A comparative study of the luminescence characteristics of polymineral fine grains and coarse-grained K-, and Na-rich feldspars

Sumiko Tsukamoto, Mayank Jain, Andrew S. Murray, Christine Thiel, Esther Schmidt, Lara Wacha, Reiner Dohrmann, Manfred Frechen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    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
    Volume47
    Pages (from-to)903-908
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2012
    Event13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011 - Torun, Poland
    Duration: 10 Jul 201114 Jul 2011

    Conference

    Conference13th International Conference on Luminescence and Electron Spin Resonance Dating - LED 2011
    CountryPoland
    CityTorun
    Period10/07/201114/07/2011

    Keywords

    • Feldspar
    • Polymineral
    • IRSL
    • Post-IR IRSL
    • Thermal stability
    • Time-resolved IRSL

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