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April 9, 1960

Atomic Energy Commission, 'Gas Centrifuge Method of Isotope Separation,' AEC 610/15

Having read the Union Carbide and General Electric reports on gas centrifuges, and taking into account West Germany and The Netherlands’ unwillingness to classify their programs, the AEC looks into other courses of action, including collaboration with the other two nations and even declassifying their own program.

March 23, 1960

Philip J. Farley, special Assistant to the Secretary of State, to Algie A. Wells, Director, Division of International Affairs, Atomic Energy Commission, 'Control of and Cooperation in Gas Centrifuge Research and Development Program'

As West Germany and The Netherlands developed ultra-centrifuges without a classification policy, the AEC discuss ways to keep the technology under wraps without arousing suspicion from the other members of Euratom.

February 26, 1960

S.A. Levin, D. E. Hatch, and E. Von Halle, 'Production of Enriched Uranium for Nuclear Weapons by Nations X, Y, and Z by Means of the Gas Centrifuge Process,' Operations Analysis Division, Union Carbide Nuclear Company

A Union Carbide Nuclear Company study to determine how quickly and easily foreign countries could develop and utilize gas centrifuges with the goal of creating nuclear weapon facilities. The study determines that, due to the cheap cost and relatively small size of the centrifuges, even un-industrialized countries such as Cuba could achieve this technology within 8 years if helped by a larger nation.

November 1, 1978

'UK Approach to Supplier Governments on Pakistan,' State Department cable 278247 to US Embassy Bonn et al.

Summary of a British report on problems with the export "trigger list" of the Nuclear Suppliers Group. The list did not include gray area items that could be used in building nuclear facilities. To begin correcting the problem, the British announced a ban of inverter exports and asked other governments to take parallel steps. Also includes a summary of a secret British paper on Pakistan nuclear intentions. The British believed that the “piecemeal” Pakistani purchasing efforts to acquire inverters were directly related to the building of a gas centrifuge unit for producing weapons-grade uranium. Attached to the cable is a 7 November "Memorandum for the Record" discussing sharing this information with the Department of Energy.