| http://www.w3.org/ns/prov#value | - Directly after their synthesis, the PET radiotracers already begin to decay and release positrons in the process. (Because the radiotracers used for PET generally decay very rapidly, PET is an extremely expensive procedure available only at selected facilities with or near cyclotrons.) Small amounts of the radiotracer are injected into the subject???s bloodstream, which distributes the tracer to t
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