radiotracer

A radiotracer (or radioactive tracer, or radioactive label) is a substance containing a radioisotope that is used to measure the speed of chemical processes and to track the movement of a substance through a natural system such as a cell or tissue.  A number of different radioactive forms of hydrogen, carbon, phosphorus, sulfur, and iodine are commonly used in applications including biochemical assays, metabolism studies, and medical diagnostics.
Source: Wikipedia
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Variants

  • radioactive tracer
  • radiotracers