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Office of Environmental Management
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Office of Environmental Management
July 1946

The Atomic Energy Act was passed, establishing the Atomic Energy Commission (AEC). The AEC replaced the Manhattan Project on December 31, 1946. During the first half of 1946, the Congress debated whether atomic energy should be under civilian or military control. Civilian control won. The Act placed further development of nuclear technology under civilian rather than military control. Senator McMahon, the author of the Act, also known as the McMahon Act, called it "a radical piece of legislation" because it gave the AEC a monopoly over both military and commercial uses of atomic energy. The Act said atomic energy should be directed "toward improving public welfare, increasing the standard of living, strengthening free competition among private enterprises ... and cementing world peace." However, the Act prohibited private companies or individuals from owning nuclear materials and patenting inventions related to atomic energy. The Act also restricted information on using nuclear materials to produce energy as well as on designing, making, and using atomic weapons.

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