Which radioactive isotope is used in biological dating

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In most cases, the information is used by physicians to make a quick, accurate diagnosis of the patient's illness.The thyroid, bones, heart, liver and many other organs can be easily imaged, and disorders in their function revealed.Many important properties of an isotope depend on its mass.The total number of neutrons and protons (symbol A), or mass number, of the nucleus gives approximately the mass measured on the so-called atomic- mass-unit (amu) scale.These electrons determine the chemistry of the atom.

When a combination of neutrons and protons, which does not already exist in nature, is produced artificially, the atom will be unstable and is called a radioactive isotope or radioisotope.An "isotopically labeled compound" has one or more of its atoms enriched in an isotope.Stable isotopes are tools used by researchers worldwide in the diagnosis of disease, to understand metabolic pathways in humans, and to answer fundamental questions in nature.A bar of pure uranium, for instance, would consist entirely of atoms with atomic number 92.The periodic table of the elements assigns one place to every atomic number, and each of these places is labeled with the common name of the element, as, for example, calcium, radon, or uranium.

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