Show simple item record Helen M. en_US 2011-05-31T10:29:08Z 2011-05-31T10:29:08Z 2007-11 en_US
dc.identifier en_US
dc.identifier.citation Roberts , H M 2007 , ' Assessing the effectiveness of the double-SAR protocol in isolating a luminescence signal dominated by quartz ' Radiation Measurements , vol 42 , no. 10 , pp. 1627-1636 . , 10.1016/j.radmeas.2007.09.010 en_US
dc.identifier.other PURE: 162223 en_US
dc.identifier.other dspace: 2160/6823 en_US
dc.description.abstract The effect of the presence of feldspars that can be shown to exhibit anomalous fading is investigated using the double-SAR protocol. This protocol has been suggested as a method of isolating an optically stimulated luminescence (OSL) signal dominated by quartz from a polymineralic mixture of grains. The progressive removal of feldspars from the silt-sized fraction of sediments from Bignell Hill, Nebraska, is also investigated using chemical treatment with hydrofluorosilicic acid for different durations; the appropriate treatment duration for these sediments is identified as being 7 days. For untreated material, the double-SAR protocol yields IRSL and [post-IR] OSL signals that are both dominated by feldspars and that give the same value for the equivalent dose (D-e) determination. However, for material treated with hydrofluorosilicic acid for 7 days, the IRSL and [post-IR] OSL signals have distinctly different characteristics and appear to be dominated by feldspar and by quartz, respectively. Furthermore, the D-e values determined for the feldspar-dominated IRSL signal are about half those obtained for the quartz-dominated [post-IR] OSL signal. This demonstrates that the double-SAR protocol is not always capable of isolating a quartz-dominated signal; clearly, in some circumstances it is necessary to apply a chemical pre-treatment to remove the contribution from feldspars prior to any luminescence measurements being made. en_US
dc.format.extent 10 en_US
dc.relation.ispartof Radiation Measurements en_US
dc.title Assessing the effectiveness of the double-SAR protocol in isolating a luminescence signal dominated by quartz en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Quaternary Environmental Change Group en_US

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