Thin Man (nuclear bomb) Thin Man (nuclear bomb) "Thin Man" was the code name for a proposed plutonium gun-type nuclear bomb using plutonium-239 which the United States was developing during the Manhattan Project. They aborted its development when they discovered that the spontaneous fission rate of their nuclear reactor-bred plutonium was too high for use in a gun-type design, due to the high concentration of the isotope plutonium-240. In 1942, prior to the Army taking over wartime atomic research, Robert Oppenheimer held conferences in Chicago in June and Berkeley, California, in July at which various engineers and physicists discussed nuclear bomb design issues. A
Nagasaki National Peace Memorial Hall for the Atomic Bomb Victims Nagasaki National Peace Memorial Hall for the Atomic Bomb Victims The is a commemorative monument in Nagasaki, Japan, situated next to its Atomic Bomb Museum. The Peace Park is nearby. Like its counterpart in Hiroshima, the hall was constructed as a place to remember and pray for those killed by the 1945 atomic bombing, with photos, and memoirs and personal accounts of the event. It also offers information on international co-operation and exchange activities concerning medical treatment for sufferers of nuclear accidents. Designed by architect Akira Kuryu, the memorial was constructed between November 2000 and December 2002. The subterranean interior