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((refimprove|date=September 2014))
[[File:Mark 36 nuclear bomb.jpg|thumb|right|160 px|The Mark 36 nuclear bomb ]]
The '''Mk 36''' was a heavy high-yield [[nuclear bomb]] developed by the United States during the 1950s.  It was a [[thermonuclear]], using a multi-stage [[Teller-ulam design|fusion secondary]] system to generate yields up to about 10 megatons [[TNT equivalent]].

== History ==
The Mark 36 was a more advanced version of the earlier [[Mark 21 nuclear bomb]], which was a weaponized version of the "Shrimp" design, the first "dry" ([[lithium deuteride]]) fuelled thermonuclear bomb test, which conducted by the United States in the [[Castle Bravo]] thermonuclear test in 1954.<ref>((cite web| url=http://nuclearweaponarchive.org/Usa/Tests/Castle.html| title=Nuclear Weapon Archive| accessdate=2008-05-02))</ref>

The Mark 21 bomb was developed and deployed immediately after Castle Bravo, in 1955. The Mark 21 design continued to be improved and the Mark 36 device started production in April 1956.<ref name="hew">((cite web| url=http://nuclearweaponarchive.org/Usa/Weapons/Allbombs.html| title=List of all US Nuclear Weapons| accessdate=2008-05-02))</ref>  In 1957, all older Mark 21 bombs were converted to Mark 36 Y1 Mod 1 bombs.  A total of 920 Mark 36 bombs were produced as new build or converted from the 275 Mark 21 bombs produced earlier.

All Mark 36 nuclear bombs were retired between August 1961 and January 1962, replaced by the higher yield [[B41 nuclear bomb]].

==Survivors==
All surviving Mark 36 casings are located in the United States.

A Mark 36 casing is on display in the [[Cold War]] Gallery at the [[National Museum of the United States Air Force]] in [[Dayton, Ohio]].

A Mark 36 casing can be found at the [[Strategic Air and Space Museum]] near [[Ashland, Nebraska]].

A MK 36 can be found in the "Wings Over the Rockies" air museum in the Lowry neighborhood of Denver, Colorado.

== Specifications ==
The Mark 36 bomb was ((convert|56.2|to|59|in|cm)) in diameter, depending on version, and ((convert|150|in|m)) long.  It weighed ((convert|17,500|or|17,700|lb|kg)) depending on version.

There were two major variants, conventional ("dirty") weapon designated the '''Y1''' and a low fission fraction "clean" '''Y2''' version.<ref>((cite report |date=30 June 1958 |title=Quarterly Progress Report to the Joint Committee on Atomic Energy, Part III-Weapons, April-June 1958 (Deleted) |url=https://www.osti.gov/opennet/detail?osti-id=16091909 |publisher=Atomic Energy Commission |page=3 |docket=NV0073758 |access-date= |quote=))</ref> The clean variant used an inert fusion stage tamper-pusher assembly (see [[Teller-Ulam design#Tamper-pusher ablation|Teller-Ulam Design]]) such as lead or tungsten.  The "dirty" variant used a [[depleted uranium]] or U-238 tamper-pusher which would undergo fission during the second stage fusion burn, doubling the weapon yield. [[Chuck Hansen]] wrote in ''Swords of Armageddon'' (1995) that Mark 36 nuclear bomb was produced in two yield versions, clean and dirty. He stated that a clean version of a Mark 36 had a yield of 6 megatons and that a dirty version of a Mark 36 had a maximum yield of 19 megatons.((citation needed|date=February 2024))

== See also ==
* [[List of nuclear weapons]]
* [[Teller-Ulam design]]
* [[Mark 21 nuclear bomb]]

== References ==
((reflist))
<!-- <ref name=hansen-swords> -->* Hansen, Chuck, "[http://www.uscoldwar.com/ Swords of Armageddon]: U.S. Nuclear Weapons Development since 1945" (CD-ROM & download available). PDF-2.67&nbsp;Mb. 2,600 pages, Sunnyvale, California, Chucklea Publications, 1995, 2007. ((ISBN|978-0-9791915-0-3)) (2nd Ed.)
[https://thebulletin.org/2014/03/accidents-will-happen-an-excerpt-from-command-and-control/ Bulletin of the Atomic Scientists]
((United States nuclear devices))

[[Category:Cold War aerial bombs of the United States]]
[[Category:Nuclear bombs of the United States]]
[[Category:Military equipment introduced in the 1950s]]

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