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tracer (trās´әr) a means or agent by which certain substances or structures can be identified or followed, as a radioactive tracer. a mechanical device by which the outline of an object or the direction and extent of movement of a part may be graphically recorded; see also tracing. a dissecting instrument for isolating vessels and nerves. radioactive tracer
a radioactive isotope replacing a stable chemical element in a compound (said to be radiolabeled) and so able to be followed or tracked through one or more reactions or systems by means of a radiation detector; used especially
for such a compound that is introduced into the body for study of the compound's metabolism, distribution, and passage through
the body.
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