Wiktionary
radioactively
adv. 1 Using a radioactive substance 2 Concerning radioactivity
WordNet
radioactively
adv. in a radioactive manner; "radioactively labeled"
Usage examples of "radioactively".
I have said (in Chapter 2) that one can calculate the rate of protein synthesis by injecting a radioactively labelled amino acid into the bloodstream and measuring the amount of radioactivity to be found in the protein of particular brain regions after a given time.