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Fat Man Replica of the original Fat Man bomb Type Nuclear fission gravity bomb Place of origin United States Production history Designer Los Alamos Laboratory Produced 1945–1949 No. built 120 Specifications Mass 10,300 pounds (4,670 kg) Length 128 inches (3.3 m) Diameter 60 inches (1.5 m) Filling Plutonium Filling weight 6.2 kg Blast yield 21 kt (88 TJ) "Fat Man" (also known as Mark III) was ...
Nagasaki's "Fat Man" gravity bomb 19–23 79–96 Implosion type plutonium-239 fission bomb (the second of the two nuclear weapons used in warfare). 6.2 kg of Plutonium-239, about 1 kg fissioned W76 warhead 100 420 Twelve of these may be in a MIRVed Trident II missile; treaty limited to eight. W87 warhead 300 1,300
Mark 4 – Post-war "Fat Man" redesign. Bomb designed with weapon characteristics as the foremost criteria. (1949–1953) Mark 5 – Significantly smaller high efficiency nuclear bomb. (1–120 kilotons, 1952–1963) Mark 6 – Improved version of Mk-4. (8–160 kilotons, 1951–1962) Mark 7 – Multi-purpose tactical bomb. (8–61 kilotons ...
A fleet of 95 target ships was assembled in Bikini Lagoon and hit with two detonations of Fat Man plutonium implosion-type nuclear weapons of the kind dropped on Nagasaki in 1945, each with a yield of 23 kilotons of TNT (96 TJ). The first test was Able.
Fat Man was 1.5 metres (5 ft) wide vs 61 centimetres (2 ft) for Little Boy. The Pu-239 pit of Fat Man was only 9.1 centimetres (3.6 in) in diameter, the size of a softball. The bulk of Fat Man's girth was the implosion mechanism, namely concentric layers of U-238, aluminium, and high explosives.
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A Fat Man was 17.5 times as efficient as a Little Boy, but a ton of uranium ore could yield eight times as much uranium-235 as plutonium, and on a per-gram basis, plutonium cost somewhere between four and eight times as much to produce as uranium-235, [6] which at this time cost around $26 per gram.