The Manhattan Project
Research and Development Program to Produce the First Atomic Bomb



 
The Manhattan Project
Research and Development Program to Produce the First Atomic Bomb

 
The Manhattan Project was a U.S. government research project that produced the first atomic bomb. In 1939 U.S. scientists urged Pres. Franklin D. Roosevelt to establish a program to study the potential military use of fission.

By 1942 the project was code-named Manhattan, after the site of Columbia University, where much of the early research was done.

The first bomb was exploded in a test at Alamogordo air base in southern New Mexico.

By its end the project had cost some $2 billion (roughly equivalent to $24.4 billion today) and had involved over 130,000 people.

 

The Manhattan Project was a research and development program, led by the United States with participation from 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The Army component of the project was designated the Manhattan District; "Manhattan" gradually superseded the official codename, "Development of Substitute Materials", for the entire project.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 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 $24.4 billion as of 2011).

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.