Abstract
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 ( λ = 875 nm ) . We observe that the relative contribution of long lifetime ( ∼ 20 μ 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 μ 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.
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