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U-Pb and Th-Pb dating of apatite by LA-ICPMS

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(PDF) U-Pb and Th-Pb dating of apatite by LA-ICPMS | David Chew -

How old are you? How old are your grandparents? Do you know how old Canada is? Or the pyramids in Egypt? Do you know how old Earth is? How do scientists even know how old the Earth is?
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Uranium–lead dating

Special issue: In situ carbonate U—Pb geochronology. Research article 09 Apr Roberts nirob bgs.
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Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable. Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence. Uranium comes in two common isotopes with atomic weights of and we'll call them U and U.
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