Universität zu Köln

Riedesel, S., Bell, A. M. T., Duller, G. A. T., Finch, A. A., Jain, M., King, G. E., Pearce, N. J. and Roberts, H. M. (2021). Exploring sources of variation in thermoluminescence emissions and anomalous fading in alkali feldspars. Radiat. Meas., 141. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1879-0925

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Abstract

Alkali feldspars are routinely used in retrospective dosimetry using luminescence methods. However there is a signal loss over time, termed 'anomalous fading', which results in age underestimation if uncorrected. Although significant improvements have been made in recent years, luminescence dating of feldspars remains challenging. This paper investigates the relationships between chemistry, structural state and the scale of exsolution with thermoluminescence (TL) emission spectra and infrared stimulated luminescence (IRSL) fading rates. We measure TL emission spectra, where possible linking the recombination site to physical features of the feldspar crystals. We show that fading rates are lowest in ordered end-member Naand K-feldspars but significantly greater in disordered end-members, showing that Al-Si order influences fading. As well as having very low fading rates, ordered end-member samples have distinctive TL emission spectra, with the yellow-green emission dominant, while all other samples have a dominant blue emission. Perthites, i.e. exsolved members of the (Na,K)-feldspar solid solution, show greater fading than disordered end-members and fading is greatest in semi-coherent macroperthite. We propose that the state of Al-Si-order, and the occurrence of defects and dislocations at the perthite lamellar interfaces influence anomalous fading rates in feldspars.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Riedesel, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bell, A. M. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duller, G. A. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Finch, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jain, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED King, G. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearce, N. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roberts, H. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-594014
DOI:	10.1016/j.radmeas.2021.106541
Journal or Publication Title:	Radiat. Meas.
Volume:	141
Date:	2021
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1879-0925
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Nuclear Science & Technology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59401