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
Full text not available from this repository.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 | ||||||||||||||||||||
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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 | ||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/16336 |
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