Universität zu Köln

Kreutzer, Sebastian ORCID: 0000-0002-0734-2199, Schmidt, Christoph ORCID: 0000-0002-2309-3209, DeWitt, Regina ORCID: 0000-0003-2876-5489 and Fuchs, Markus (2014). The a-value of polymineral fine grain samples measured with the post-IR IRSL protocol. Radiat. Meas., 69. S. 18 - 30. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1350-4487

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Abstract

Recent post-IR IRSL (pIRIR) dating studies using polymineral fine grains assumed that the a-values obtained for the IRSL signal at 50 C and the pIRIR signal at higher temperatures (e.g. 225 degrees C) are identical. However, the a-value of a sample depends on the stimulation method, and the assumption mentioned above remains to be tested. Using five polymineral fine grain samples, this study investigates whether a common a-value can be used for both the IR and the pIRIR signals. Applying the pIRIR protocol, the avalues were measured with three different methods of signal resetting (optical bleaching, end of SAR cycle, heating). In addition, uncorrected a- and 13-irradiation induced growth curves were determined for three samples and fitted with single saturating exponential functions. For the investigated samples we found significant mean differences, 0.023 +/- 0.012 and higher, in the a-values determined for the IR50 and pIRIR(225) signals. Synthetic a-values deduced from uncorrected multiple-aliquot dose response curves seem to confirm this observation. Although, in summary, our results indicate that the practice of using a common a-value should be carefully re-considered, the physical reasons remain to be determined. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kreutzer, Sebastian UNSPECIFIED orcid.org/0000-0002-0734-2199 UNSPECIFIED Schmidt, Christoph UNSPECIFIED orcid.org/0000-0002-2309-3209 UNSPECIFIED DeWitt, Regina UNSPECIFIED orcid.org/0000-0003-2876-5489 UNSPECIFIED Fuchs, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-427189
DOI:	10.1016/j.radmeas.2014.04.027
Journal or Publication Title:	Radiat. Meas.
Volume:	69
Page Range:	S. 18 - 30
Date:	2014
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1350-4487
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LOESS PROFILE; K-FELDSPARS; LUMINESCENCE; OSL; ALPHA; CHRONOLOGY; SIGNALS Multiple languages Nuclear Science & Technology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42718