University of Chicago Centennial Cataloguesback
Franck's security pass

University of Chicago, security pass, November 19, 1942.

Shortly before Enrico Fermi conducted the first controlled, self-sustaining nuclear chain reaction, Franck reluctantly joined the Manhattan Project. Appointed head of the chemical laboratory that worked with "actinades," including the new man-made plutonium, Franck left the project before the war ended.