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A radioactive tracer, radiotracer, or radioactive label is a synthetic derivative of a natural compound in which one or more atoms have been replaced by a radionuclide (a radioactive atom). By virtue of its radioactive decay , it can be used to explore the mechanism of chemical reactions by tracing the path that the radioisotope follows from ...
These are the radiations that are picked up by a gamma camera when 99m Tc is used as a radioactive tracer for medical imaging. The remaining approximately 12% of 99m Tc decays are by means of internal conversion , resulting in ejection of high speed internal conversion electrons in several sharp peaks (as is typical of electrons from this type ...
Positron emission tomography (PET) [1] is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes, and in other physiological activities including blood flow, regional chemical composition, and absorption.
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For example, technetium-99m is a radioactive tracer that medical imaging equipment tracks in the human body. [ 21 ] [ 85 ] It is well suited to the role because it emits readily detectable 140 keV gamma rays , and its half-life is 6.01 hours (meaning that about 94% of it decays to technetium-99 in 24 hours). [ 28 ]
Radiopharmacology is radiochemistry applied to medicine and thus the pharmacology of radiopharmaceuticals (medicinal radiocompounds, that is, pharmaceutical drugs that are radioactive). Radiopharmaceuticals are used in the field of nuclear medicine as radioactive tracers in medical imaging and in therapy for many diseases (for example ...
Fluorine-18 is one of the early tracers used in positron emission tomography (PET), having been in use since the 1960s. [4] Its significance is due to both its short half-life and the emission of positrons when decaying.
Nuclear medicine physicians, also called nuclear radiologists or simply nucleologists, [1] [2] are medical specialists that use tracers, usually radiopharmaceuticals, for diagnosis and therapy. Nuclear medicine procedures are the major clinical applications of molecular imaging and molecular therapy.