radioactive tracer(redirected from Radioactive labeling)
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radioactive tracer[¦rād·ē·ō′ak·tiv ′trā·sər]
A radioactive isotope which, when attached to a chemically similar substance or injected into a biological or physical system, can be traced by radiation detection devices, permitting determination of the distribution or location of the substance to which it is attached. Also known as radiotracer.