Optically Stimulated Luminescence Osl Dating In The Amazonian Wetlands

Author: Sonia Hatsue Tatumi
Editor: Cambridge Scholars Publishing
ISBN: 1527556069
File Size: 31,37 MB
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Optically stimulated luminescence (OSL) dating has proven to be extremely useful for establishing the Late Quaternary chronological framework in many areas of the Brazilian territory. In this region dominated by tropical climate, OSL dating can be more extensively applied than radiocarbon dating due to the generally low potential for the preservation of organic matter in sedimentary samples. This problem is especially critical in areas of the Amazonian lowlands, because of the hot climate and high precipitation rates. The abundance of quartz grains deposited in fluvial and aeolian environments over this region favours OSL dating. More than 20 years of continuous and collaborative work has resulted in the creation of an extensive OSL age database for Late Quaternary sedimentary deposits in the Amazonian lowlands. This effort has contributed to improving the paleoenvironmental and paleoclimatic reconstructions of this region within this period. This book discusses the state of art of OSL dating of Late Quaternary deposits in the Amazonian lowlands, focusing on providing an introduction to dating principles using OSL, and defining the application of OSL techniques as a dating method. It also offers a statistical study and calculation of equivalent dose and annual dose rates, details the sampling and experimental apparatus, and considers the difficulties and adaptation techniques in dating Late Quaternary strata in the Amazonian lowlands.

Optically Stimulated Luminescence Dosimetry

Author: L. Boetter-Jensen
Editor: Elsevier
ISBN: 9780080538075
File Size: 55,89 MB
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Optically Stimulated Luminescence (OSL) has become the technique of choice for many areas of radiation dosimetry. The technique is finding widespread application in a variety of radiation dosimetry fields, including personal monitoring, environmental monitoring, retrospective dosimetry (including geological dating and accident dosimetry), space dosimetry, and many more. In this book we have attempted to synthesize the major advances in the field, covering both fundamental understanding and the many applications. The latter serve to demonstrate the success and popularity of OSL as a dosimetry method. The book is designed for researchers and radiation dosimetry practitioners alike. It delves into the detailed theory of the process from the point of view of stimulated relaxation phenomena, describing the energy storage and release processes phenomenologically and developing detailed mathematical descriptions to enable a quantitative understanding of the observed phenomena. The various stimulation modes (continuous wave, pulsed, or linear modulation) are introduced and compared. The properties of the most important synthetic OSL materials beginning with the dominant carbon-doped Al2O3, and moving through discussions of other, less-well studied but nevertheless important, or potentially important, materials. The OSL properties of the two most important natural OSL dosimetry material types, namely quartz and feldspars are discussed in depth. The applications chapters deal with the use of OSL in personal, environmental, medical and UV dosimetry, geological dating and retrospective dosimetry (accident dosimetry and dating). Finally the developments in instrumentation that have occurred over the past decade or more are described. The book will find use in those laboratories within academia, national institutes and the private sector where research and applications in radiation dosimetry using luminescence are being conducted. Potential readers include personnel involved in radiation protection practice and research, hospitals, nuclear power stations, radiation clean-up and remediation, food irradiation and materials processing, security monitoring, geological and archaeological dating, luminescence studies of minerals, etc.

Optically Stimulated Luminescence

Author: Eduardo G. Yukihara
Editor: John Wiley & Sons
ISBN: 9780470977217
File Size: 79,28 MB
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Optically stimulated luminescence has developed into one of the leading optical techniques for the measurement and detection of ionizing radiation. This text covers, in a readable manner, advanced modern applications of the technique, how it can play a useful role in different areas of dosimetry and how to approach the challenges presented when working with optically stimulated luminescence. The six chapters are as follows: Introduction, including a short history of OSL and details of successful applications Theory and Practical Aspects Personal Dosimetry Space Dosimetry Medical Dosimetry Other Applications and Concepts, including retrospective and accident dosimetry, environmental monitoring and UV dosimetry Throughout the book, the underlying theory is discussed on an as-needed basis for a complete understanding of the phenomena, but with an emphasis of the practical applications of the technique. The authors also give background information and relevant key references on each method, inviting the reader to explore deeper into the subject independently. Postgraduates, researchers, and those involved with radiation dosimetry will find this book particularly useful. The material is both relevant and accessible for both specialists and those new to the field, therefore is fundamental to any academic interested in modern advances of the subject.

