons—is a highly specialized shaped charge. In general, it is a device composed of several explosive
Explosive_lens
1962 underground nuclear test at the Nevada Test Site
Storax Sedan was a shallow underground nuclear test conducted in Area 10 of Yucca Flat at the Nevada National Security Site on July 6, 1962, as part of
Sedan_(nuclear_test)
First detonation of a nuclear weapon
Trinity was the first detonation of a nuclear weapon, conducted by the United States Army at 5:29 a.m. Mountain War Time (11:29:21 GMT) on July 16, 1945
Trinity_(nuclear_test)
Proposed multilateral treaty
A nuclear weapons convention is a proposed multilateral treaty to eliminate nuclear weapons. This might include prohibitions on the possession, development
Nuclear_weapons_convention
World War II Allied nuclear weapons program
development program undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom
Manhattan_Project
Cold War disappearance of a nuclear-equipped Boeing B-47
transporting two sealed capsules containing nuclear pits, but was not carrying any complete nuclear weapons, making a nuclear detonation impossible. The accident
1956 USAF Boeing B-47 disappearance
1956_USAF_Boeing_B-47_disappearance
Isotope of uranium
was investigated for use in nuclear weapons and as a reactor fuel. It has been used successfully in experimental nuclear reactors and has been proposed
Uranium-233
American thermonuclear warhead design
fire-resistant pits, and advanced detonator safety systems. The W89 was also reportedly designed using recycled pits from the earlier W68 nuclear weapon program
W89
Secret laboratory established by the Manhattan Project
alternative design proposed by John von Neumann, an implosion-type nuclear weapon, which was called Fat Man. A variant of the gun-type design known as
Project_Y
Atomic weapons tests in Australia, 1956–1963
Approximate weapon yields ranged from 1 to 27 kilotons of TNT (4 to 100 TJ). The Maralinga site was also used for minor trials, tests of nuclear weapons components
British nuclear tests at Maralinga
British_nuclear_tests_at_Maralinga
US Department of Energy reservation in South Carolina
site was built during the 1950s to produce plutonium and tritium for nuclear weapons. It covers 310 square miles (800 km2) and employs more than 10,000
Savannah_River_Site
Material used to produce nuclear energy
The EM also works with the National Nuclear Security Administration (NNSA) to dispose the surplus, non-pit, weapons-usable plutonium-239. EM with the NNSA
Nuclear_material
for Nuclear Accountability (ANA) is a network of local, regional and national organizations working collaboratively on issues of nuclear weapons production
Alliance for Nuclear Accountability
Alliance_for_Nuclear_Accountability
First industrial-scale reactor in the Soviet Union
The A-1 was the first nuclear reactor in the Soviet Union for the industrial production of weapons-grade plutonium, built and operated at the Mayak Production
A-1_(nuclear_reactor)
Series of 1940s US nuclear tests
designs, especially the more efficient levitated pits, rather than of the effects of nuclear weapons. Three tests were carried out in April and May 1948
Operation_Sandstone
Hungarian-American physicist (1908–2003)
to having any nuclear weapons in Canada. After Diefenbaker was out of office, Canada went on to have nuclear weapons, from a US nuclear sharing agreement
Edward_Teller
Nuclear weapon
issues after the weapon produced an unexpectedly low yield in a simulated ageing test. This issue was corrected without redesign of the nuclear explosive sub-assembly
W84
weapons production presents a risk of nuclear proliferation, however all nuclear weapons states derived the material for their first nuclear weapon from
Environmental impact of nuclear power
Environmental_impact_of_nuclear_power
Crash of a nuclear-armed U.S. Air Force plane in northern California
Stratofortress bomber, AF Serial No. 57-0166, c/n 464155, carrying two nuclear weapons departed from Mather Air Force Base near Sacramento. According to the
1961_Yuba_City_B-52_crash
Detonator fired by electric current
simultaneously, mainly for use in plutonium-based nuclear weapons in which a plutonium core (called a pit) is compressed very rapidly. This is achieved via
Exploding-bridgewire detonator
Exploding-bridgewire_detonator
Defunct American nuclear production site
produced plutonium for most of the more than 60,000 weapons built for the U.S. nuclear arsenal. Nuclear technology developed rapidly during this period,
Hanford_Site
