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The Nagasaki bomb 'Fat Man' was plutonium, as was the first nuclear device ever exploded, called the 'gadget', in the Trinity test near Alamogordo, New Mexico.

In between these, the first bomb ever used in war was dropped on Hiroshima. This was the gun-type uranium bomb.

Uranium-238 cannot support the fast neutron chain reaction required to get an explosion.

Note: both bombs DID contain significant amounts of Uranium-238, but it was used as a high density 'tamper' material to contain the blast a few extra microseconds to maximize yield, not as the fuel. It just vaporized and mixed into the fallout as uranium oxides.

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11y ago

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