Thermally And Optically Stimulated Luminescence

Author: Reuven Chen
Editor: John Wiley & Sons
ISBN: 1119995760
File Size: 45,36 MB
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Thermoluminescence (TL) and optically stimulated luminescence (OSL) are two of the most important techniques used in radiation dosimetry. They have extensive practical applications in the monitoring of personnel radiation exposure, in medical dosimetry, environmental dosimetry, spacecraft, nuclear reactors, food irradiation etc., and in geological /archaeological dating. Thermally and Optically Stimulated Luminescence: A Simulation Approach describes these phenomena, the relevant theoretical models and their prediction, using both approximations and numerical simulation. The authors concentrate on an alternative approach in which they simulate various experimental situations by numerically solving the relevant coupled differential equations for chosen sets of parameters. Opening with a historical overview and background theory, other chapters cover experimental measurements, dose dependence, dating procedures, trapping parameters, applications, radiophotoluminescence, and effects of ionization density. Designed for practitioners, researchers and graduate students in the field of radiation dosimetry, Thermally and Optically Stimulated Luminescence provides an essential synthesis of the major developments in modeling and numerical simulations of thermally and optically stimulated processes.

Questions And Answers On Thermoluminescence Tl And Optically Stimulated Luminescence Osl

Author: Claudio Furetta
Editor: World Scientific Publishing Company
ISBN: 981310726X
File Size: 78,78 MB
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Currently, thermoluminescence (TL) and optically stimulated luminescence (OSL) are the main techniques for studying the luminescence properties of several materials, mainly insulators called phosphors. Frequently, however, students and experts alike need to clarify some concepts related to the effects and defects present in the radiation interaction with solids generated by these phenomena. In this book, a series of questions and corresponding answers give a clearer explanation about the concepts, theory and models related to TL and OSL, including applications in important related areas. Students, researchers and teachers will find this book a good guide for understanding TL and OSL as methods for studying the nature of luminescent solids. It provides a quick way for clearing doubts in the concepts and terminology concerning OSL and TL, as it is intended to answer many questions which can be encountered in practical applications.

Optically Stimulated Luminescence Osl Dating Of Atalh Y K Samples

Author: Göze K. Akoğlu
Editor:
ISBN:
File Size: 38,77 MB
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An Introduction To Time Resolved Optically Stimulated Luminescence

Author: Makaiko L Chithambo
Editor: Morgan & Claypool Publishers
ISBN: 1643271989
File Size: 58,22 MB
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Time-resolved optical stimulation of luminescence has become established as an important method for measurement of optically stimulated luminescence. Its enduring appeal is easy to see with the number of materials studied growing from the initial focus on natural minerals such as quartz and feldspar to synthetic dosimeters such as -Al2O3:C, BeO and YAlO3:Mn2+. The aim of time-resolved optical stimulation is to separate in time the stimulation and emission of luminescence. The luminescence is stimulated from a sample using a brief light pulse. The ensuing luminescence can be monitored either during stimulation in the presence of scattered stimulating light or after the light-pulse. The time-resolved luminescence spectrum measured in this way can be resolved into components each with a distinct lifetime. The lifetimes are linked to physical processes of luminescence and thus provide a means to study dynamics involving charge transfer between point-defects in materials. This book is devoted to time-resolved optically stimulated luminescence and is suitable for researchers with an interest in the study of point-defects using luminescence methods. The book first sets the method within the context of luminescence field at large and then provides an overview of the instrumentation used. There is much attention on models for time-resolved optically stimulated luminescence, two of which are analytical and the third of which is based on computational simulation of experimental results. To bring relevance to the discussion, the book draws on examples from studies on quartz and a-Al2O3:C, two materials widely investigated using this method. The book shows how kinetic analysis for various thermal effects such as thermal quenching and thermal assistance can be investigated using time-resolved luminescence. Although use of light sums is an obvious choice for this, contemporary work is discussed to show the versatility of using other alternative methods such the dynamic throughput.

