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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.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.
Setting-to-zero 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 6.5 Bleaching and sensitivity change in feldspar 7 Thermal effects 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 Technical notes Appendix A: Radioactivity data Appendix B: Optical filters B.1 Some transmission characteristics B.2 Examples of use Appendix C: Unwanted components of the observed signal Appendix D: Anomalous fading and other causes of age shortfall D.1 Introduction D.2 Mechanisms D.3 Detection D.4 Suggested remedies D.5 Concluding remarks Appendix E: Sensitization of the 110C Tl peak in fired quartz References Index timely and very welcome...Our first investigations focussed on two samples collected from a recent alluvial deposit (see photograph on the left); they were used to investigate the extent of resetting in different particle size fractions of quartz (4-11 μm, 63-90 μm, 90-125 μm, 125-180 μm, 180-212 μm and 212-250 μm) as well as in polymineral fine (4-11 μm) grains.Both samples show satisfactory OSL and IRSL characteristics.The presence of genuinely zero-age or near-zero-age grains in modern-age and very young samples poses a problem for many existing burial dose estimation procedures used in optical (optically stimulated luminescence, OSL) dating. The un-logged age models provide accurate burial doses and final OSL ages for roughly three-quarters of the total number of samples considered in this study. This difficulty currently necessitates consideration of relatively simplistic and statistically inferior age models. Sensitivity tests reveal that the un-logged versions of the central and minimum age models are capable of producing accurate burial dose estimates for modern-age and very young ( values are known with high precision.