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Books > Science & Mathematics > Chemistry > Physical chemistry > Nuclear chemistry, photochemistry & radiation
A stone carving from the 14th century B.C. records that the Egyptian pharaoh Akhenaten (born Amenhoteph IV) and his wife, Nefertiti, recognized the importance of sunlight to life. In fact, Akhenaten initiated a monotheistic religion, with Aton, the sun, as God. One of his daughters be came the wife of King Tut Ankamon, the spelling of whose name indicates a return to the old religion and an eclipse of interest in photobiology among the pharaohs. A renewal of interest in photobiology in modern times was climaxed in 1928 by the establishment of an international organization for photobiology under the title Comite International de la Lumiere (C.I.L.). Its present title, Comite International de Photobiologie (C.I.P.), was adopted at a meeting in Paris in 1951. The first of a series of international congresses on photobiology was held in 1954 and probably represents the beginning of modern day photobiology. Medical men were prominent in the activities of the old C.I.L., for the importance of natural sunlight in human health and disease was obvious though not well understood. The bringing together of physicians with physicists, chemists, and biologists from the pure and applied branches of their subjects was the aim of the older C.I.L. and continues to the present day through the C.I.P."
Microdosimetry and Its Applications is an advanced textbook presenting the fundamental concepts and numerical aspects of the absorption of energy by matter exposed to ionizing radiation. It is the only comprehensive work on the subject that can be considered definitive. It provides a deeper understanding of the initial phase of the interaction of ionizing radiation with matter, especially biological matter, and its consequences.
The papers included in this volume were presented at the symposium on "Americium and Curium Chemistry and Technology" at the International Chemical Congress of Pacific Basin Societies in Honolulu, Hawaii, December 16-21, 1984. This symposium commemorated forty years of research on americium and curium. Accordingly, the papers included in this volume begin with historical perspectives on the discovery of americium and curium and the early characterization of their chemical properties, and then cover a wide range of subjects, such as thermodynamic properties, electronic structure, nuclear reactions, analytic chemistry, high pressure phase transitions, and technological aspects. Thus, this volume is a review of the chemistry of americium and curium, and provides a perspective on the current research on these elements forty years after their discovery. The editors would like to thank the participants in this symposium for their contributions. It is a pleasure to acknowledge the assistance of Ms. Barbara Moriguchi in handling the administrative aspects of the symposium and of the production of this volume. April 2, 1985 Norman M. Edelstein Materials and Molecular Research Division Lawrence Berkeley Laboratory University of California Berkeley, California 94720, U.S.A. James D. Navratil Rockwell International Rocky Flats Plant P.O. Box 464 Golden, Colorado 80402-0464, U.S.A. Wallace W. Schulz Rockwell Hanford P.O. Box 800 Richland, Washington 99352, U.S.A.
Risk assessment has come to assume acute importance in the former Soviet Union since money is so scarce, yet the needs for cleanup are so huge. Other factors contribute to this situation, too: New leaders are still emerging, and governmental structures are still evolving. This creates a particular difficulty for environmentalists who attempt to become involved in the risk assessment process. New information continues to surface on the fallout from Chernobyl and its consequences for human health. Scientists are still debating the effects of low doses of radiation delivered over a long period of time. This type of contamination is especially prevalent in the Russian North, for example, as a result of the dumping of nuclear submarine reactors into the Kara and Barents Seas. This book examines the complexities of risk assessment in the FSU at this unique time in history.
With contributions from 24 international authorities, Synthetic Organic Photochemistry offers a leading-edge presentation of the most recent and in-demand applications of photochemical methodologies. Outlining a wide assortment of reaction types entailing cycloadditions, cyclizations, isomerizations, rearrangements, and other organic syntheses, this reference offers unmatched coverage of all reactions in the foreground of organic photochemistry and ties in critical considerations that overlap in modern photochemistry and organic chemistry, such as stereoselectivity. Select experimental procedures demonstrate the industrial and academic value of reactions presented in the text.
