Title Y-12 Calutron Operators Subject Uranium enrichment Manhattan Project (U.S.) Calutron Description Calutron Operators monitored various components of the machine used to separate isotopes of uranium. Calutron operators were predominately female and worked in shifts 24 hours a day. Creator Records of the Atomic Energy Commission, Record Group 326 Source Formerly Classified Correspondence Files, 1942-1947 Date ca. 1944 Rights National Archives at Atlanta Format Still Image Language English Identifier ARC Identifier 1518690