Yeah... In fact, there is a test called the Urea Breath Test
when patients are supposed to drink it, but one of its atom is
radioactively labelled... When it is taken in by the patient, the
bacteria (H pylori) in the stomach will break the compound down
into carbon dioxide and ammonia... the person will then blow into a
reagent in a test tube, and if the radioactive compound is present
(13C), it will change the color of the reagent...
