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National Museum of Nuclear Science & History

L. P. Riordan

Project StaffX-10 Graphite Reactor

Oak Ridge, TN
Manhattan Project VeteranProject Worker/Staff
The X-10 Graphite Reactor at Oak Ridge

L. P. Riordan worked for Clinton Laboratories at the X-10 Reactor.

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Herbert M. Parker

Research & Development/300 Area

Herbert M. Parker (1910-1984) was a British-American medical physicist. He worked at Chicago, Oak Ridge, and Hanford during the Manhattan Project, and is perhaps best known for inventing the rep (a precursor of the rad) and helping develop the rem to measure radiation dosage.