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
Qian Sanqiang Vice-President of the Chinese Academy of Sciences and honorary Chairman of the China Association for Science and Technology. Qian made outstanding contributions to the establishment of nuclear science in the People's Republic of China and to the development of the PRC's atomic and hydrogen bombs. Qian Sanqiang Qian Sanqiang (; October 16, 1913 – June 28, 1992) was a Chinese nuclear physicist. Due to his central role in the development of China's nuclear industry and nuclear weapons program, he is referred to as China's "father of the atomic bomb." A native of Huzhou, Zhejiang Province, China, Qian was born in