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Many things, the Special Nuclear Materials are just a small percentage. For example the Fat Man bomb was 5 feet diameter and 10 feet long, but the Plutonium used in it was only roughly a 3 inch diameter sphere encased in a roughly 3 inch thick depleted Uranium tamper (total diameter of tamper and core assembly roughly 9 inches). Most of the material making up the rest of the 5 foot sphere around this was conventional explosives (Composition-B and Baritol) to rapidly assemble the Plutonium to a supercritical sphere about 1 inch in diameter, before a neutron source of Beryllium/Polonium triggered the fission. In the nose and tail were electronics to control the safing/arming/firing of the bomb. The casing was a thick Duralumin shell to protect from flack (this turned out to be unneeded and was reduced to a relatively thin steel shell in later designs).

Fusion bombs also contain one or more fusion stages made of a tamper and Lithium-Deuteride fusion fuel. The tamper can be made of many materials, depending on if you want a clean, conventional, or salted bomb. Very very clean fusion bombs are also referred to as neutron bombs.

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9y ago

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