Optical dating sediments

The dose distributions of all samples are broadly scattered and have overdispersion values between 25 and 43%, some samples are significantly skewed.The shape of the dose distributions points to other sources of scatter, in addition to partial bleaching.Comparison of 1 mm multi-grain and single-grain data demonstrates that the luminescence signal of one multi-grain aliquot most likely is from a single grain.Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.Empirical methods are introduced to evaluate the possible values of equivalent dose accumulated since the grains were deposited.These methods involve the analysis of the equivalent doses and the natural IRSL signals obtained using single-disc dose determination methods.

Both experiments indicate that the luminescence signal is partially bleached prior to deposition.

Although there is stratigraphic correlation based on archaeological finds of Ahmarian origin, numerical age estimates are lacking.

We applied single-aliquot optical dating of coarse grained quartz of wadi deposits and investigated the luminescence properties in detail to achieve more accurate age information about the time of human occupation.

These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar.

The radiation causes charge to remain within the grains in structurally unstable "electron traps".