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In early development of the casing for Fatman a practice/training bomb called a Pumpkin Bomb was developed. Inert versions were filled with cement, live ones were filled with Composition B (a predecessor to modern C-4) one of the two explosives used in the lenses in Fatman.

Composition B is a mixture of RDX and TNT in a wax binder.

Actual atomic bomb tests well into the 1950s continued to use Composition B as one of the explosives in their lenses until better explosives eventually replaced it.

A full answer to your question would require access to information that is still classified and would be redacted from any documents one was able to obtain via FOIA requests.

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11y ago

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