National Museum of Nuclear Science & History
Robert Lee Walker was an American physicist. Walker was born in 1919 in Saint Louis. He received a B.
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.
