Nordic laboratory for luminescence dating ris nscalendar autoupdatingcurrentcalendar
) in quartz and feldspar optical stimulated luminescence (OSL) dating of both heated and sedimentary materials.The most recent of these is the single-aliquot regenerative-dose (SAR) protocol, first suggested by Murray and Roberts (Radiation Measurements 29, 503–515, 1998).The water in the bay is very turbid (secchi depth 0.1 m), but there is significant reworking by waves along the shores.For example, luminescence ages of raised littoral and marine deposits provide the age control for many reconstructions of Pleistocene events in the Arctic.Due to the nature of the depositional environment (e.g.preheat temperature, size of test dose, stimulation temperature) on the estimation of .The dependence of the dose response on prior treatment is tested explicitly, and the significance of thermal transfer discussed.
In this approach, each natural or regenerated dose OSL measurement is corrected for changes in sensitivity using the OSL response to a subsequent test dose (10–20% of ).If the sensitivity correction is adequate, then the corrected OSL response should be independent of prior dose and thermal/optical treatment, i.e.there should be no change in the sensitivity-corrected dose–response curve on remeasurement.Here we examine the interpretation of the sensitivity corrected growth curve as a function of dose, and the effect of changing measurement conditions (e.g.
short transport distance, turbid water, long polar night) these types of sediment may not be completely zeroed at the time of deposition.
To test the significance of incomplete bleaching in this type of environment, surface sediments were sampled along a transect from the margin of a glacier out into a nearby bay on NW Svalbard.