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	[[~~file~~:~~Fat_man~~.jpg\|thumb~~\|left~~]] [[~~file~~:~~An_Mk_III_postwar_nuclear_weapon,_painted_to_resemble_Fat_Man,_at_the_National_Museum_of_the_United_States_Air_Force~~.jpg\|thumb~~\|left~~]] [[~~file~~:~~ImplosionShapedCharge.gif\|thumb\|right]] [[file:Fat_Man_test_unit_being_raised_from_the_pit_into_the_bomb_bay_of_a_B~~-29.jpg\|thumb~~\|right~~]] [[~~file~~:~~Fat_Man_External~~.svg\|thumb~~\|right~~]] ~~'''~~Fat Man~~''' was the codename for the type of nuclear bomb that was detonated over the Japanese city of [[Nagasaki]] by the [[~~United States~~]] on August 9~~, ~~1945~~, ~~during [[World War II]]~~. ~~It was the second~~ of ~~the only two nuclear weapons ever used in warfare, the first being [[Little Boy]], which was dropped on [[Hiroshima]] three days earlier.~~		[[File:Fat man.jpg\|thumb]] [[File:AirForceMuseum FatManReplica.jpg\|thumb]] [[File:Fat Man test unit being raised from the pit into the bomb bay of a B-29.jpg\|thumb]] [[File:Fat Man External.svg\|thumb]] {{Infobox nuclear weapon
			\| name = Fat Man
			\| image =
			\| caption =
			\| origin = United States
			\| type = Nuclear weapon
			\| designer = Los Alamos Laboratory
			\| design_date = 1944–1945
			\| production_date = 1945
			\| number = 120
			\| weight = 10,300 pounds (4,670 kg)
			\| length = 10.7 feet (3.3 m)
			\| diameter = 5 feet (1.5 m)
			\| yield = 21 kilotons of TNT (88 TJ)
			}}

	~~==Development==~~		'''Fat Man''' was the codename for the type of nuclear bomb that was detonated over the Japanese city of [[Nagasaki]] by the United States on August 9, 1945. It was the second of the only two nuclear weapons ever used in warfare, the first being [[Little Boy]], which was dropped on [[Hiroshima]] on August 6, 1945.
	~~The development of~~ Fat Man was ~~part~~ of the [[~~Manhattan Project~~]], ~~a research and development undertaking during World War II that produced~~ the ~~first~~ nuclear weapons~~. The bomb was an~~ [[~~implosion-type nuclear weapon~~]] ~~with a [[plutonium]] core. The design~~ was ~~more complex than the~~ [[~~gun-type design~~]] ~~used in Little Boy~~.

	==Design==		== Design and Development ==
	Fat Man was an implosion-type weapon ~~that used~~ a core of [[~~plutonium-239~~]]~~. The bomb was 10.7 feet long, 5 feet in diameter~~, and ~~weighed about 10,300 pounds. The design involved surrounding the plutonium core with high explosives~~ that~~, when detonated, compressed~~ the ~~core to a supercritical state, initiating a~~ nuclear ~~chain reaction~~.		Fat Man was an implosion-type nuclear weapon with a plutonium core. The design was more complex than the gun-type design used in Little Boy. The development of Fat Man was part of the [[Manhattan Project]], the United States' research and development project during World War II that produced the first nuclear weapons.

	~~==Deployment==~~		The bomb's design was based on the "[[Trinity (nuclear test)\|Trinity]]" test, which was the first detonation of a nuclear device, conducted on July 16, 1945, in the New Mexico desert. The successful test of the Trinity device confirmed the viability of the implosion method for a plutonium bomb.
	The bomb was ~~dropped by~~ the [[~~B-29 Superfortress]] bomber [[Bockscar~~]], ~~piloted by Major [[Charles Sweeney]]. The intended target~~ was the ~~city~~ of ~~[[Kokura]]~~, ~~but due to poor visibility~~, the ~~mission was redirected to Nagasaki~~. The ~~bomb exploded at an altitude~~ of ~~about 1,650 feet, with~~ a ~~yield of approximately 21 kilotons of TNT~~.

	==~~Impact~~==		=== Implosion Mechanism ===
	The ~~explosion resulted in the immediate deaths~~ of ~~an estimated 40~~,~~000~~ to 75,~~000 people, with total casualties reaching up to 80,000 by the end of 1945 due to injuries and radiation sickness~~. ~~The bombing~~ of ~~Nagasaki, along with~~ the ~~earlier bombing~~ of ~~Hiroshima, played a significant role~~ in ~~Japan's decision~~ to ~~surrender~~, ~~leading to the end of World War II~~.		The implosion mechanism of Fat Man involved a spherical assembly of high-explosive lenses surrounding a plutonium core. When detonated, the explosives compressed the core to a supercritical state, initiating a nuclear chain reaction. This method was necessary for plutonium bombs because of the higher rate of spontaneous fission in plutonium-239 compared to uranium-235, which made a gun-type design impractical.

