Mark 4 nuclear bomb

Mark 4 nuclear bomb
A large bomb resting on a cradle
A Mark 4N riveted aluminum bomb casing. Stockpile Mk 4s used a 2,830 lb (1,280 kg) steel casing.[1]
TypeAir-dropped Nuclear fission weapon
Place of originUnited States
Service history
In service1949–1953
Used byUnited States Air Force (USAF)
Production history
No. builtAbout 550
Specifications
Mass10,800 to 10,900 pounds (4,900 to 4,940 kg)
Length128 in (3,300 mm)
Diameter60 in (1,500 mm)
Crew1x Weaponeer for pit insertion and arming

FillingComposite uranium and plutonium fissile pits
Detonation
mechanism
focused high explosive implosion
Blast yield1, 3.5, 8, 14, 21, 22, 31 kt (4.2, 14.6, 33.5, 58.6, 87.9, 92.0, 129.7 TJ), depending on construction and/or pit

The Mark 4 nuclear bomb was an American implosion-type nuclear bomb based on the earlier Mark 3 Fat Man design, used in the Trinity test and the bombing of Nagasaki. With the Mark 3 needing each individual component to be hand-assembled by only highly trained technicians under closely controlled conditions, the purpose of the Mark 4 was to produce an atomic weapon as a practical piece of ordnance. The Mark 4 Mod 0 entered the stockpile starting March 19, 1949[2] and was in use until 1953. With over 500 units procured, the Mark 4 was the first mass-produced nuclear weapon.

  1. ^ (Hansen 2007, pp. 179–180)
  2. ^ (Sandia Corporation 1967, p. 8)