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Radioisotopes in geology.

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View Resource Understanding Our Planet Through Chemistry

The Central Region's Mineral Resource Surveys Understanding Our Planet Through Chemistry Web site shows how chemists and geologists use analytical chemistry to determine the age of the Earth. The various topics covered include: elements, isotopes, and radioactivity; global change in the geologic past; cleaning up coal burning; and mapping stream sediments for resource exploration, among others....

https://minerals.cr.usgs.gov/gips/na/contents.html
View Resource Tritium/Helium-3 Dating

First, the USGS summarizes the use of tritium and helium-3 for dating geologically young groundwater (1). Researchers can find the conditions needed to solve the helium isotope mass balance as well as equations and corrections needed to obtain the age of water. The second website, provided by the Rosenstiel School of Marine and Atmospheric Sciences, discusses the presence of tritium and helium...

https://scout.wisc.edu/report/nsdl/ps/2005/0204#TopicInDepth