People Secretfriend hot chat

Create your free personals profile and start meeting Romanian singles!

Optical dating sediments

Rated 3.89/5 based on 854 customer reviews
updating flash player on blackberry pearl Add to favorites

Online today

Eighteen aliquots were first beached by sunlight in groups of three, then given a known laboratory beta dose (10 Gy), after which the standard SAR-protocol (Murray and Wintle, 2000) was applied using six different preheat and cutheat temperatures (preheat for 10 s at 180–280°C) followed by cutheat 40°C lower than preheat).The measured dose is indistinguishable from the known given dose at preheat temperatures of 260°C and cutheat 220°C (Fig. In addition, we applied a dose recovery test to 24 single quartz grain using a 260°C preheat for 10 s and a 220°C cutheat, with results showing that the average dose recovery ratio is 0.99 (Fig. Based on the above results, a preheat of 260°C and a cutheat of 220°C were selected for all the samples.., 2010). We have compared the results of SMAR and SAR protocol of the fine grain quartz for one sample. But the SMAR protocol can save much more measurement time.

Three samples deposited before the 1985 earthquake were collected from trench, and one sample deposited after the 1985 earthquake (Fig. Cosmogenic Be depth-profile ages on detrital sand and pebble from a trench on the same terrace several km to the west from our study area (Fig.

To improve efficiency, we measured very small aliquots (~80–220 grains per disc as observed under the microscope), as most likely only one or two quartz grains on each disc give a signal, mimicking single grain measurements (Arnold of each individual small aliquot was projected on the sample-specific DRC to calculate the De for that particular aliquot.

Aliquots were rejected if the single regenerative dose point did not lie on the SA-SGC within SA-SGC errors.

Only 1.5–3.6% of the grains have a detectable OSL signal.

Single grain quartz ages are similar to the expected ages.