A radioactive isotope of iron, for example, 59Fe.

radioactive iron

Any of the radionuclides of iron, the most commonly used of which are beta- and gamma-emitting 59Fe, which has a half-life of 44.5 days, and 55Fe, which decays by electron capture and has a half-life of 2.74 years. 59Fe and 55Fe are not used clinically.


A radioactive isotope of iron; 55Fe and 59Fe are used in medical studies.
References in periodicals archive ?
Radioiron absorption in anemic dogs: fluctuations in the mucosal block and evidence for a gradient of absorption in the gastrointestinal tract.