Radiometric dating mass spectrometer

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Principles of isotopic dating

Most of the chronometric dating methods in use today are radiometric. That is to say, they are based on knowledge of the rate at which certain radioactive isotopes within dating samples decay or the rate of other cumulative changes in atoms resulting from radioactivity. Isotopes are specific forms of elements. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number.

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Transcript

Accelerator Mass Spectrometry AMS is a technique for measuring the concentrations of rare isotopes that cannot be detected with conventional mass spectrometers. The original, and best known, application of AMS is radiocarbon dating, where you are trying to detect the rare isotope 14 C in the presence of the much more abundant isotopes 12 C and 13 C. The natural abundance of 14 C is about one 14 C atom per trillion 10 12 atoms of 12 C. A nuclear particle accelerator consists essentially of two linear accelerators joined end-to-end, with the join section called the terminal charged to a very high positive potential 3 million volts or higher.

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