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The "implosion" design was considered top-secret in the United States until it was declassified box and released during the testimony of David Greenglass against Ethel and Julius Rosenberg in 1951. Photographs of the casings of "Little Boy" and "Fat Man" were not released publicly until the 1960s. The United States produced a small stockpile of "Fat Man" bombs after the war, but they were highly idiosyncratic and box extremely delicate. It was eventually re-worked in the MK 4 Fat Man bomb, which was similar in principle but was box appropriate for long-term stockpiling, use by non-experts, and used a more efficient implosion system (with a 60 point implosion system, compared to the 32 point weapon used in the war). [edit] The Gadget Schematic cross-section of the "gadget"; some boundaries are approximate. From left to right (outside inward): dural casing, ~140 cm inner diameter exploding-bridgewire detonator (allows for instantaneous detonation of explosives) faster explosive, Composition-B; 60% RDX, 39% TNT, 1% wax slower explosive (Baratol) faster explosive, "amplifier" aluminum–boron "pusher" (absorbs stray neutrons and widens/smooths implosion pulse) natural-uranium "tamper" (neutron reflector, inertial containment, improves efficiency, reduces the amount of fission material needed) the "pit"; plutonium-239–plutonium-240–gallium
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