radiotracer

[rey-dee-oh-trey-ser]
noun Chemistry.
a radioactive isotope used as a tracer.

Origin:
1945–50; radio- + tracer

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American Heritage
Medical Dictionary

radiotracer ra·di·o·trac·er (rā'dē-ō-trā'sər)
n.
A radioactive isotope used as tracer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If your gland collects too much or too little of the radiotracer, this can cause hypothyroidism or hyperthyroidism.
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