Free local sex site with no membership - Optical dating techniques

Chapter 1: Introduction Chapter 2 2.1: Natural radioactivity 2.2: The natural dose-rate 2.3: Evaluation of dose-rate 2.4: Artificial irradiation 2.5: Dependence on rate at which dose is delivered, and on temperature Chapter 3 3.1: Sample collection 3.2: Preparation of aliquots for OSL measurement 3.3: Measurement of OSL Chapter 4 4.1: Unwanted signals: backgrounds and residuals 4.2: Irradiation and preheating 4.3: Multi-aliquot methods 4.4: The single-aliquot Chapter 5 5.1: Aeolian deposits 5.2: Water-laid sediment 5.3: Organic-rich sediment 5.4: Glaciation-related deposits 5.5: Earthquake-related studies 5.6: Two unusual applications 5.7: Applications other than sediment dating Chapter 6 6.1: Factors affecting rapidity of bleaching 6.2: The level reached 6.3: Intrinsic indications about zeroing - analysis of the shine-down curve 6.4: Other intrinsic indications about zeroing Chapter 7 7.1: Thermal transfer 7.2: Shine-curve analysis revisited 7.3: Reasons for preheating 7.4: Preheating of feldspars and polymineral fine-grains 7.5: Preheating of quartz 7.6: Quartz preheating and sensitivity change 7.7: Retention lifetimes '...highly timely and very welcome...With this book, Martin Aitken has put together the materials for readers to choose and to make new tools to tackle the problems encountered in optical dating.' - The Holocene, 1999 ' This hardback book exudes authority ...

optical dating techniques-27

In optical dating, the light is used to measure the trapped electron population, an which only the electrons accumulated in light-sensitive elec-tron traps and assumed to be completely emptied by sunlight during the process of deposition, are measured.

Thus, the zeroing problem can be basically solved by sunlight bleaching in the sediment dating.

The photons of the emitted light must have higher energies than the excitation photons in order to avoid measurement of ordinary photoluminescence.

A sample in which the mineral grains have all been exposed to at least a few seconds of daylight can be said to be of zero age; when excited it will not emit any such photons. The minerals that are measured are usually either quartz or feldspar sand-sized grains, or unseparated silt-sized grains.

The text is divided into three parts; main text, technical notes and appendices.

In this way the main text is accessible by those researchers with a limited knowledge of physics, with the technical notes providing depth of understanding for those who require it.

Written by one of the foremost experts on optical dating, this book aims to bring together in a coherent whole the various strands of research that are ongoing in the area.

It gives beginners an introduction to the technique as well as acting as a valuable source of up to date references.

Optical dating is one of several techniques in which an age is calculated as follows: (age) = (total absorbed radiation dose) / (radiation dose rate).

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