Krypton-81 isotope can help map underground waterways

Cataloguing underground waterways, some of which extend for thousands of miles, has always been difficult—but scientists at the U.S. Department of Energy’s (DOE) Argonne National Laboratory, with colleagues from the University of Illinois at Chicago and the International Atomic Energy Agency, are mapping them with some unusual equipment: lasers and a rare isotope.

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Krypton-81 isotope can help map underground waterways