This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (May 2018) (Learn how and when to remove this template message)

The Mark 22 nuclear bomb (Mk-22) was the first thermonuclear device test by the University of California Radiation Lab (UCRL). The test was part of the Koon shot of Operation Castle. The Mk-22 failed to achieve anything like its intended yield due to premature heating of the secondary from exposure to neutrons. As the other UCRL test planned for the Castle series, the liquid-fueled "Ramrod" device had the same basic design flaw, that test was canceled. Within a month of the bomb's failure, the Mk-22 was terminated because the United States Atomic Energy Commission realized there was nothing that could be done to salvage the design.

References

Hansen, Chuck. U.S. Nuclear Weapons. Arlington, Texas, Areofax, Inc., 1988. ISBN 0-517-56740-7.
Gibson, James N. “Complete List of All U.S. Nuclear Weapons.” List of All U.S. Nuclear Weapons, 1996, nuclearweaponarchive.org/Usa/Weapons/Allbombs.html.
“1954 - Pacific Proving Ground.” Operation Castle, 17 May 2006, nuclearweaponarchive.org/Usa/Tests/Castle.html.
Hernandez, Daniel. “Post ‘Ivy Mike’ and ‘Castle Bravo.’” United States History of Thermonuclear Weapons Development, Stanford University, 8 Mar. 2015, large.stanford.edu/courses/2015/ph241/hernandez2/.
Hansen, Chuck, "Swords of Armageddon: U.S. Nuclear Weapons Development since 1945" (CD-ROM & download available). PDF-2.67 Mb. 2,600 pages, Sunnyvale, California, Chucklea Publications, 1995, 2007. ISBN 978-0-9791915-0-3 (2nd Ed.)

United States nuclear devices

Fission
(including
boosted)

Gravity bombs	Little Boy (Mark 1) Thin Man (Mark 2) Fat Man (Mark 3) Mark 4 Mark 5 Mark 6 Mark 7 Mark 8 Mark 10 Mark 11 Mark 12 Mark 13 Mark 18 Mark 20 Mk 105 B57
Warheads	W4 W5 W7 W8 W12 W13 W25 W30 W31 W34 W37 W40 W42 W44 W45 XW-51 W54 W72 W76-2 W81
Depth bombs	Mark 90 Mk 101 Mk 105 B57
Artillery	W9 W19 W23 W33 W48 W54 W74 W75 W79-1 W82-1
Atomic demolition munitions	XM1 ADM T2 ADM T4 Medium Atomic Demolition Munition (MADM) Special Atomic Demolition Munition (SADM) Tactical Atomic Demolition Munition (TADM)

Thermonuclear

Gravity bombs	Mark 14 Mark 15 TX16 Mark 17 Mark 21 TX22 Mark 24 Mark 26 Mark 27 B28 Mark 36 Mark 39 B41 B43 TX46 B53 B61 B77 B83 B90
Depth bombs	B90
Warheads	W15 W27 W28 TX29 XW-35 W38 W39 W41 XW-46 W47 W49 W50 W52 W53 W55 W56 W58 W59 W60 W61 W62 W63 W64 W67 W68 W69 W70 W71 W73 W76 W78 W80 W84 W85 W86 W87 W88 W89 W91 Reliable Replacement Warhead (RRW) W93

Enhanced
radiation

Warheads	W63 W64 W65 W66 W70-3
Artillery	W79-0 W82-0

Primary stages

Experimental