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Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.A particular isotope of a particular element is called a nuclide. That is, at some point in time, an atom of such a nuclide will undergo radioactive decay and spontaneously transform into a different nuclide.Ice outcrops provide accessible archives of old ice but are difficult to date reliably.Here we demonstrate Kr radiometric dating of ice, allowing accurate dating of up to 1.5 million-year-old ice.Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.

This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present.The Kr radiometric ages agree with independent age estimates obtained from stratigraphic dating techniques with a mean absolute age offset of 6 ± 2.5 ka.Our experimental methods and sampling strategy are validated by (Kr ages due to past geomagnetic variability to be below 3 ka.The technique successfully identifies valuable ice from the previous interglacial period at Taylor Glacier, Antarctica.Our method will enhance the scientific value of outcropping sites as archives of old ice needed for paleoclimatic reconstructions and can aid efforts to extend the ice core record further back in time. Krypton was extracted from the air bubbles in four ∼350-kg polar ice samples from Taylor Glacier in the Mc Murdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA).

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