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Krypton is produced by cosmic rays bombarding the Earth and then stored in air bubbles trapped within Antarctic ice.
It has a radioactive isotope (krypton-81) that decays very slowly, and a stable isotope (krypton-83) that does not decay.
Comparing the proportion of stable-to-radioactive isotopes provides the age of the ice.
Though scientists have been interested in radiokrypton dating for more than four decades, krypton-81 atoms are so limited and difficult to count that it wasn’t until a 2011 breakthrough in detector technology that krypton-81 dating became feasible for this kind of research.
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Results of the discovery are being published this week in the Proceedings of the National Academy of Sciences. “The oldest ice found in drilled cores is around 800,000 years old and with this new technique we think we can look in other regions and successfully date polar ice back as far as 1.5 million years,” said Christo Buizert, a postdoctoral researcher at Oregon State University and lead author on the PNAS article.
The work was funded by the National Science Foundation and the U. “That is very exciting because a lot of interesting things happened with the Earth’s climate prior to 800,000 years ago that we currently cannot study in the ice core record.” Krypton dating is much like the more-heralded carbon-14 dating technique that measures the decay of a radioactive isotope – which has constant and well-known decay rates – and compares it to a stable isotope.
In cooperation with the material research group of Prof. Neumann, Gesellschaft für Schwerionenforschung-Darmstadt.(published) Joint development of a new confocal laser luminescence microscope to determine special resolved luminescence signal, Prof.
For decades, radiocarbon dating has been a way for scientists to get a rough picture of when once-living stuff lived.