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Upshot-Knothole Encore : ウィキペディア英語版 | Upshot-Knothole Encore
Upshot-Knothole Encore was a nuclear weapons test conducted by the United States as part of Operation Upshot-Knothole. It took place on May 8, 1953 in Yucca Flat, in the Nevada Test Site.〔U.S. Department of Energy / Nevada Operations Office, ''United States Nuclear Tests - July 1945 through September 1992'', December 2000, (DOE/NV-209 Rev 15 )〕 ==Test location== The test device, codenamed ''Encore'', was detonated at 8:30 local time by performing an airdrop of a Mk-6D bomb from 19,000 feet with a B-50 Superfortress over Area 5 at the Nevada Test Site. At 2,423 feet, the bomb detonated, although it was fifteen feet west and nine hundred and thirty seven feet south of its designated target. The estimated yield of the weapon was 30-36 kilotons, although it yielded twenty-seven kilotons. In the codename "Encore", the letter "E" was a reference to the "effects" of weapons testing.〔(【引用サイトリンク】url=http://www.nuclearweaponarchive.org/Usa/Tests/Upshotk.html )〕
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