Manhattan Project

The Manhattan Project was a research and development program by the United States with the United Kingdom and Canada that produced the first atomic bomb during World War II. From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the US Army Corps of Engineers. The Army component of the project was designated the Manhattan District; "Manhattan" gradually superseded the official codename, "Development of Substitute Materials", for the entire project. Along the way, the Manhattan Project absorbed its earlier British counterpart, Tube Alloys.

The Manhattan Project began modestly in 1939, but grew to employ more than 130,000 people and cost nearly US$2 billion (roughly equivalent to $25.8 billion as of 2012). Over 90% of the cost was for building factories and producing the fissionable materials, with less than 10% for development and production of the weapons. Research and production took place at more than 30 sites, some secret, across the United States, the United Kingdom and Canada. Two types of atomic bomb were developed during the war. A relatively simple gun-type fission weapon was made using uranium-235, an isotope that makes up only 0.7 percent of natural uranium. Since it is chemically identical to the main isotope, uranium-238, and has almost the same mass, it proved difficult to separate. Three methods were employed for uranium enrichment: electromagnetic, gaseous and thermal. Most of this work was performed at Oak Ridge, Tennessee.

In parallel with the work on uranium was an effort to produce plutonium. Reactors were constructed at Hanford, Washington, in which uranium was irradiated and transmuted into plutonium. The plutonium was then chemically separated from the uranium. The gun-type design proved impractical to use with plutonium so a more complex implosion-type weapon was developed in a concerted design and construction effort at the project's weapons research and design laboratory in Los Alamos, New Mexico. The first nuclear device ever detonated was an implosion-type bomb at the Trinity test, conducted at New Mexico's Alamogordo Bombing and Gunnery Range on 16 July 1945. Little Boy, a gun-type weapon, and the implosion-type Fat Man were used in the atomic bombings of Hiroshima and Nagasaki, respectively.

The Manhattan Project operated under a blanket of tight security, but Soviet atomic spies still penetrated the program. It was also charged with gathering intelligence on the German nuclear energy project. Through Operation Alsos, Manhattan Project personnel served in Europe, sometimes behind enemy lines, where they gathered nuclear materials and rounded up German scientists. In the immediate postwar years the Manhattan Project conducted weapons testing at Bikini Atoll as part of Operation Crossroads, developed new weapons, promoted the development of the network of national laboratories, supported medical research into radiology and laid the foundations for the nuclear navy. It maintained control over American atomic weapons research and production until the formation of the United States Atomic Energy Commission in January 1947.

Read more about Manhattan ProjectOrigins, Plutonium, Personnel, Foreign Intelligence, After The War, Cost, Legacy

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Charles D. Coryell
... In 1942 he accepted a position in the Manhattan Project, for which he was Chief of the Fission Products Section, both at the University of Chicago (1942–1946) and at Clinton ... Coryell was among the Manhattan Project scientists who in 1945 signed the Szilárd petition urging President Harry S ... was co-editor of Radiochemical Studies The Fission Projects, a volume of 336 research papers from the Manhattan Project ...
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... wartime research group that would become known as the Manhattan Engineering District Project ... Eastman (whose deteriorating health forced him to withdraw from the project soon after work had begun), Brewer headed a group composed of Leroy Bromley, Paul Gilles and Norman Lofgren, assigned with the ...
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... has created several books dealing with the Manhattan Project ... They are Oppenheimer and the Manhattan Project — Edited by Cynthia Kelly, this book provides a spectrum of interpretations of J ... Remembering the Manhattan Project — Edited by Cynthia Kelly, part I of this book, comprising papers from the Atomic Heritage Foundation's Symposium on ...
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... Actor Role Episode Lindsay Lohan Kimmie Keegan "The Manhattan Project", "Granny Pants", "Ugly Berry" Regis Philbin Himself "The Manhattan Project ...
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... "Atomic Age", became the official correspondent for the Manhattan Project in spring 1945 ... The wartime Manhattan Project left a legacy in the form of the network of national laboratories the Lawrence Berkeley National Laboratory, Los Alamos National ... power for warship propulsion, and sought to create its own nuclear project ...

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