chromium 51

chromium 51
a radioactive isotope of chromium, atomic mass 51, having a half-life of 27.7 days; it decays by electron capture, emitting gamma rays (0.32 MeV), and is used to label red blood cells for measurement of red cell mass or volume, survival time, and sequestration studies; for the diagnosis of gastrointestinal bleeding; and to label platelets to study their survival. It has also been used to label human serum albumin for measurements of gastrointestinal protein loss.

Medical dictionary. 2011.

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