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A radioactive tracer, also called a radioactive label, is a substance containing a radioisotope. Tracers can be used to measure the speed of chemical processes and to track the movement of a substance through a natural system. Radioactive tracing was developed by George de Hevesy.

The tracers are applied in autoradiography, nuclear medicine, including single photon emission computed tomography (SPECT), and positron emission tomography.

Types of tracer used in nervous system studies[]

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de:Tracer (Nuklearmedizin)
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