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IRSL and post-IR IRSL residual doses recorded in modern dust samples from the Chinese loess plateau

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Języki publikacji
EN
Abstrakty
EN
Using a set of modern/young (0 to about 200 years old) dust samples collected from the Chinese Loess Plateau the bleachability of IRSL measured at 50°C (IR50) and post-IR50 elevated temperature IRSL (measured at 225°C and at 290°C) is investigated by measuring the apparent (residual) doses recorded by these signals. Doses recorded by quartz OSL are used as a reference. Allowing for differences in dose rates it seems that both IRSL and post-IR IRSL signals yield residual doses that are significantly larger than the doses measured in quartz. These residual doses can be largely explained by thermal transfer caused by preheating. Nevertheless, we advise against the use of a low temperature preheat (<200°C) with IR50 to date loess samples because, as has been reported before, the signal appears to be thermally unstable. In general, we conclude that it may not be advisable to apply post-IR IRSL dating to Chinese loess samples where residuals of up to ~20 Gy are a significant fraction of the total dose. However, these residuals quickly become unimportant when dating older samples, and this is the age range in which post-IR IRSL dating is likely to be most useful.
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Strony
432--440
Opis fizyczny
Bibliogr. 46 poz., wykr.
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autor
autor
autor
autor
  • Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark, jabu@risoe.dtu.dk
Bibliografia
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  • Roberts HM and Wintle AG, 2003. Luminescence sensitivity changes of polymineral fine grains during IRSL and [post-IR] OSL measurements. Radiation Measurements 37(6): 661-671, DOI 10.1016/S1350-4487(03)00245-2.
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  • Thiel C, Buylaert J-P, Murray A, Terhorst B, Hofer I, Tsukamoto S and Frechen M, 2011a. Luminescence dating of the Stratzing loess pro-file (Austria) - Testing the potential of an elevated temperature post-IR IRSL protocol. Quaternary International 234(1-2): 23-31, DOI 10.1016/j.quaint.2010.05.018.
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  • Thomsen KJ, Murray AS and Jain M, 2011. Stability of IRSL signals from sedimentary K-feldspar samples. Geochronometria 38(1): 1-13, DOI 10.2478/s13386-011-0003-z.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWMA-0005-0013
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