File:Site of First Self-Sustaining Nuclear Reaction (10585075464).jpg
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Original file (2,736 × 3,648 pixels, file size: 2.61 MB, MIME type: image/jpeg)
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Summary
| Description | Site of First Self-Sustaining Nuclear Reaction in Chicago, a national landmark (1942). The Chicago Pile-1 nuclear reactor was built under the abandoned Stagg Field at the University of Chicago. Overseen by Enrico Fermi and Leo Szilard, the "pile" consisted of graphite blocks moderating uranium pellets. Free neutrons produced by the natural decay of uranium were absorbed by other uranium atoms, creating fission and the release of more neutrons, a chain reaction. The graphite slowed the neutons, increasing the chance that they would be absorbed. On December 2, 1942, the pile went critical. The operation was terminated in February 1943 and moved to Red Gate Woods (now Argonne National Laboratory). |
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Site of First Self-Sustaining Nuclear Reaction
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| Author | Teemu008 from Palatine, Illinois |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This image, originally posted to Flickr, was reviewed on 8 November 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 04:50, 8 November 2013 | | 2,736 × 3,648 (2.61 MB) | File Upload Bot (Magnus Manske) | Transferred from Flickr by User:AlbertHerring |
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