Blasphemy of the most cruel sort.Little Boy was a uranium bomb. Fat Man was a plutonium bomb. The physics was different. The engineering was different. I have become death the destroyer of worlds. Don't give me any Shiva.![]()
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Reference:
Effects of Nuclear Weapons | Science | atomicarchive.com
Construction of CP-1, or Chicago Pile Number One, was done under the football stadium in an abandoned squash court. On December 2, 1942, mankind first harnessed the energy of the atom.

The completed pile contained 771,000 pounds of graphite, 80,590 pounds of uranium oxide and 12,400 pounds of uranium metal when it went critical. It cost about $2.7 million to produce and build. The pile took the form of a flattened ellipsoid which measured 25 feet wide and 20 feet high.
The Gadget

Trinity Test


Little Boy Specifications
Length: 120.0 inches (10 feet / 3.0 meters)
Diameter: 28.0 inches (71.1 cm)
Weight: 9,700 lbs (4,400 kg)
Yield: 15 kiltons (+/- 20%)

The foreground shows the ruins of the Hiroshima Gas Company Building (800 feet from the hypocenter). In the center are the ruins of the Honkawa Elementary School.

Fat Man Specifications
Length: 128.375 inches (10 feet 8 inches / 3.25 meters)
Diameter: 60.25 inches (5 feet / 1.5 meters)
Weight: 10,265 lbs (4,656 kg)
Yield: 21 kilotons (+/- 10%)

Ruins in the foreground are of the Mitsubishi shipbuilding factory. The white building housed the sawmill. The double smoke stacks are a part of the steel mill. This factory is about 4,750 feet (1,450 meters) south of the hypocenter.
Tsar Bomba
Worlds Largest Nuke Explosion
Weight 27,000 kilograms (60,000 lb)
Length 8 metres (26 ft)
Diameter 2.1 metres (6.9 ft)
Blast yield 50 megatons of TNT (210 PJ) (57 Mt actual)