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 Atomic Bomb Museum Nagasaki Atomic Bomb Museum The is in the city of Nagasaki, Japan. The museum is a remembrance to the atomic bombing of Nagasaki by the United States of America 9 August 1945 at 11:02:35 am. Next to the museum is the Nagasaki National Peace Memorial Hall for the Atomic Bomb Victims, built in 2003. The bombing marked a new era in war, making Nagasaki a symbolic location for a memorial. The counterpart in Hiroshima is the Hiroshima Peace Memorial Museum. These locations symbolize the nuclear age, remind visitors of the vast destruction and indiscriminate death caused by nuclear weapons, and