Luminescence dating english heritage

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Additional references are summarised within the 'Bibliography' section. A record of how the Earth's magnetic field has changed over time is required to calibrate the measured information from an archaeomagnetic sample into a calendar date. It was first realised that the direction of the Earth's field changes with time in the 16 th century, since which time scientists beginning with Henry Gellibrand have periodically made observations of the changes in both the declination and inclination at magnetic observatories. The record of how the Earth's magnetic field has changed is referred to as a secular variation curve. The British secular variation curve is based on the observatory data as well as direct measurements from archaeological materials.
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Luminescence dating including thermoluminescence and optically stimulated luminescence is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past. The method is a direct dating technique , meaning that the amount of energy emitted is a direct result of the event being measured. Better still, unlike radiocarbon dating , the effect luminescence dating measures increases with time. As a result, there is no upper date limit set by the sensitivity of the method itself, although other factors may limit the method's feasibility.
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Thermoluminescence dating

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Until recently, chronological control on these deposits was limited to terrace stratigraphy and limited amino-acid racemisation AAR determinations. Recent developments in both this and optically stimulated luminescence OSL dating make them potentially powerful tools for improving the chronological control on such sequences. These results will help with ongoing investigation of patterns of early human settlement. Where OSL dating is the only technique available, it seems to replicate well, but must be treated with caution since there are relatively few aliquots.
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