A radioactive marker is a radioactive isotope who "labelled" a compound, used for the study of a chemical reaction, a physiological process, an industrial process, geochemical and hydrochemical phenomenons and many others.
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A radioactive marker is a molecule that contains a radioactive atom, such as carbon-14 or iodine-125. When the marker is introduced into a biological system, the radiation emitted by the radioactive atom can be detected using specialized equipment like a Geiger counter or a scintillation counter. By tracking the movement and accumulation of the marker in tissues or cells, researchers can study processes such as metabolism, protein synthesis, or cell migration.
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Rocks in general are not dated, but a fossil would be.
Alloys
All uranium compounds are radioactive to some degree.
Lightning conductors do not contain radioactive compounds. They are typically made of metal, such as copper or aluminum, and work by providing a path of least resistance for the lightning strike to follow, directing the electrical discharge safely into the ground. There is no need for radioactive materials in a lightning conductor.