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THE URANIUM PATH TO THE BOMB (1942-1944)
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The Uranium Path to the Bomb, 1942-1944
The uranium path to the atomic bomb ran through
Oak Ridge, Tennessee. Only if the
new plants built at Oak Ridge produced enough enriched
uranium-235 would a uranium bomb be possible.
General Groves placed two methods into production: 1)
electromagnetic, based on the principle that charged
particles of the lighter isotope would be deflected more
when passing through a magnetic field; and 2) gaseous
diffusion, based on the principle that molecules of the
lighter isotope, uranium-235, would pass more readily
through a porous barrier. Full-scale electromagnetic
and gaseous diffusion production plants were built at Oak
Ridge at sites designated as
"Y-12" and
"K-25", respectively.
Both the Y-12 and K-25 plants converted new and untried
laboratory technologies directly to large-scale production
processes. At Y-12, the
design continuously changed even as
construction was ongoing. Once
built, the Y-12 Alpha and Beta "racetracks" went
into full operation only slowly, as
numerous unanticipated design and equipment problems were
encountered. Originally expected to provide most of
the uranium-235 requirements, the
K-25 gaseous diffusion plant, due to
difficulties in fabricating a suitable barrier, was cut
back to a feeder process for Y-12 in the summer of
1943. The eventually-successful operations at both
Y-12 and K-25, however, remained very much in doubt well
into 1944. For this reason, the Army, with assistance from
the Navy, also implemented the
liquid thermal diffusion method of
uranium enrichment, in which the lighter isotope
concentrated near a heat source within a tall column, at
the S-50 plant on the K-25 site as a
supplement and a backup. In the end, it took the
combined efforts of all three of these facilities to
produce enough enriched uranium for the one and only
uranium atomic bomb produced during the war.
To learn more about any of these events associated with
the uranium path to the bomb, choose a web page from the
menu below. To continue with a quick overview of the
Manhattan Project, jump ahead to the description of the
"Plutonium Path to the Bomb, 1942-1944."
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Sources and notes for this page.
The text for this page is original to the Department of
Energy's
Office of History and Heritage Resources. Portions were adapted or taken directly from
the History Office publications:
Terrence R. Fehner and F. G. Gosling,
Origins of the Nevada Test Site (DOE/MA-0518;
Washington: History Division, Department of Energy,
December 2000), 26, and Richard G. Hewlett and Oscar E. Anderson,
Jr., The New World, 1939-1946: Volume I,
A History of the United States
Atomic Energy Commission
(Washington: U.S. Atomic Energy Commission, 1972),
167. Click
here for more information on the picture of the
Alpha racetrack at Y-12. The photograph of K-25 is courtesy the
Federation of American Scientists. The aerial photograph showing S-50, the power plant
for K-25, and the Clinch River, is
reproduced in the History Office publication: Richard G.
Hewlett and Oscar E. Anderson, Jr.,
The New World, 1939-1946, between pages 296 and
297.
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