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| View Original: | "60-inch_cyclotron_at_the_University_of_California_Lawrence_Radiation_Laboratory,_Berkeley"_-_NARA_-_558594.tif (3000x2409) | |||
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| Keywords: "60-inch cyclotron at the University of California Lawrence Radiation Laboratory, Berkeley" - NARA - 558594.tif Scope and content 'Photograph shows the 60-inch cyclotron at the University of California Lawrence Radiation Laboratory Berkeley in August 1939 The machine was the most powerful atom-smasher in the world at the time It had started operating early in the year During the period of the photograph Dr Edwin M McMillan was doing the work which led to the discovery of neptunium element 93 a year later The instrument was used later by Dr Glenn T Seaborg and his colleagues for the discovery of element 94 plutonium early in 1941 Subsequently other transuranium elements were discovered with the machine as well as many radioisotopes including carbon-14 For their work Drs Seaborg and McMillan shared the Nobel Prize in 1951 The machine was used for the long bombardments which produced the first weighable and visible quantities of plutonium which was used at Chicago by Seaborg and his colleagues to work out the method for separating plutonium on an industrial scale at the Hanford Washington plutonium pro ' General notes 558594 Local identifier 434-RF-25 8 Department of Energy Office of Public Affairs 10/01/1977 - 1985 Still Picture Records Section Special Media Archives Services Division NWCS-S National Archives at College Park 8601 Adelphi Road College Park MD 20740-6001 1939 Record group Record Group 434 General Records of the Department of Energy 1915 - 2007 Record group ARC 722 Activities and Personnel of the Department of Energy and Predecessor Agencies compiled 1955 - 1979 Series ARC 558589 File unit File unit ARC Variant control numbers NAIL Control Number NWDNS-434-RF-25 8 yes Other versions NARA-cooperation PD-USGov Lawrence Berkeley National Laboratory Cyclotrons Neptunium Plutonium Electromagnets | ||||