Radiometric Age Dating - Geology (U.S. National Park Service)
https://www.nps.gov/subjects/geology/radiometric-age-dating.htm
WebOct 3, 2018 · Radiometric Age Dating. Thermal ionization mass spectrometer used in radiometric dating. Radiometric dating calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element, e.g., carbon-14, or a long-life radioactive element plus its decay product, e.g., potassium-14/argon-40.
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