S-50 (left) and K-25 powerplant (right) - Courtesy of the Department of Energy
March 1945
The S-50 thermal diffusion plant at Oak Ridge begins operation with all 2100 columns. Regular weekly shipments of U-235 are now sent to Los Alamos with enrichments of 89%. By July, 50 kg had been received by Los Alamos, enough for Little Boy. By November enough uranium would be available for a second gun assembly device.

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Exterior view of S-50 themal diffusion facility - Courtesy of the Department of Energy

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