Compared with quartz, feldspar has a number of attractive luminescence features. Archaeometry 49 4 : As a result, when dating feldspars, it is necessary to separate K-feldspars from Ca and Na-feldspars and analyze them separately. These factors make the use of OSL dating both a science and an art form.
We have to be very careful not to expose the sediments to sunlight when we do this! Once this sediment is deposited and subsequently buried, it is removed from light and powerpoint exposed to low levels of powerpoint radiation from the surrounding. In order to determine the paleodose of a sample of unknown age, the natural signal is measured first after which the sample is irradiated artificially using a well-calibrated laboratory-based source. Calculation of the Dose Rate The calculation of the dose rate introduces uncertainties due to substantial variability being observed in potassium, uranium and thorium which are the principal sources of environmental radiation.