George Cowan was a physical chemist who joined the Manhattan Project in 1942. In this interview, Cowan discusses the Soviet atomic program and their effort to build a nuclear bomb. In 1949, he helped convince U.S. government officials that the radiochemistry of air samples taken from the atmosphere proved that the Soviets had detonated their own atomic bomb, rather than what many assumed was just a peaceful nuclear reactor problem. Cowan also discusses Operation Crossroads, where he helped take air samples during atomic tests at Eniwetok Atoll in 1946.
Tom Scolman arrived in Los Alamos shortly after receiving his PhD in physics from the University of Minnesota under renowned physicist Alfred Nier. At Los Alamos, Scolman worked in the Weapons Division where and a team of physicists helped assemble and test explosives that would be used in nuclear devices. After the war, Scolman worked for the Los Alamos National Laboratory and presided over hundreds of nuclear tests in the South Pacific, Nevada, and Amchitka. Scolman was also a member of a group that responded to weapons accidents; he recalls several instances where planes carrying nuclear weapons crashed but luckily did not explode.