Cosmogenic nuclide dating who is bill hemmer dating

Clay is now completing a Masters degree in Applied Geomorphology. Ages were determined at two hominid localities from the Chad Basin in the Djurab Desert (Northern Chad).High-energy cosmic rays shower the Earth's surface, penetrating meters into rock and producing long-lived radionuclides such as Cl-36, Al-26 and Be-10.Production rates are almost unimaginably small - a few atoms per gram of rock per year - yet we can detect and count these "cosmogenic isotopes" using accelerator mass spectrometry, down to levels of a few thousand atoms per gram (parts per billion of parts per billion! The build-up of cosmogenic isotopes through time provides us with a way to measure exposure ages for rock surfaces such as fault scarps, lava flows and glacial pavements.These simulations provide a cost effective method for exploring characteristics of the radiation cascade that have been difficult or impossible to measure in detail (such as the angular distribution and energy spectrum of the neutron flux) .This characterization of the radiation is part of a physics-based complement to geological calibration of cosmogenic nuclide production rates, and should lead to better production rate estimates and better correction procedures for exposure dating and erosion-rate measurements.

Clay Johnson Former ESS undergraduate and lab assistant Currently I am pursuing a BS degree in Earth and Space Sciences while working with the Cosmogenic Isotope Group.

I hope to shed light on the spatial patterns of landscape change beneath icesheets and explore novel applications of cosmic ray-produced isotopes to understand earth surface processes.

Currently I am working on several projects relating to cosmogenic nuclides.

(iii) Developing methods to recover complex exposure-erosion histories and paleo-altitude from depth profiles and multiple-nuclide measurements.

During the weeks it takes to complete simulations, Dave is occasionally found brewing beer for departmental parties or building up his photography portfolio [surely "reading the physics and geology literature, completing papers and assisting with labwork"? Danielle Lemmon Undergrad student, chemist and mineralogist Danielle is really a physicist, but returns to the group each summer for new adventures in geology.

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