Optically stimulated luminescence dating

28-May-2019 10:00

However, such uncertainties do not apply to grains measured individually. Age models constitute a statistical means of recognizing clusters of grains with distinct exposure/burial histories within a sample (Galbraith et al.

For this reason, OSL geochronologists often turn to single grains to achieve greater resolution (Duller et al. 1999), which enables the most representative age for a depositional event to be determined. Novel variants of luminescence dating can surpass that maximum, pushing its performance limits deeper into the Pleistocene.

The dosimeters are Al: C crystal pellets with exceptional sensitivity to natural ionizing radiation.

Dosimeters are usually in place for several months to register the total dose rate contributed from all local potential inputs.

Rapid signal resetting of OSL under direct or indirect sunlight (bleaching) rendered OSL pivotal in sediment dating because it can date the time elapsed since the last exposure of natural minerals to daylight. These new methods have allowed chronometric dating on sedimentary deposits that goes beyond the usual distal age limit of conventional OSL dating, which is estimated to be about 200,000 years (Rhodes 2011; Roberts et al. This paper aims to inform geoscientists, archaeologists, and geoarchaeologists about the physical background, methodology, and applications of optically stimulated luminescence dating.

It soon became evident that OSL could be applicable to dating numerous types of sedimentary environments—aeolian, coastal, fluvial, glacial, and lacustrine—thereby enhancing our understanding of Earth's surface processes (Rhodes 2011; Roberts et al. The case studies illustrated here are mainly drawn from the authors' own work and provide applications of OSL dating and its long-range variants to best advantage, as well as giving examples that challenge their performance.

Radioelement concentrations are then converted to dose-rate units (Gy·ka) using conversion factors (Guérin et al.

The last few decades have seen a significant impact of geoscience techniques and concepts on palaeoenvironmental and (geo)archaeological studies.

Geoarchaeology and palaeoenvironmental studies both require a solid chronological framework by which to recognize causes and effects, as well as rates of processes.

For this purpose, in addition to archaeological and geomorphological reasoning, radiocarbon dating (C) is used to date organic materials.

But in view of its ineffectiveness to date materials older than 50 ka and the omnipresence of (inorganic) clastic sediments in most depositional contexts, optically stimulated luminescence (OSL) dating and its long-range dating alternatives are indispensable.

Radioelement concentrations are then converted to dose-rate units (Gy·ka) using conversion factors (Guérin et al.

The last few decades have seen a significant impact of geoscience techniques and concepts on palaeoenvironmental and (geo)archaeological studies.

Geoarchaeology and palaeoenvironmental studies both require a solid chronological framework by which to recognize causes and effects, as well as rates of processes.

For this purpose, in addition to archaeological and geomorphological reasoning, radiocarbon dating (C) is used to date organic materials.

But in view of its ineffectiveness to date materials older than 50 ka and the omnipresence of (inorganic) clastic sediments in most depositional contexts, optically stimulated luminescence (OSL) dating and its long-range dating alternatives are indispensable.

2011) that deliver the dose rate per radioelement's concentration (ppm).