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Is there a common alpha-efficiency in polymineral samples measured by various infrared stimulated luminescence protocols?

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1515/geochr-2015-0095
URN to cite this document: urn:nbn:de:bvb:703-epub-4285-4

Title data

Schmidt, Christoph ; Bösken, Janina ; Kolb, Thomas:
Is there a common alpha-efficiency in polymineral samples measured by various infrared stimulated luminescence protocols?
In: Geochronometria. Vol. 45 (2018) Issue 1 . - pp. 160-172.
ISSN 1897-1695
DOI: https://doi.org/10.1515/geochr-2015-0095

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Project information

Project title:
Project's official titleProject's id
Lumineszenz-Chronologien spätpleistozäner Siedlungen in den rumänischen KarpatenSCHM 3051/1-1
Open Access PublizierenNo information

Abstract

Dating of polymineral silt-sized samples by use of post-infrared infrared stimulated lumi-nescence (pIRIR) protocols at elevated temperature has recently gained attraction due to assumed lower rates of anomalous fading. The α-efficiency (or a-value) associated with the pIRIR signals as an integral part of age calculation has, however, not yet been sufficiently constrained. Here we present a set of 65 a-values determined for 47 samples collected across Europe with two different IRSL protocols in two laboratories. By testing the basic preconditions for application of the single-aliquot regeneration (SAR) procedure to constrain a-values and by comparing SAR results to a-values obtained by multiple-aliquot protocols, we demonstrate that SAR-derived a-values are reliable for the majority of samples. While aliquot size and signal resetting mode prior to α-regeneration do not appear to affect the resulting a-value, we detected significant differences in mean a-values measured in the two laboratories. For the pIRIR290 signal, a-values average to 0.085 ± 0.010 (Bayreuth) and 0.101 ± 0.014 (Cologne), while a modified SAR protocol yields 0.081 ± 0.008 (Bayreuth). Whereas provenance-specific differences in a-values might be masked by overall scatter, systematic offsets between laboratories are attributed to technical issues such as heater and source calibration. Based on the present data set, use of the same routine dating equipment is strongly advised for both dose and a-value measurements.

Further data

Item Type: Article in a journal
Keywords: Luminescence; Infrared stimulated luminescence – IRSL; Polymineral samples; Alpha-efficiency; A-value; Loess
DDC Subjects: 500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Geomorphology
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-4285-4
Date Deposited: 06 Mar 2019 11:23
Last Modified: 06 Mar 2019 11:24
URI: https://epub.uni-bayreuth.de/id/eprint/4285

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