Nier and uranium separation, 1950s

Nier and uranium separation, 1950s

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Nier and uranium separation. US physicist Alfred Otto Carl Nier (1911-1994) with a mounted display of the mass spectroscopy equipment he used in 1940 to obtain pure samples of uranium-235. Nier worked on mass spectroscopy. His work in the 1930s on isotopes of uranium was later used in measurements of the age of the Earth. During World War II, he was part of the Manhattan Project, helping to separate uranium isotopes and monitor uranium production for the first atomic bombs. He was elected a member of the National Academy of Sciences (1950). Photographed at the University of Minnesota in the 1950s.

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