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This suggests that the predominantly bedrock hillslopes erode very slowly and sediment is transferred very gradually in most regions within Death Valley.Comparisons of Be TCN ages within sample sets on individual surfaces most closely approximate to the age of landforms that are younger than ~ 70 ka.With the accuracy of modern instruments general every surface older than about 1000 years can be dated and the uncertainty limits today lie below 10% of the age.In NGU's projects on unstable rock slopes in Norway, TCN dating is used to date 1) rock-avalanche deposits and 2) sliding surfaces.

The basic principle is that these radionuclides are produced at a known rate, and also decay at a known rate.Auch die Anwendbarkeit der Chlor-Methode ist Abhängig von der Genauigkeit der Bestimmung des Ausgangsverhältnisses der beiden Isotope. Altersbestimmungen von jungen vulkanischen Gesteinen von mehreren hundert bis zu mehreren Millionen Jahren sind möglich.Surface exposure dating using terrestrial cosmogenic nuclides (TCN) is an established and reliable method to date landforms and has been applied for dating glacial advances and retreats, erosion history, lava flows, meteorite impacts, fault scarps, and other geological events.However, certain work activities can give rise to significantly enhanced exposures that may need to be controlled by regulation.Material giving rise to these enhanced exposures has become known as naturally occurring radioactive material (NORM).When one of these particles strikes an atom it can dislodge protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.In rock and other materials of similar density, most of the cosmic ray flux is absorbed within the first meter of exposed material in reactions that produce new isotopes called cosmogenic nuclides.Accordingly, by measuring the concentration of these cosmogenic nuclides in a rock sample, and accounting for the flux of the cosmic rays and the half-life of the nuclide, it is possible to estimate how long the sample has been exposed to cosmic rays.Although dating with this method is expensive and the entire process takes a long time, TCN dating has the advantage that the dateable material is produced by the rockslide event itself by exposing fresh material surfaces to the cosmic rays.Displacements rates measured today by differential Global Navigation Systems Satellite Systems (GPS) indicate the same velocity suggesting that the rockslide has been moving nearly constantly over the past 14 thousand years.Results from other sliding surfaces are different and suggest accelerated displacement rates today.

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  1. Cosmogenic nuclide analysis. Cosmogenic nuclides can be used to directly determine the timing of events and. of these nuclides as a dating technique or for

  2. Surface exposure cosmogenic nuclide dating isn't without its problems. the radioactive decay of cosmogenic nuclides, a surface exposure will reach saturation

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