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How is radioactive dating performed

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About

How is radioactive dating performed?

Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus. A particular isotope of a particular element is called a nuclide. Some nuclides are inherently unstable.

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Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic. Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes. Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. Radiometric Dating The aging process in human beings is easy to see.

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Radiometric Dating Click image Introduction: An atom is usually comprised of a nucleus of protons having a mass and a positive charge and neutrons having a slightly larger mass and no charge with electrons having a negligible mass and a negative charge. Each atom has an atomic number which is the same as the number of protons in its nucleus: All atoms of the same element have the same number of protons in the nucleus, but some may have different numbers of neutrons in the nucleus and are called isotopes. For instance, the isotopes of hydrogen are: Some isotopes are unstable and will sooner or later break up into smaller pieces radioactive decay.

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Radiometric Dating: Methods, Uses & the Significance of Half-Life

If we know the number of radioactive parent atoms present when a rock formed and the number present now, we can calculate the age of the rock using the decay constant. The number of parent atoms originally present is simply the number present now plus the number of daughter atoms formed by the decay, both of which are quantities that can be measured. Samples for dating are selected carefully to avoid those that are altered, contaminated, or disturbed by later heating or chemical events. In addition to the ages of Earth, Moon, and meteorites, radiometric dating has been used to determine ages of fossils, including early man, timing of glaciations, ages of mineral deposits, recurrence rates of earthquakes and volcanic eruptions, the history of reversals of Earth's magnetic field, and the age and duration of a wide variety of other geological events and processes.

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