IRSL dating of K-feldspars: Modelling natural dose response curves to deal with anomalous fading and trap competition

• Published in: Radiation measurements Vol. 44; no. 5; pp. 594 - 599
• Main Authors: Kars, Romée H., Wallinga, Jakob
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.05.2009; Elsevier
• Subjects: Anomalous fading; Earth sciences; Earth, ocean, space; Exact sciences and technology; Fading correction; Geochronology; High dose region; IRSL; Isotope geochemistry. Geochronology; K-feldspar; IRSL; Anomalous fading; High dose region; K-feldspar; Fading correction; models; density; alkali feldspar; quartz; feldspar; anomalies; traps; luminescence; corrections; silicates; dating; framework silicates
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2009.03.032

We recently proposed a model that reconstructs the natural dose response curve for K-rich feldspars, using laboratory fading measurements and dose response as input parameters. The model is based on the relationship between recombination centre density and trap lifetime. In this study we test the working of the model by comparing modelled feldspar ages with known quartz OSL ages of the same samples and with anomalous fading-corrected feldspar ages. The modelled feldspar ages are in good agreement with quartz OSL ages and corrected feldspar ages, opening possibilities for future use of the model on samples without independent age constraints. Furthermore, we investigate the effects of trap competition on the build-up of IRSL signal using two new variations of the model. Results show that incorporating trap competition into the model reduces the agreement between feldspar IRSL ages and quartz OSL ages.