Preface by Sir Harold W. Kroto, FRS Although the discovery of C60 is now almost 15 years old and the extraction occurred 60 nearly ten years ago it is amazing that the range of spin-off research still seems to expand without limits. The birth of the Fullerenes has spawned fascinating research programmes in almost every area of chemistry and physics and this monograph explores a particularly interesting and important area - the behaviour of these pure carbon cages in the presence of high-energy radiation. The C molecules must also be in the space 60 between the stars (albeit in quantities too small to detect at this time) as the conditions in the atmospheres of some carbon stars appear to be almost identical to the plasmas generated in the Kratschmer-Huffman system for making C60. The conditions in space 60 are very varied as it is pervaded by a plethora of high-energy particles (photons, cosmic rays, etc.) and the chapters in this book discuss, among other things, the response of C60 and various derivatives to probing by a range of high-energy particles. Various fullerenes and fullerene salts have been examined by positron annihilation techniques, revealing details of their electronic and structural properties as well as phase transition behaviour. Muons have been implanted to enable mSR techniques to probe with high sensitivity the endohedral electronic structures of fullerenes including those in superconducting systems. Mossbauer spectroscopy can give valuable information about the interactions in certain types of organometallic complexes and in particular it can reveal the degree of charge transfer in endohedral species. Nuclear irradiation/radiochemical analytical techniques have been applied resulting in information ranging widely from the stability of the fullerene cage containing endohedral metal atoms in various oxidation states to pharmaceutical studies of the distribution of fullerenes in the internal organs of animals. Time resolved pulsed radio lysis provides information at high sensitivity enabling micromolar concentrations to be probed e.g. C60 in water in which it is almost insoluble! Redox and rate constant measurements have given useful information on photolytically generated radical ion pairs involving a variety of fullerenes. Interesting accounts of observations involving the production of rare gas endohedral species by nuclear recoil have revealed information about the recoil mechanism. From the first moment of its discovery the unique cage structure of C60 initiated thoughts about the interesting possibility of encapsulation of atoms and molecules. One possibility that immediately suggested itself was the isolation of chemically toxic radionuclides by encapsulation in the (supposedly chemically innocuous) cage for pharmaceutical purposes. The possibility of creating cages carrying a radioactive atom inside the cage and moieties outside with molecular recognition capabilities is a most exciting prospect and discussion is included of some important first steps aimed at achieving this fascinating breakthrough. Another problem dealt with in this monograph is the effect of elemental impurities which has, as our studies progress, become more and more a matter of concern and interest. Impurities can have important effects on the observed physical and chemical behaviour of fullerenes, especially when very sensitive probe techniques are applied. This valuable book reviews some detailed studies of fundamental properties of fullerenes, which are leading to a deeper understanding of their behaviour in the presence of high energy radiation. The information obtained already and that which will be garnered in future studies of the kind described here is an absolutely necessary prerequisite for success in applications.
Nuclear Analytical Methods in the Life Sciences 1994 is a forefront
survey of key presentations from the 1993 International Conference
on Nuclear Analytical Methods in the Life Sciences. Sponsored by
the International Atomic Energy Agency (IAEA), this useful volume
covers the spectrum of multidisciplinary research on both the
methodological aspects and the development of nuclear analytical
methods and their applications in the life sciences.
This work is a comprehensive and much-needed tool for the teaching and practice of radioanalytical chemistry. It encompasses a concise theoretical background, laboratory work, and data interpretation. It also contains chapters on the most current and visible applications of radioanalytical techniques. Its emphasis on the practical aspects on laboratory setup and operation make it a valuable tool for training professionals and students alike.
The handling of actinides and actinide-based materials provides significant technological challenges due to the toxicity and radioactivity associated with these materials. These challenges are particularly apparent in the nuclear power industry. Under normal operation, a reactor can produce a significant amount of spent fuel requiring subsequent containment for geologic times, and under accident conditions it can release lethal doses of radioactive material to the environment. Inevitably, radioactive material will enter the environment, necessitating as complete an understanding as possible of its behavior. An understanding of the interaction between actinides and the environment must be based on a knowledge of their basic physical and chemical properties. To date, although there is general agreement on the principles for waste disposal, no facility has been built for the long term disposal of high level radioactive waste from either normal reactor operations or from accidental catastrophes. This makes it most important for the scientific and technical community to develop the necessary cross-disciplinary understanding that will help us implement safe and secure waste management, accident remediation and accident prevention systems.
A survey of recent research in the fields of condensed matter physics and chemistry based on novel NMR and ESR techniques. Applications include quantum computing, metal nanoparticles, low dimensional magnets, fullerenes as atomic cages, superconductors, porous media, and laser assisted studies. The book is dedicated to Professor Robert Blinc, on the occasion of his seventieth birthday, in appreciation of his remarkable scientific accomplishments in the NMR of condensed matter.
ADRIANO DE MAIO IReR President This publication originated from the workshop on "Control and risk prevention of dangerous materials and crisis management" that took place in Sofia, Bulgaria, in March 2009. The basic idea is that international scientific cooperation can effectively contribute to security, stability and solidarity among nations, through increased collaboration, networking and capacity-building and supporting democratic growth and economic development in Partner Countries. We are all facing new needs and threats, deriving from a world changing constantly its social, political and economic dimension and, for this reason, the international dialogue through civil science represents a way forward to comm- ment to global common issues. In fact, the Lombardy Regional Institute for Research has developed some international activities aiming at establishing networks of scientists and experts in defined areas and subjects. Through one of these activities, the Institute entered in touch with the Science for Peace and Security Programme. In this framework, we decided to share the experience of Lombardy Region on transportation of dangerous materials (half of their total transport in Italy): research and studies in civil area conducted in Lombardy Region are considered the most innovative in Europe for the results obtained. Comparison with diverse international experiences is a great opportunity of implementing present results and applying them to different applications (from civil to anti-terrorism) and extending them to countries other than Italy.
