Universität zu Köln

King, Georgina E., Burow, Christoph, Roberts, Helen M. and Pearce, Nicholas J. G. (2018). Age determination using feldspar: Evaluating fading-correction model performance. Radiat. Meas., 119. S. 58 - 74. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1350-4487

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Abstract

The recent introduction of post-IR IRSL measurement protocols has prompted a resurgence in luminescence applications using feldspar, some of which are affected by anomalous fading related signal loss. Many fading-corrected feldspar ages are reported in the literature, however few of those ages have been corrected using the model of Huntley (2006) (Huntley, D.J., 2006. An explanation of the power-law decay of luminescence. Journal of Physics: Condensed Matter 18(4), 1359-1365]. Here we present a new R function that calculates fading-corrected ages using the model of Huntley (2006), implemented with either a single-saturating exponential (1EXP) or general-order kinetic (GOK) fit. We evaluate the performance of the model through (i) contrasting measured and modelled field saturation values for a suite of 41 published saturated samples, and (ii) through using the model to fading-correct feldspar ages of samples with independent age control. Our results indicate that when implemented with 1EXP this model has an accuracy of 10% for predicting sample saturation, but that independent ages may be overestimated when the model is used to fading-correct samples across a range of timescales. In contrast, providing that the dose response curve has been characterised beyond 600 Gy, implementing the Huntley (2006) model with a GOK fit yields accurate age estimations. Modelled age overestimation for 1EXP is associated with dose response curve deviation from a single-saturating exponential. Finally we contrast the laboratory measured light levels of a suite of 50 saturated samples with their corresponding fading rates. We show that these saturated samples may yield D-e), values below 2D(0), and thus that 2D(0) is not an effective screening criterion for sample saturation where no anomalous fading correction is made.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code King, Georgina E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Burow, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Roberts, Helen M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearce, Nicholas J. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-163362
DOI:	10.1016/j.radmeas.2018.07.013
Journal or Publication Title:	Radiat. Meas.
Volume:	119
Page Range:	S. 58 - 74
Date:	2018
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 DOSE-RESPONSE CURVES; STIMULATED LUMINESCENCE; OSL-THERMOCHRONOMETRY; MAZAMA ERUPTION; K-FELDSPAR; ICP-MS; LOESS; TEPHRA; WASHINGTON; SEDIMENTS Multiple languages Nuclear Science & Technology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16336