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The "implosion" design was considered top-secret in the United States until it was declassified and released during the testimony of David Greenglass again Julius and Ethel Rosenberg in 1951. Photographs of the casings of "Little Boy" and "Fat atomic bombings of hiroshima and nagasaki 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 atomic bombings of hiroshima and nagasaki and extremely delicate. It was eventually re-worked in the MK 4 Fat Man bomb, which was similar in atomic bombings of hiroshima and nagasaki principle but was 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). Schematic cross-section of the "gadget"; some boundaries are approximate.
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