Universität zu Köln

Bartz, Melanie, Arnold, Lee J., Spooner, Nigel A., Demuro, Martina ORCID: 0000-0002-5799-4216, Campana, Isidoro ORCID: 0000-0002-1262-7594, Rixhon, Gilles, Brueckner, Helmut and Duval, Mathieu ORCID: 0000-0003-3181-7753 (2019). First experimental evaluation of the alpha efficiency in coarse-grained quartz for ESR dating purposes: implications for dose rate evaluation. Sci Rep, 9. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

We present the first experimental evaluation of the alpha efficiency value for electron spin resonance (ESR) dating of coarse quartz grains, which is used for the evaluation of the internal and external alpha dose rate components. Based on our results, we recommend the use of an a-value of 0.07 +/- 0.01 (1 sigma) for both the Al and Ti centres. Although we acknowledge that quartz ESR alpha efficiency may be sample dependent, and could also be impacted by other sources of uncertainty, this potential variability is presently impossible to evaluate given the absence of other experimental a-values available in the ESR dating literature. Measured radioactivity of quartz grains from the Moulouya catchment (NE Morocco) provides an internal dose rate in the range of 50-70 mu Gy/a when using an a-value of 0.07. The use of this empirically derived a-value for the evaluation of the internal and external alpha dose rate has a limited overall impact on the final ESR age results: they change by <2% and <3%, respectively, in comparison with those obtained with an assumed a-value. However, the large variability observed among the broader sample dataset for quartz internal radioactivity and hydrofluoric acid (HF) etching rates underscores the potential importance of undertaking experimental evaluations of alpha dose rate parameters for each dated sample.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bartz, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Arnold, Lee J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spooner, Nigel A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Demuro, Martina UNSPECIFIED orcid.org/0000-0002-5799-4216 UNSPECIFIED Campana, Isidoro UNSPECIFIED orcid.org/0000-0002-1262-7594 UNSPECIFIED Rixhon, Gilles UNSPECIFIED UNSPECIFIED UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Duval, Mathieu UNSPECIFIED orcid.org/0000-0003-3181-7753 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-123968
DOI:	10.1038/s41598-019-54688-9
Journal or Publication Title:	Sci Rep
Volume:	9
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRON-SPIN-RESONANCE; LOWER MOULOUYA RIVER; MIDDLE PALEOLITHIC SITE; SEDIMENTARY QUARTZ; LAKE MUNGO; OSL; AGE; LUMINESCENCE; QUATERNARY; SIZE Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12396