Testing the potential of an elevated temperature IRSL signal from K-feldspar

Publication: Research - peer-reviewConference article – Annual report year: 2009

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Thomsen, K.J., Murray, A.S., Jain, M., Bøtter-Jensen, L. [2008. Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts. Radiat. Meas. 43, 1474–1486] have identified a number of feldspar signals which show significantly less anomalous fading than the conventional IRSL signal stimulated at 50 °C and detected in the blue–violet region of the spectrum. One of these was the post-IR IR signal in which first an IR bleach is carried out at a low temperature (e.g. 100 s at 50 °C) and a remaining IRSL signal is measured at an elevated temperature (100 s at 225 °C; detection in the blue–violet region). It is the latter signal that is of interest in this paper. We test such a post-IR IR dating protocol on K-feldspar extracts from a variety of locations and depositional environments and compare the results with those from the conventional IR at 50 °C protocol. Based on laboratory tests (recycling ratio, recuperation, dose recovery) we show that our SAR protocol is suitable for these samples. The observed post-IR IR fading rates (mean g2days = 1.62 ± 0.06%/decade, n = 24; assuming logarithmic fading) are significantly lower than those measured at 50 °C (mean g2days = 3.23 ± 0.13%/decade, n = 24). The signal is bleachable in nature although residual doses of the order of a few Gy are to be expected. After fading correction the ages are indistinguishable from those measured by IR at 50 °C over an age range from a few ka to >260 ka. However, the correction factor for anomalous fading is only 39% of that of the conventional IR at 50 °C signal. This smaller correction factor makes the new post-IR IR ages much less dependent on the inherent assumptions included in the fading correction model.
Original languageEnglish
JournalRadiation Measurements
Publication date2009


Conference12th International Conference on Luminescence and Electron Spin Resonance Dating
CitationsWeb of Science® Times Cited: 105


  • Radiation physics, Nuclear technologies
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ID: 5456032