	==~~Legacy~~==		=== Plutonium Core ===
	The ~~use~~ of Fat Man ~~and Little Boy remains~~ a ~~subject of intense debate and analysis~~. The ~~bombings marked~~ the ~~only use~~ of ~~nuclear weapons in armed conflict and have had a lasting impact on international relations, military strategy, and~~ the ~~global movement for nuclear disarmament~~.		The core of Fat Man was made of plutonium-239, a fissile isotope produced in nuclear reactors. The core was surrounded by a tamper, which reflected neutrons back into the core to increase the efficiency of the reaction.

	==~~See also~~==		== Deployment and Impact ==
			Fat Man was dropped by the B-29 bomber [[Bockscar]], piloted by Major Charles Sweeney. The bomb exploded at an altitude of about 1,650 feet (500 meters) above Nagasaki, with a yield equivalent to 21 kilotons of TNT. The explosion resulted in the immediate deaths of an estimated 40,000 people, with total casualties reaching 70,000 by the end of 1945 due to injuries and radiation sickness.

			The use of Fat Man, along with Little Boy, played a significant role in Japan's decision to surrender, leading to the end of World War II.

			== Legacy ==
			The deployment of Fat Man and Little Boy marked the beginning of the nuclear age, raising ethical and strategic questions about the use of nuclear weapons. The bombings of Hiroshima and Nagasaki remain the only instances of nuclear weapons being used in armed conflict.

			== Also see ==
	* [[Little Boy]]		* [[Little Boy]]
	* [[Manhattan Project]]		* [[Manhattan Project]]
			* [[Trinity (nuclear test)]]
	* [[Nuclear weapon]]		* [[Nuclear weapon]]
	* [[~~World War II~~]]		* [[Hiroshima]]
	* [[~~Hiroshima and~~ Nagasaki]]		* [[Nagasaki]]

	~~==References==~~		{{Nuclear weapons}}
	{{~~Reflist~~}}

	~~==External links==~~		[[Category:Nuclear weapons of the United States]]
	~~{{Commons category\|Fat Man}}~~

	[[Category:Nuclear weapons]]
	[[Category:World War II]]		[[Category:World War II]]
	~~[[Category:Manhattan Project]]~~
	[[Category:1945 in Japan]]		[[Category:1945 in Japan]]
	~~[[Category:History of Nagasaki]]~~

	~~{{Nuclear-weapons-stub}}~~

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2024-05-19T21:34:55Z

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[[file:Fat_man.jpg|thumb|left]] [[file:An_Mk_III_postwar_nuclear_weapon,_painted_to_resemble_Fat_Man,_at_the_National_Museum_of_the_United_States_Air_Force.jpg|thumb|left]] [[file:ImplosionShapedCharge.gif|thumb|right]] [[file:Fat_Man_test_unit_being_raised_from_the_pit_into_the_bomb_bay_of_a_B-29.jpg|thumb|right]] [[file:Fat_Man_External.svg|thumb|right]] '''Fat Man''' was the codename for the type of nuclear bomb that was detonated over the Japanese city of [[Nagasaki]] by the [[United States]] on August 9, 1945, during [[World War II]]. It was the second of the only two nuclear weapons ever used in warfare, the first being [[Little Boy]], which was dropped on [[Hiroshima]] three days earlier.

==Development==
The development of Fat Man was part of the [[Manhattan Project]], a research and development undertaking during World War II that produced the first nuclear weapons. The bomb was an [[implosion-type nuclear weapon]] with a [[plutonium]] core. The design was more complex than the [[gun-type design]] used in Little Boy.

==Design==
Fat Man was an implosion-type weapon that used a core of [[plutonium-239]]. The bomb was 10.7 feet long, 5 feet in diameter, and weighed about 10,300 pounds. The design involved surrounding the plutonium core with high explosives that, when detonated, compressed the core to a supercritical state, initiating a nuclear chain reaction.

==Deployment==
The bomb was dropped by the [[B-29 Superfortress]] bomber [[Bockscar]], piloted by Major [[Charles Sweeney]]. The intended target was the city of [[Kokura]], but due to poor visibility, the mission was redirected to Nagasaki. The bomb exploded at an altitude of about 1,650 feet, with a yield of approximately 21 kilotons of TNT.

==Impact==
The explosion resulted in the immediate deaths of an estimated 40,000 to 75,000 people, with total casualties reaching up to 80,000 by the end of 1945 due to injuries and radiation sickness. The bombing of Nagasaki, along with the earlier bombing of Hiroshima, played a significant role in Japan's decision to surrender, leading to the end of World War II.

==Legacy==
The use of Fat Man and Little Boy remains a subject of intense debate and analysis. The bombings marked the only use of nuclear weapons in armed conflict and have had a lasting impact on international relations, military strategy, and the global movement for nuclear disarmament.

==See also==
* [[Little Boy]]
* [[Manhattan Project]]
* [[Nuclear weapon]]
* [[World War II]]
* [[Hiroshima and Nagasaki]]

==References==
{{Reflist}}

==External links==
{{Commons category|Fat Man}}

[[Category:Nuclear weapons]]
[[Category:World War II]]
[[Category:Manhattan Project]]
[[Category:1945 in Japan]]
[[Category:History of Nagasaki]]

{{Nuclear-weapons-stub}}

Fat Man - Revision history

Prab: CSV import

Prab: CSV import