Multiple and single aliquot luminescence dating techniques applied to quartz extracted from Middle and Upper Weichselian loess, Zemechy, Czech Republic

This paper reports the application of optically stimulated luminescence (OSL) dating to relatively coarse grains (100-200 μm) of quartz extracted from loess. Two approaches were tested - a multiple aliquot technique and a new single aliquot approach, which is especially suited to the dating of small quantities of such grains found in some loess. The results are compared with infra-red stimulated luminescence and thermoluminescence (TL) measurements on the finer-grained (4-11 μm) polymineral fraction and TL measurements on the relatively coarse grains of quartz. The advantages of the new single aliquot (OSL) approach are described and the iterating, computer-controlled measurement procedure is given. The automated iterative single aliquot regeneration (AISAR) method corrects for changes in luminescence sensitivity during the measurement sequence by monitoring the response to a test dose. Some initial measurements are presented for the loess section at Zemechy, Czech Republic, and these show that the AISAR method gives more precise results than those using a multiple aliquot method. Copyright (C) 2000 John Wiley and Sons, Ltd.