1944 May 9 The 50 milliwatt Water Boiler reactor goes critical at Los Alamos, NM. Holding 565 g of U-235 (in the form of 14.7% enriched uranyl sulfate), dissolved in a 12" sphere of water, this is the world's first reactor to use enriched uranium, and the first critical assembly constructed at Los Alamos. 1945 May 7 The 100-ton test is
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