Radioactive dating dictionary


14-Dec-2019 14:22

It is not affected by external factors such as temperature, pressure, chemical environment, or presence of a magnetic or electric field.The only exceptions are nuclides that decay by the process of electron capture, such as beryllium-7, strontium-85, and zirconium-89, whose decay rate may be affected by local electron density.Isotopic systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years (e.g., tritium) to over 100 billion years (e.g., samarium-147).For most radioactive nuclides, the half-life depends solely on nuclear properties and is essentially a constant.

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Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company.By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.Radiometric dating is also used to date archaeological materials, including ancient artifacts.The basic equation of radiometric dating requires that neither the parent nuclide nor the daughter product can enter or leave the material after its formation.

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The possible confounding effects of contamination of parent and daughter isotopes have to be considered, as do the effects of any loss or gain of such isotopes since the sample was created.Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.



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