The a-value of polymineral fine grain samples measured with the post-IR IRSL protocol
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 °C) are identical. However, the a-value of a sample depends on the stimulation method, and the assumption men...
Gespeichert in:
| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
October 2014
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| In: |
Radiation measurements
Year: 2014, Jahrgang: 69, Pages: 18-29 |
| ISSN: | 1879-0925 |
| DOI: | 10.1016/j.radmeas.2014.04.027 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.radmeas.2014.04.027 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S135044871400184X 
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| Verfasserangaben: | Sebastian Kreutzer, Christoph Schmidt, Regina DeWitt, Markus Fuchs |
MARC
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| 245 | 1 | 4 | |a The a-value of polymineral fine grain samples measured with the post-IR IRSL protocol |c Sebastian Kreutzer, Christoph Schmidt, Regina DeWitt, Markus Fuchs |
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| 520 | |a 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 °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 a-values were measured with three different methods of signal resetting (optical bleaching, end of SAR cycle, heating). In addition, uncorrected α- and β-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 pIRIR225 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. | ||
| 650 | 4 | |a -value | |
| 650 | 4 | |a Fine grain | |
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