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Lasers Date Ancient Groundwater

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Daniel S. Burgess

Using a laser-based isotopic analysis technique, geologists and physicists in the US, Switzerland and Egypt have determined that the water in Egypt's Nubian Aquifer is up to 1 million years old. The results reveal changes in the local climate over that time and suggest that the method is appropriate for dating other similarly ancient environmental samples. Neil C. Sturchio, a professor of earth and environmental sciences at the University of Illinois at Chicago, said that dating groundwater is important for scientific and practical reasons. It reveals how temporal changes in climate are...Read full article

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    Published: May 2004
    Glossary
    avalanche photodiode
    A device that utilizes avalanche multiplication of photocurrent by means of hole-electrons created by absorbed photons. When the device's reverse-bias voltage nears breakdown level, the hole-electron pairs collide with ions to create additional hole-electron pairs, thus achieving a signal gain.
    avalanche photodiodeBasic Sciencediode lasersgeologistsisotopic tracerslaser-based isotopic analysis techniquephysicistsResearch & TechnologyUniversity of IllinoisLasers

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