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The weapon is notable for being the smallest nuclear weapon in both weight and yield to have entered US service. It was a compact implosion device containing plutonium-239 as its fissile material, [ 1 ] and in its various versions and mods it had a yield of 10 to 1,000 tons of TNT (42 to 4,184 gigajoules ).
The weapon was 34 inches (86 cm) long and weighed 120 pounds (54 kg), and was produced in two versions; the Mod 0 and Mod 1. Declassified British document give the yield of the W48 as 100 tonnes of TNT (0.42 TJ), making it one of the smallest nuclear weapons ever developed by the US. [1]
Log–log plot comparing the yield (in kilotonnes) and mass (in kilograms) of various nuclear weapons developed by the United States.. The explosive yield of a nuclear weapon is the amount of energy released such as blast, thermal, and nuclear radiation, when that particular nuclear weapon is detonated, usually expressed as a TNT equivalent (the standardized equivalent mass of trinitrotoluene ...
Extremely small (as small as 5 inches (13 cm) diameter and 24.4 inches (62 cm) long) linear implosion type weapons, which might conceivably fit in a large briefcase or typical suitcase, have been tested, but the lightest of those weighed nearly 100 pounds (45 kg) and had a maximum yield of only 0.19 kiloton (the Swift nuclear device, tested in ...
Tactical nuclear weapons were a large part of the peak nuclear weapons stockpile levels during the Cold War. US scientists with a full-scale cut-away model of the W48, a very small tactical nuclear weapon with an explosive yield equivalent to 72 tons of TNT (0.072 kiloton). Around 100 of such shells were produced during the Cold War.
Advances in nuclear weapons technology, spurred on by the first detonation of the Soviet nuclear bomb in 1949, led to great reductions in the size of nuclear weapons. By 1957, the Atomic Energy Commission (AEC) declared that it had created a small fission warhead that could be deployed for frontline use by infantrymen.
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Weapons variable yield and weight have been plotted at their highest yield and weight. Also indicated on the graph are a few characteristics of the weapons (Little Boy and Fat Man, the early H-bombs, small tactical weapons, and weapons in the enduring stockpile separated by missile warheads and air-dropped bombs).