Written by one of the founders of gas-chromotagraphic methods in radiochemistry, this book attempts a genuine first. It is a discussion of the state of art of heavy element inorganic radiochemistry. It aims to be a real addition to the understanding of this crucial topic. Written as much for newcomers to the field as experts, its goal is also to stimulate wider use of the advantageous gas phase techniques for common elements.
In this fascinating biography, Patricia Rife interprets both the life and times of Lise Meitner (1878 1968), providing a rich background of the scientific discoveries and social milieu that affected the research, events, personalities, and politics of 20th century quantum physics. Rife asks the central question of why, given the priority evidence of Meitner's role in the interpretation of nuclear fission, was she too not awarded the Nobel Prize?
This monograph describes the theory and practice of electron spectrometry using synchrotron radiation. The book is in three parts. After a short review of background theory, neon is used to elucidate the principles of the photoelectron and Auger spectra. The second part of the book looks at experimental aspects, including characteristic features of electrostatic analysers, detectors, lenses, disturbances, and optimisation, and then illustrates theory and experiment with details of recent experiments. The third part provides useful reference data, including wavefunctions, special theory, polarisation and special aspects of instrumentation. A detailed reference list completes the volume. The study of electron spectrometry using synchrotron radiation is a growing field of research driven by the increasing availability of advanced synchrotron radiation light sources and improved theoretical methods for solving the many-electron problem in atoms. This balanced account will be of value to both theorists and experimentalists working in this area.
This text elucidates the achievements in calculating photodissociation cross sections and fragment state distributions from first principles, starting from multi-dimensional potential energy surfaces and the Schrödinger equation of nuclear motion. Following an extended introduction in which the various types of observables are outlined, the next four chapters summarize the basic theoretical tools, namely the time-independent and time-dependent quantum mechanical approaches as well as the classical picture of photodissociation. The discussion of absorption spectra, diffuse vibrational structures, the vibrational and rotational state distributions of the photofragments form the core of the book. More specific topics such as the dissociation of vibrationally excited molecules, emission during dissociation, or nonadiabatic effects are discussed in the last third of the book.
This is a comprehensive account of the nature of the hazards presented by ionizing radiation and the methods of protection. It takes the reader through the general background of the subject, the underlying principles applied to the control of radiation hazards (including chapters on human physiology, the biological effects of radiation and radiation detection and measurement), before moving to specialized topics such as medical applications and waste disposal.;This edition has been revised and updated to reflect the significant changes that have occurred in this area in recent years. The most recent ICRP recommendations are included, the section on legislation has been expanded to emphasize the European and International requirements in addition to those of the UK, while the chapter on radiological emergencies has been rewritten to highlight international developments arising from the Chernobyl disaster.
This newly revised and updated edition of Radiation Biophysics
provides an in-depth description of the physics and chemistry of
radiation and its effects on biological systems. Coverage begins
with fundamental concepts of the physics of radiation and
radioactivity, then progresses through the chemistry and biology of
the interaction of radiation with living systems. The Second
Edition of this highly praised text includes major revisions which
reflect the rapid advances in the field. New material covers recent
developments in the fields of carcinogenesis, DNA repair, molecular
genetics, and the molecular biology of oncogenes and tumor
suppressor genes. The book also includes extensive discussion of
the practical impact of radiation on everyday life.
In the last two decades it was demonstrated that, in addition to masses and charges, magnetic moments of nuclei are able to influence remarkably chemical reactions. This book presents the physical background (both theoretical and experimental) of the magnetic isotope effects in radical reactions in solutions. Special attention has been paid to the quantitative interpretation of the available experimental data. This book will be useful for physicists, chemists and biologists employing the isotope effect in their investigations as well as for those involved in isotope separation and isotope enrichment projects. Additionally, the magnetic isotope effect appears to be important in geochemistry and cosmochemistry. The book can be recommended for postgraduates and senior undergraduate students.
This book presents coherent and systematic coverage of the broad and dynamic field of free atom and cluster atom chemistry. The text provides a comprehensive overview of the current literature and describes the mostimportant experimental techniques developed since 1980 including bimetallic clusters/catalysts, carbon clusters (fullerenes) and trapped single atoms. Metal atoms, clusters, and particles are covered in sequence with the Periodic Table.
