Time-resolved luminescence from feldspars: New insight into fading

S. Tsukamoto, P.M. Denby, A.S. Murray, L. Bøtter-Jensen

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    Time-resolved infrared optically stimulated luminescence (IR-OSL) signals of K- and Na-feldspar samples extracted from sediments were measured in UV, blue and red detection windows, using a fast photon counter and pulsed IR stimulation (lambda = 875 nm). We observe that the relative contribution of long lifetime (similar to 20 mu s) components in K-feldspars is greater than that in Na-feldspars at each detection wavelength. From any one feldspar sample, red and blue IR-OSL signals have a greater contribution of long lifetime components than UV IR-OSL. We found this long lifetime component was significantly more stable than shorter lifetime components, by comparing natural/regenerated and prompt/delayed time-resolved IR-OSL. We also compared both pulsed and continuous wave (CW) equivalent dose (D-e) values from four feldspar samples. For pulsed IR-OSL, the signal was collected between 10 and 100 mu s after the diodes were switched off, to avoid all contributions from short lifetime components. In all cases, the pulsed D-e values were larger than the CW D-e values, regardless of the type of the feldspar and the detection wavelength; the pulsed D-e values were also all consistent with those calculated from the quartz D-e. It is possible that the long lifetime component from feldspars do not show anomalous fading. (c) 2006 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    JournalRadiation Measurements
    Issue numberSp. Iss.
    Pages (from-to)790-795
    Publication statusPublished - 2006
    Event11th International Conference on Luminescence and Electron Spin Resonance Dating - Köln, Germany
    Duration: 24 Jul 200529 Jul 2005


    Conference11th International Conference on Luminescence and Electron Spin Resonance Dating

    Cite this

    Tsukamoto, S., Denby, P. M., Murray, A. S., & Bøtter-Jensen, L. (2006). Time-resolved luminescence from feldspars: New insight into fading. Radiation Measurements, 41(Sp. Iss.), 790-795. https://doi.org/10.1016/j.radmeas.2006.05.013