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The little boy was a gun-type weapon, so the term "core" in relation to modern implosion weapon pits is not the same.

In Little Boy, two subcritical masses of uranium were brought together. The target was a small set of uranium rings. These sat within a heavy target case with tungsten carbide neutron reflector within. The "bullet" was several larger rings backed by a tungsten carbide reflector and a pusher plate, fired down a long artillery barrel by a few bags of cordite. It's possible one or several small mechanical beryllium-polonium neutron generators were inserted into the target used, although not necessary with uranium. When the bullet and target were assembled, the assembly would be completely enclosed inside the tungsten carbide reflector, reflecting neutrons into the now supercritical mass. The weapon then explosively disassembled.

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