network analysis Pis'ma v Astronomicheskii Zhurnal Piston (optics) Pit (nuclear weapon) Pitch-up Pitch drop experiment Pitching moment Pitot tube Piyare
Index_of_physics_articles_(P)
American thermonuclear warhead
design entered into a Phase 2 design competition between the various nuclear weapons laboratories in November 1988. Further development details are somewhat
W91
American hydrogen bomb
save for the design of their primary section. They were the largest nuclear weapons ever put into service by the United States; only the Convair B-36 Peacemaker
Mark_17_nuclear_bomb
Nuclear weapons testing, uranium mining and export, and nuclear power have often been the subject of public debate in Australia, and the anti-nuclear
Anti-nuclear movement in Australia
Anti-nuclear_movement_in_Australia
1954 U.S. thermonuclear weapon test in the Marshall Islands
remains the most powerful nuclear device ever detonated by the United States and the first lithium deuteride–fueled thermonuclear weapon tested using the Teller–Ulam
Castle_Bravo
Series of 1950s US nuclear tests
with plutonium; this was based on the plutonium/U-235 pit from the TX-7E, a prototype Mark 7 nuclear bomb design used in the 1951 Operation Buster-Jangle
Operation_Teapot
American thermonuclear warhead designed in the late 1950s/early 1960s
Though derived from the W47, Sandia believed that as the non-nuclear components of the weapon would be lighter than those in the W47, with the gross warhead
W56
a number of nuclear whistleblowers, often nuclear engineers, who have identified safety concerns about nuclear power and nuclear weapons production. That
List of nuclear whistleblowers
List_of_nuclear_whistleblowers
1952 British atomic bomb test in Western Australia
became the third nuclear power, after the United States and the Soviet Union. During the Second World War, Britain commenced a nuclear weapons project, code-named
Operation_Hurricane
Depression caused by an impact or geologic activity
notable example is the Nevada Test Site, which was historically used for nuclear weapons testing over a period of 41 years. Subsidence craters are created as
Crater
U.S. nuclear weapons agency until 1947
Armed Forces Special Weapons Project (AFSWP) was a United States military agency responsible for those aspects of nuclear weapons remaining under military
Armed Forces Special Weapons Project
Armed_Forces_Special_Weapons_Project
Material with the ability to reflect neutrons; used to control fission reactions
reactor core. Tamper (nuclear weapon) Neutron scattering Neutron supermirror Duderstadt, James J.; Hamilton, Louis J. (1976). Nuclear reactor analysis. New
Neutron_reflector
Intercontinental ballistic missile
START treaty with Russia unless Obama agreed to revamp the US nuclear triad: nuclear weapons that could be launched from land, sea, and air. In a written
LGM-35_Sentinel
Laboratory near Santa Fe, New Mexico
designing and assembling nuclear weapons under the Manhattan Project during World War II. This included both nuclear weapons used in the atomic bombings
Los Alamos National Laboratory
Los_Alamos_National_Laboratory
American physicist and nuclear weapons designer (1929–2011)
and nuclear weapons designer at Lawrence Livermore National Laboratory. Sack worked as a program manager and primary designer on the B77 nuclear bomb
Seymour_Sack
Nuclear energy extracted from thorium isotopes
superior physical and nuclear fuel properties, and reduced nuclear waste production. Thorium fuel also has a lower weaponization potential because it is
Thorium-based_nuclear_power
Radiation workers health and labor issues
Nuclear labor issues exist within the international nuclear power industry and the nuclear weapons production sector worldwide, impacting the lives and
Nuclear_labor_issues
US post-Soviet counterproliferation program
NATO allies grew concerned that Soviet weapons of mass destruction i.e. its nuclear, chemical, and biological weapons, would fall into the hands of adversarial
Nunn–Lugar Cooperative Threat Reduction
Nunn–Lugar_Cooperative_Threat_Reduction
1986 nuclear accident in the Soviet Union
Stone, Richard (5 May 2021). "'It's like the embers in a barbecue pit.' Nuclear reactions are smoldering again at Chernobyl". Science. American Association
Chernobyl_disaster
Nuclear facility site near Baghdad, Iraq
Baghdad Nuclear Research Facility adjacent to the Tuwaitha "Yellow Cake Factory" or Tuwaitha Nuclear Research Center contains the remains of Iraqi nuclear reactors
Tuwaitha Nuclear Research Center
Tuwaitha_Nuclear_Research_Center
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON
PIT NUCLEAR-WEAPON