. How are radioisotopes useful in the medical field? Briefly describe, giving specific examples. 

Radioisotopes are valuable tools in the medical field due to their ability to emit radiation, which can be harnessed for various diagnostic and therapeutic purposes. Here are some specific examples of how radioisotopes are useful in medicine:

1. Diagnostic Imaging: Radioisotopes are commonly used in medical imaging techniques like positron emission tomography (PET) and single-photon emission computed tomography (SPECT). In PET scans, a radioactive tracer, often fluorine-18, is introduced into the body. As it decays, it emits positrons that interact ______ _______ _______ ___ _________.
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