Operation Ivy KING, 1952


Operation Ivy was the eighth series of American nuclear tests. Its purpose was to help upgrade the arsenal of nuclear weapons in response to the Soviet nuclear weapons program. The two explosions were staged in late 1952 at Eniwetok Atoll in the Pacific Proving Ground in the Marshall Islands. The second test, King, fired the largest nuclear weapon to date using only nuclear fission (no fusion nor fusion boosting). This "Super Oralloy Bomb" was intended as a backup if the fusion weapon failed. King yielded 500 kilotons, 25 times more powerful than the Fat Man weapon. During the Manhattan Project enriched uranium was given the codename oralloy, a shortened version of Oak Ridge alloy. Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation.


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