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Rosalyn Yalow (1921-2011, nee Sussman), US medical physicist. Yalow trained as a physicist and worked in nuclear medicine, following her special interest in radioisotopes. In the 1950s she worked with US physician Solomon Berson in a New York hospital, developing the method of radioimmunoassay (RIA) for the detection of hormones. RIA detects the presence of molecules by binding them to a radioactively-labelled counterpart. The technique can be used to find any substance for which an antibody is makeable. Yalow shared the 1977 Nobel Prize in Physiology or Medicine 'for the development of radioimmunoassays of peptide hormones'.
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