Radiology: The branch of the health sciences dealing with radioactive substances and radiant energy and with the diagnosis and treatment of disease by means of both ionizing (e.g., x-rays) and nonionizing (e.g., ultrasound)
Radioisotope: An isotope, which is radioactive; one having an unstable nucleus and emitting characteristic radiation during its decay to a stable form. Radioisotopes have important diagnostic and therapeutic uses in clinical medicine
Radioactivity: The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83, and possible of induction in all other known elements.
Half-life: The time required for the decay of half of a sample of particles of a radionuclide or elementary particle.
Biological half-life: The time required for a living tissue, organ, or organism to eliminate one half of a radioactive substance, which has been introduced into it.
Radiation: Energy transmitted by waves through space or through some medium; usually referring to electromagnetic radiation when used without a modifier
Gamma camera: A scanner that detects the movement of a radiopharmaceutical, emitting gamma radiation during itís movement through the human body.
Radiopharmaceutical: a radioactive pharmaceutical, nuclide, or other chemical used for diagnostic or therapeutic purposes.
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