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They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in numbers of years. This is different to relative datingwhich only puts geological events in time order. These use radioactive minerals in rocks as geological clocks.
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Radiometric Age Dating Thermal ionization mass spectrometer used in radiometric dating. Radiometric dating calculates an age Rocl years for geologic materials by measuring the presence of a short-life radioactive element, e.