The biological action of radiation undoubtedly constitutes an issue of actual con cern, particularly after incidences like those in Harrisburg or Chernobyl. These considerations, however, were not the reason for writing this book although it is hoped that it will also be helpful in this respect. The interaction of radiation with biological systems is such an interesting research objective that to my mind no special justification is needed to pursue these problems. The combination of physics, chemistry and biology presents on one hand a fascinating challenge to the student, on the other, it may lead to insights which are not possible if the dif ferent subjects remain clearly separated. Special problems of radiation biology have quite often led to new approaches in physics (or vice versa), a recent example is "microdosimetry" (chapter 4). Biological radiation a9tion comprises all levels of biological organization. It starts with the absorption in essential atoms and molecules and ends with the development of cancer and genetic hazards to future generations. The structure of the book reflects this. Beginning with physical and chemical fundamentals, it then turns to a description of chemical and subcellular systems. Cellular effects form a large part since they are the basis for understanding all further responses. Reactions of the whole organism, concentrating on mammals and especially humans, are subsequently treated. The book concludes with a short discussion of problems in radiation protection and the application of radiation in medical therapy. These last points are necessarily short and somewhat superficial."
The project that finally led to this book, was originally started with Dr. Jean-Paul Desclaux. It is a pleasure to thank hirn for a fruitful collaboration stretching over more than a decade. While accepting the responsibility for any remaining errors and omissions, I wish to acknowledge in particular the comments by Teijo Aberg, Viktor Flambaum, Burkhard Fricke, Franz Mark and Arne Rosen. The Bibliography was compiled using a Fortran program, written for the DEC 20 at the University of Turku by Matti Hotokka, and adap ted to the University of Helsinki Burroughs 7800 by Dage Sundholm. Harriet Bjornstrom did most of the typing and Kathe Ramsay cross checked the text against the Bibliography. Readers, interested in obtaining a Wordstar-readable, IBM PC compatible diskette file (about 520 kb on a two-sided diskette) of the Bibliography should contact the author Helsinki, 20 August, 1986 Pekka Pyykko CONTENTS 1. Introduction ................................................. 1 Table 1.1. Managraphs and ather general references ........... 2 2. One-particle problems ........................................ 5 2.1. Special relativity and the ald quantum theary ........... 5 2.2. On the Klein-Gardon equation ............................ 5 2.3. The Dirac equation ...................................... 6 Table 2.l. The Dirac equation: interpretative studies, symmetry properties and non-relativistic limits ............ 7 Table 2.2. The Dirac equation: further transformations ...... 13 Table 2.3. The Dirac equation: solutions for hydrogen-like systems. . ........................................ 1 6 Table 2.4. The Dirac equations: solutions for various n- coulomb fields. . ................................. 21 Table 2.5. Relativistic virial theorems ..................... 26 3. Quantum electrodynamical effects ............................ 27 Table 3.1."
A modern introduction to photochemistry covering the principles and applications of this topic from both a physical chemistry and organic chemistry angle. Coverage ranges from subjects such as lasers, the atmosphere, biochemistry, medicine and industry and also includes the latest developments in relation to photochemical molecular machines, photodynamic therapy applied to cancer, photochromatic imaging, and photostabilizers. Little in the way of prior knowledge is assumed, and the reader is aided by numerous worked examples, learning objectives, chapter summaries and problems.
A modern introduction to photochemistry covering the principles and applications of this topic from both a physical chemistry and organic chemistry angle. Coverage ranges from subjects such as lasers, the atmosphere, biochemistry, medicine and industry and also includes the latest developments in relation to photochemical molecular machines, photodynamic therapy applied to cancer, photochromatic imaging, and photostabilizers. Little in the way of prior knowledge is assumed, and the reader is aided by numerous worked examples, learning objectives, chapter summaries and problems.
Drawing on the continued wealth of photochemical research, this volume combines reviews on the latest advances in the field with specific topical highlights. Starting with periodical reports of the recent literature on physical and inorganic aspects, light induced reactions in cryogenic matrices, properties of transition-metal compounds, time-resolved spectroscopy, the exploitation of solar energy and the molecules of colour. Coverage continues with highlighted topics, in the second part, from photoresponsive hydrogels, the tunable photoredox properties of organic dyes, light-driven asymmetric organocatalytic processes, dual gold-photoredox catalysis, the preparation and characterization of photosensitizers for triplet-triplet annihilation photon upconversion and the role of photochemistry on traditional synthetic processes. This volume will include for the first time a section entitled 'SPR Lectures on Photochemistry', providing examples for academic readers to introduce a photochemistry topic and precious help for students in photochemistry. Providing critical analysis of the topics, this book is essential reading for anyone wanting to keep up to date with the literature on photochemistry and its applications. |
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