Operation Crossroads
There were only seven nuclear bombs in existence in July 1946. The two bombs used in the test were Fat Man plutonium implosion-type nuclear weapons of the kind dropped on Nagasaki. The "Able" bomb was stenciled with the name "Gilda" and decorated with an "Esquire" magazine photograph of Rita Hayworth, star of the 1946 movie, "Gilda". The "Baker" bomb was "Helen of Bikini." This femme-fatale theme for nuclear weapons, combining seduction and destruction, is epitomized by the use in all languages, starting in 1946, of "bikini" as the name for a woman's two-piece bathing suit.
History of Japan
However, on August 6, 1945, the US dropped an atomic bomb over Hiroshima, killing over 90,000 people. This was the first nuclear attack in history. On August 9 the Soviet Union declared war on Japan and invaded Manchukuo, and Nagasaki was struck by a second atomic bomb. The unconditional surrender of Japan was announced by Emperor Hirohito and communicated to the Allies on August 14, and broadcast on national radio on the following day, marking the end of Imperial Japan's ultranationalist ideology, and was a major turning point in Japanese history.