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.
|Issue number||Sp. Iss.|
|Publication status||Published - 2006|
|Event||11th International Conference on Luminescence and Electron Spin Resonance Dating - Köln, Germany|
Duration: 24 Jul 2005 → 29 Jul 2005
|Conference||11th International Conference on Luminescence and Electron Spin Resonance Dating|
|Period||24/07/2005 → 29/07/2005|
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