Journal
RADIATION MEASUREMENTS
Volume 44, Issue 5-6, Pages 477-482Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radmeas.2009.03.017
Keywords
ESR dating; Fossil enamel; Lower Pleistocene; Single saturating exponential function; Double saturating exponential function
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In ESR dating of tooth enamel, a single saturating exponential (SSE) function is generally used to fit the dose response data points. This study shows several analytical and physical limits of this function when applied on Lower Pleistocene samples with expected ages in excess of one million years. We have checked other mathematical functions to obtain a closer fit to the analytical data. Indeed, the choice of the fitting function becomes crucial as this has a strong influence on the D-E value. Among the functions used, the combination of a double saturating exponential (DSE) function provided the best approximation to the experimental points. The use of just one SSE function seems to lead to D-E systematic overestimations if the D-E values are >300 Gy. (C) 2009 Elsevier Ltd. All rights reserved.
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