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Project 58/58A
Operation Project 58/58A〔 was a series of 4 nuclear tests conducted by the United States in 1957-1958 at the Nevada Test Site. These tests followed the ''Operation Plumbbob'' series and preceded the ''Operation Hardtack I'' series.
All the tests in ''Project 58'' were one-point safety tests.〔(【引用サイトリンク】url=http://nuclearweaponarchive.org/Usa/Tests/Proj57-58.html )〕 They were intended to freeze device designs prior to full-scale tests at ''Operation Hardtack I''. No significant yield was expected from either, but the second, ''Coulomb-C'', a surface test conducted on December 9, produced an unanticipated yield of 500 tons. Shortly after detonation, fallout readings of fifty roentgens per hour were recorded on the Mercury Highway, and, as the cloud moved toward the southwest, personnel at Jackass Flats involved in construction for future nuclear rocket testing were forced to take cover. Eventually, the cloud reached the Los Angeles area where very low readings briefly caused some public concern.〔U.S. Department of Energy, ''Battlefield of the Cold War, The Nevada Test Site, Volume 1, Atmospheric Nuclear Weapons Testing, 1951-1963'', (DOE/MA-0003 )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Project 58/58A」の詳細全文を読む
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