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  • Radioactive substances intended for use during various diagnostic procedures. These substances are typically pharmacologically inert compounds that are taken up preferentially by certain tissues and incorporate atoms with unstable nuclei that exhibit spontaneous decay resulting in release of radiation (i.e., radionuclides). Radionuclides incorporated in radiopharmaceuticals are typically short-lived with a half-life measured in hours or days. Radionuclides used in diagnostic procedures are typically gamma emitters or positron emitters, which are detected by gamma cameras/probes or positron emission tomography scanning systems, respectively.
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