Surface exposure cosmogenic nuclide dating
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.
In this paper the history and theory of surface exposure dating are reviewed followed by an extensive outline of the fields of application of the method.Scaling factors are being evaluated with neutron monitors and analysis of same age natural samples taken along altitudinal transects (for example lava flows).Numerical modeling is being used to constrain production rates and scaling factors both now and in the past.Ages of rock avalanche deposits throughout Norway cluster in the first few thousand years after deglaciation, however ages throughout the entire Holocene have also been obtained.The principles of dating sliding surfaces are more explained in the publication on the Oppstadhornet slide on Otrøya. 16.6 to 14.2 kyrs ago and past long-term displacement rates are in the order of 2 mm/yr.
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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.