| 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, and for the diagnosis of gastrointestinal bleeding, and is used to label platelets to study their survival. It has also been used to label human serum albumin for measurements of gastrointestinal protein loss.
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