• Author: Tsukamoto, Sumiko

    Leibniz Institute for Applied Geophysics, Germany

  • Author: Jain, Mayank

    Radiation Physics, Center for Nuclear Technologies, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Murray, Andrew S.

    Aarhus University, Denmark

  • Author: Thiel, Christine

  • Author: Schmidt, Esther

    Leibniz Institute for Applied Geophysics, Germany

  • Author: Wacha, Lara

    Leibniz Institute for Applied Geophysics, Germany

  • Author: Dohrmann, Reiner

    German Federal Institute for Geosciences and Natural Resources, Germany

  • Author: Frechen, Manfred

    Leibniz Institute for Applied Geophysics, Germany

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The IRSL and post-IR IRSL (pIRIR) signal characteristics of polymineral fine grains are investigated and compared with those of K- and Na-rich feldspar extracts. TL signal loss after IR and pIRIR stimulations occurs mainly at around 320 °C for polymineral and Na-feldspar samples and around 410 °C for K-feldspar samples, when a preheat temperature of 250 °C for 60 s is used. After preheating to a higher temperature (320 °C for 60 s) all samples show a TL reduction around 410 °C in the blue detection window. Pulse annealing experiments for IRSL and pIRIR signals for preheats between 320 °C and 500 °C indicate that the signal stabilities are similar among the different feldspar types, when a higher preheat temperature (>320 °C) is used. Thermal activation energies for IRSL and pIRIR signals are largest in K-feldspar and smallest in polymineral fine grains, in both blue and UV detection windows for both fast time-resolved (TR) and continuous wave (CW) signals. These results suggest that IRSL and pIRIR signals in polymineral fine grains originate mainly from Na-feldspar grains; these signals are less thermally stable than those from K-feldspar, but a more stable signal (presumably from K-feldspar grains) can be obtained using a higher preheat temperature.

Original languageEnglish
JournalRadiation Measurements
Pages (from-to)903-908
StatePublished - 2012


Conference13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011
CitationsWeb of Science® Times Cited: No match on DOI


  • Feldspar, Polymineral, IRSL, Post-IR IRSL, Thermal stability, Time-resolved IRSL
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ID: 7728176