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Stübner, K.; Jonckheere, R.C.; Ratschbacher, L.
Radiation measurements, 11/2005, Letnik: 40, Številka: 2Journal Article, Conference Proceeding
Recoiling daughters of α -decaying U and Th impurities in mica and other minerals produce localised lattice damage: alpha-recoil tracks. The age of a sample can be calculated from the number of tracks per unit volume ( N ART ) . To this end, the mica is etched and the etch pits at the sites of recoil-tracks are counted under the optical microscope. Because the measured track densities increase with etching time, N ART is calculated from the fitted regression line. A number of problems inherent in this approach are overcome by the etch–anneal–etch and the mirror-image methods. The track densities determined with these methods are independent of etching time. Although both methods need improvement, they hold the potential of a precise determination of N ART from a single measurement in future recoil-track dating.
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