The effect of optical absorption on the infrared stimulated luminescence age obtained on coarse-grain feldspar

The effect of optical absorption on the infrared stimulated luminescence age obtained on... The occurrence and effect of optical absorption of the infrared stimulated luminescence (IRSL) signal and the thermoluminescence (TL) signal from potassium-rich feldspar is investigated for two samples. If optical absorption of the luminescence signal occurs, it is expected that this will cause an age underestimation that will be most severe for coarser grain sizes. Of the two samples under study here, one sample is shown to be affected by optical absorption, whereas the other is not. There is a significant decline in luminescence age with increasing grain size for the sample which exhibits optical absorption, but not for the other sample. However, both samples show a severe IRSL age underestimation for all grain sizes, compared to the age obtained by optical stimulation of quartz from the same samples. We conclude that, although there is an effect of optical absorption on the IRSL age, there must be additional reasons for the underestimation of the IRSL age. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quaternary Science Reviews Elsevier

The effect of optical absorption on the infrared stimulated luminescence age obtained on coarse-grain feldspar

Quaternary Science Reviews, Volume 19 (10) – Jun 1, 2000

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Publisher
Elsevier
Copyright
Copyright © 2000 Elsevier Science Ltd
ISSN
0277-3791
eISSN
1873-457X
D.O.I.
10.1016/S0277-3791(99)00051-7
Publisher site
See Article on Publisher Site

Abstract

The occurrence and effect of optical absorption of the infrared stimulated luminescence (IRSL) signal and the thermoluminescence (TL) signal from potassium-rich feldspar is investigated for two samples. If optical absorption of the luminescence signal occurs, it is expected that this will cause an age underestimation that will be most severe for coarser grain sizes. Of the two samples under study here, one sample is shown to be affected by optical absorption, whereas the other is not. There is a significant decline in luminescence age with increasing grain size for the sample which exhibits optical absorption, but not for the other sample. However, both samples show a severe IRSL age underestimation for all grain sizes, compared to the age obtained by optical stimulation of quartz from the same samples. We conclude that, although there is an effect of optical absorption on the IRSL age, there must be additional reasons for the underestimation of the IRSL age.

Journal

Quaternary Science ReviewsElsevier

Published: Jun 1, 2000

References

  • Beta source calibration and its dependency on grain transparency
    Bell, W.T.; Mejdahl, V.
  • Luminescence dating using single aliquots
    Duller, G.A.T.
  • Behavioural studies of stimulated luminescence from feldspars
    Duller, G.A.T.
  • Optimizing sampling strategy for radiocarbon dating of Holocene fluvial systems in a vertically aggrading setting
    Törnqvist, T.E.; Van Dijk, G.J.

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