Methodological considerations in the optical dating of quartz etiquette dating after death of spouse

Posted by / 13-Nov-2017 12:29

Methodological considerations in the optical dating of quartz

The basic principles of all the different luminescence dating techniques, and also electron spin resonance (ESR) dating, are the same: each relies on the effects of radiation exposure.Ages are obtained by measuring the cumulative effect of ionizing radiation on the crystal structure of certain minerals.The optically-stimulated luminescence from quartz grains extracted from sediments at two archaeological sites has been studied.The sites were the Upper Palaeolithic site at Hengistbury Head, Dorset, U. and the Upper Aterian site at Chaperon Rouge, Morocco.I have been at the forefront of pioneering research in geochronology for the past 2 decades, and lead the optically stimulated luminescence (OSL) dating laboratory in the School of Earth & Environmental Sciences at the University of Wollongong.Accurate dating of key events in Earth’s history is fundamental to provide the historical framework for a wide variety of applications in the geological, biological and archaeological sciences.The oldest glacial stage (MR-I) has been established on the basis of detailed geomorphological evidence such as U-shaped valley morphology, trimlines, and truncated spurs.

For reliable estimation of the equivalent dose (De), we investigated certain basic experimental parameters in the fine-grained quartz MAR OSL dating of Chinese loess.When the preheat time is fixed as 10s,the De preheat plateau regions are 250 ∼ 280°C and 180 ∼260°C for regeneration dose and test dose respectively for fine-grained quartz in Chinese loess,no matter using single-aliquot regenerative-dose(SAR) protocol or sensitivity change corrected multiple-aliquot regenerative-dose (SMAR) protocol.After reanalyzing the De preheat plateau data derived by SMAR protocol, variation of the ratio of natural OSL intensity to regenerated dose aliquot OSL intensity (N/R) with preheat temperature changes in the similar way with the plot of De as a function of preheat temperature.Laboratory storage and preheating experiments were carried out to study anomalous fading of infrared stimulated luminescence (IRSL) signals derived from polymineral grains extracted from Chinese loess.Results of laboratory storage at 150 °C and higher temperature preheating experiments showed that such thermal treatments could lessen the effect of fading and indicated the presence of both...

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Equivalent dose(De) preheat plateau test is an often used approach to determine an appropriate preheat temperature in optically stimulated luminescence(OSL) dating.

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