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Beryllium 10 cosmogenic dating

Cosmogenic production at the earth's surface Si and mu-meson capture.The rate of this production is dependent on cosmic-ray flux, which increases with latitude and elevation.In fact, the metal, its alloys and salts should only be handled in accordance with specific work codes.Beryllium is also classified as a carcinogen by the International Agency for Research on Cancer and it can cause lung cancer in people who get exposed to beryllium on a daily basis because of their occupations that require them to mine or process the metal, said Dr.SED is now an established tool for geomorphology and landscape change studies.Surface exposure age dating requires intensive chemistry.Landform-evolution studies look at the build-up of long-lived radioisotopes produced on the surface of the earth (i.e., Be has also been measured to determine erosion rates and fluvial transport mechanisms (Dominik et al., 1987) and to determine direct contribution of rainfall to terrestrial waters (Cooper et al., 1991). de Vries, Environmental Isotopes in the Hydrological Cycle: Principles and Applications, vol. Hovius, Quantification of Continental Erosion Processes.

So-called ‘inherited’ Be from earlier exposure invalidate a single age determination, but there are ways to check for ‘prior exposure’ for example by measurement on another cosmogenic isotope, utilising the difference in half-lives. Denudation processes in an agricultural watershed (Cayagua´s River Basin, Puerto Rico) and a matched undisturbed watershed (Icacos River Basin) were compared using 10Be concentrations in quartz for various size fractions of bed material. This confirms the recent and presumably anthropogenic origin of the modern high denudation rate in the Cayaguás Basin and suggests that pre-agricultural erosional conditions were comparable to those of the present-day Icacos. We present a simple approach to estimate predevelopment denudation rates using in-situ-produced cosmogenic 10Be in fluvial sediments. The 10Be concentration of a discharge-weighted average of size classes of river sediment corresponds to a long-term average denudation of = 43 m Ma^-1, consistent with mass balance results. Fine material from old shallow soils contributes little, however, to the present-day sediment output of the Cayaguás.Because quartz does not absorb radionuclides from precipitation, the "exposure age," or the length of time present at the surface of the earth may be effectively determined by Be produced in the upper atmosphere from that produced in situ through interaction with rocks and soils.(See Paul Bierson's guidelines for the Cosmogenic Nuclide Extraction Lab at the University of Vermont for a detailed description of sample preparation techniques for Be produced in situ also is increasingly being shown to also be useful for dating sediments in studies that examine basin-scale rates of denudation (Bierman et al., 1998).Cosmogenic production in the upper atmosphere Be (half-life of 53 days) are continuously produced in the atmosphere by the high-energy proton component in cosmic radiation, causing spallation of atmospheric oxygen and nitrogen atoms.Beryllium is rapidly washed from the atmosphere by precipitation, and is subsequently incorporated in continental and marine sediments. Records of cosmogenic radionuclides be-10, al-26 and cl-36 in corals: First studies on coral erosion rates and potential of dating very old corals. This confirms the recent and presumably anthropogenic origin of the modern high denudation rate in the Cayagua´s Basin and suggests that pre-agricultural erosional conditions were comparable to those of the present-day Icacos. We present results of measurements of cosmogenic 10Be, 26Al and 36Cl, and the indigenous (intrinsic) concentrations of the stable elements Be, Al and Cl in 120–200 kyr old corals from Barbados and Puerto Rico. Be, the only stable isotope of beryllium, occurs naturally on earth.However, for a light isotope the abundance of beryllium in the solar system is anomalously low.

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  1. Beryllium-10 10 Be. Cosmogenic 10 Be thereby accumulates at the soil surface, where its relatively long half-life. Surface exposure dating;

  2. Title Surface exposure cosmogenic nuclide dating Author Kerry J. Cupit, Department of Earth Sciences. Beryllium-10 v Aluminium-26 vi Chlorine-36

  3. Beryllium-10 terrestrial cosmogenic nuclide surface exposure dating of Quaternary landforms in Death Valley Lewis A. Owena,⁎, Kurt L. Frankelb, Jeffrey R. Knottc.

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