Optically Stimulated Luminescence Dating Techniques And Their Application To Dating The Formation Of Late Quaternary Loess In Southern North Island New Zealand

Author: Ningsheng Wang
Editor:
ISBN:
File Size: 48,94 MB
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Advances In Physics And Applications Of Optically And Thermally Stimulated Luminescence

Author: Chen Reuven
Editor: World Scientific
ISBN: 1786345803
File Size: 57,88 MB
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In this volume, international leading experts in the study of thermally and optically luminescence give an up-to-date, comprehensive coverage of the theoretical and experimental aspects of these subjects, as well as their applications.The theory of thermoluminescence (TL) and optically stimulated luminescence (OSL) are discussed in detail including mainly solid state models of localized and delocalized transitions. These models cover the effects occurring during the excitation by irradiation and the read-out by heating or by exposure to light. The methods described consist of analytical mathematical considerations as well as numerical simulations.The main application of these effects, namely radiation dosimetry, includes personal and environmental dosimetry, as well as retrospective dosimetry and the dosimetry of cosmic radiation and space missions. Also discussed in detail are archaeological and geological dating, the use of luminescence dosimetry in medical physics as well as general applications in geosciences, other model subjects such as time-resolved luminescence and thermally assisted OSL, and the sister-subject of thermoluminescence in photosynthetic materials.

Using Optically Stimulated Luminescence To Date Quartz Containing Samples

Author: Bailey Wallace
Editor:
ISBN:
File Size: 36,30 MB
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Applications Of Optically Stimulated Luminescence Dating In The Chinese Loess Plateau

Author: 张俊杰
Editor:
ISBN:
File Size: 17,62 MB
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Optically Stimulated Luminescence In Fluoroperovskites For Dosimetric Applications

Author: Christian Josef Dotzler
Editor:
ISBN:
File Size: 32,93 MB
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Optically Stimulated Luminescence Dating Of Archaeological And Environmental Sequences In North Africa And Arabia

Author: Natalie Russell
Editor:
ISBN:
File Size: 34,13 MB
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Assessing Optically Stimulated Luminescence Osl Signal Contamination Within Small Aliquots And Single Grain Measurements Utilizing The Composition Test

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Editor:
ISBN:
File Size: 44,90 MB
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Abstract: Quartz in tectonically active regions can suffer from signal contamination when utilized for Optically Stimulated Luminescence (OSL) dating. Typically, these environments bring quartz-bearing bedrock to the surface, which erodes and enters geomorphic systems with little fluvial reworking, resulting in dim OSL signal response. Conversely, feldspars often have an inherently brighter signal, even among bedrock or freshly eroded samples. Environments with dim quartz can be difficult to date as the signal contribution from errant feldspars may dominate the measured signal. Further, immature sediments may retain mineral inclusions within quartz grains that would have been physically or chemically eroded in more mature sediments. Previously, we presented a signal composition test which utilizes thermal quenching and IR bleaching susceptibility to assess the purity of a quartz sample. Additional measurements have been made, looking at the systematics of how small volumes of feldspar can affect the results of aliquots analyzed with this composition test. Further, different feldspar samples have been assessed for their response to the composition test and chemical compositions were determined using energy-dispersive X-ray (EDX) spectroscopy with a scanning electron microscope (SEM). Finally, we present a single grain protocol for the composition test.

Rotherwas Herefordshire

Author: Jean-Luc Schwenninger
Editor:
ISBN:
File Size: 68,54 MB
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Optically Stimulated Luminescence Dating Of Ice Marginal Palaeosandar From The Last Irish Sea Ice Stream

Author: Ian Mark Thrasher
Editor:
ISBN:
File Size: 57,25 MB
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Optically Stimulated Luminescence And Electron Spin Resonance Dating Of Sedimentary Quartz

Author: Oana-Georgiana Antohi
Editor:
ISBN:
File Size: 74,43 MB
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A Gamma Neutron Discriminating Cooled Optically Stimulated Luminescence Cosl Dosemeter

Author:
Editor:
ISBN:
File Size: 13,24 MB
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The Cooled Optically Stimulated Luminescence (COSL) of CaF2:Mn (grain sizes from 0.1 to 100 microns) powder embedded in a hydrogenous matrix is reported as a function of fast-neutron dose. When all the CaF2:Mn grains are interrogated at once, the COSL plastic dosemeters have a minimum detectable limit of 1 cSv fast neutrons; the gamma component from the bare 252cf exposure was determined with a separate dosemeter. We report here on a proton-recoil-based dosemeter that generates pulse height spectra, much like the scintillator of Hornyak, (2) to provide information on both the neutron and gamma dose.