The Effect of Turbidity on the Solar Resetting of the Luminescence Signal: Implications for Luminescence Geochronology
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Date
1995-03
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The Ohio State University
Abstract
Quantitative determinations of the effect of sediment concentration on the extent of solar resetting of the luminescence signal within suspended sediments in a laboratory simulation of a turbid water system are made using thermoluminescence [TL], infrared stimulated luminescence [IRSL], and red stimulated luminescence [RedSL]. The results show a general, but non-linear, increase in residual luminescence with increasing suspended sediment concentration for TL, IRSL, and RedSL. Results of this investigation demonstrate flocculation to be a significant process contributing to residual luminescence in waterlain sediments. The results of the investigation question the reliability of TL to provide accurate age determinations for waterlain sediments, and indicate IRSL may be applicable to date
sediments deposited in low concentrations (≤10 mg/L), but
offers no significant advantages over TL for dating sediments
deposited in higher concentrations. Comparison of the TL, IRSL and RedSL data shows the RedSL signal to be the most sensitive of the three to solar resetting through turbid water and highlights the future utility of red stimulated luminescence to date a wide range of waterlain sediments.