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The gaseous diffusion process, which enriches uranium for use in atomic energy activities, is done at AEC-owned, contractor-operated plants in Kentucky, Ohio, and Tennessee.
In the process, gaseous uranium hexafluoride (UF6) is put through a series of barriers, which partially separate the highly fissionable, lighter and faster-moving uranium-235 atoms from the heavier and slower-moving uranium-238 atoms that make up the bulk of the material, c. 1971. Original public domain image from Flickr
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