radiolabel

[rey-dee-oh-ley-buh l] /ˌreɪ di oʊˈleɪ bəl/
verb (used with object), radiolabeled, radiolabeling or (especially British) radiolabelled, radiolabelling. Chemistry
1.
label (def 12).
Origin
1950-55; radio- + label
radiolabel in Medicine

radiolabel ra·di·o·la·bel (rā'dē-ō-lā'bəl)
v. ra·di·o·la·beled or ra·di·o·la·belled, ra·di·o·la·bel·ing or ra·di·o·la·bel·ling, ra·di·o·la·bels or ra·di·o·la·bels
To tag a hormone, an enzyme, or other substance with a radiotracer. n.
A radiotracer.