radiolabel

tr.v., -beled, or -belled, -bel·ing, or -bel·ling, -bels, or -bels.
To tag (a hormone, enzyme, or other substance) with a radioactive tracer.

n.
A radioactive isotope used as a tracer; a radiotracer.

(rā'dē-ō-lā'bəl)
v., -beled or ra·di·o·la·belled, -bel·ing or ra·di·o·la·bel·ling, -bels or ra·di·o·la·bels.

To tag a hormone, an enzyme, or other substance with a radiotracer.

n.

A radiotracer.

Incorporation of a radioactive element into a compound in order to investigate its metabolism, fate and utilization.