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Estimating the number of components in an OSL decay curve using the Bayesian Information Criterion

Estimating the number of components in an OSL decay curve using the Bayesian Information Criterion The optically stimulated luminescence (OSL) decay curve is assumed to consist of a number of first-order exponential components. Improper estimation of the number of components leads to under-or over-fitting of the curve under consideration. Hence, correct estimation of the number of components is important to accurately analyze an OSL decay curve. In this study, we investigated the possibility of using the Bayesian Information Criterion to estimate the optimal number of components in an OSL decay curve. We tested the reliability of this method using several hundred measured decay curves and three simulation scenarios. Our results demonstrate that the quality of the identification can be influenced by several factors: the measurement time and the number of channels; the variability of the decay constants; and the signal-to-noise ratios of a decaying component. The results also suggest that the Bayesian Information Criterion has great potential to estimate the number of components in an OSL decay curve with a moderate to high signal-to-noise ratio. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geochronometria Springer Journals

Estimating the number of components in an OSL decay curve using the Bayesian Information Criterion

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Publisher
Springer Journals
Copyright
Copyright © 2013 by Versita Warsaw and Springer-Verlag Wien
Subject
Earth Sciences; Quantitative Geology; Environmental Monitoring/Analysis; Earth Sciences, general
ISSN
1733-8387
eISSN
1897-1695
DOI
10.2478/s13386-013-0166-x
Publisher site
See Article on Publisher Site

Abstract

The optically stimulated luminescence (OSL) decay curve is assumed to consist of a number of first-order exponential components. Improper estimation of the number of components leads to under-or over-fitting of the curve under consideration. Hence, correct estimation of the number of components is important to accurately analyze an OSL decay curve. In this study, we investigated the possibility of using the Bayesian Information Criterion to estimate the optimal number of components in an OSL decay curve. We tested the reliability of this method using several hundred measured decay curves and three simulation scenarios. Our results demonstrate that the quality of the identification can be influenced by several factors: the measurement time and the number of channels; the variability of the decay constants; and the signal-to-noise ratios of a decaying component. The results also suggest that the Bayesian Information Criterion has great potential to estimate the number of components in an OSL decay curve with a moderate to high signal-to-noise ratio.

Journal

Geochronometria – Springer Journals

Published: Sep 3, 2014

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