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24-Sep-2020 16:32

To date a radioactive rock, geologists first measure the “sand grains” in the top glass bowl (the parent radioisotope, such as uranium-238 or potassium-40).

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You can click on any of the graphs to open a bigger version or you can click the link under the graph to download a pdf of the graph for printing!This is a general plot that works for any isotope system.