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A radioactive isotope of chromium. The half-life is 27.7 days. Red blood cells are labeled with this isotope in order to study their length of life in the body.


a chemical element, atomic number 24, atomic weight 51.996, symbol Cr. See Table 6.

a radioisotope of chromium having a half-life of 27.8 days; used to label red blood cells to determine red cell volume and red cell survival time. Symbol 51Cr. See also cr51edta.
chromium nutritional deficiency
possibly causally related to the onset of diabetes mellitus in primates.
chromium trioxide
possibly carcinogenic in humans. See also chromate.