Radioluminescence

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Publisher : Linköping University Electronic Press
ISBN 13 : 917929684X
Total Pages : 61 pages
Book Rating : 4.1/5 (792 download)

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Book Synopsis Radioluminescence by : Jan Lindström

Download or read book Radioluminescence written by Jan Lindström and published by Linköping University Electronic Press. This book was released on 2021-03-24 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: A phosphor or scintillator is a material that will emit visible light when struck by ionising radiation. In the early days of diagnostic radiology, it was discovered that the radiation dose needed to get an image on a film, could be greatly reduced by inserting a fluorescent layer of a phosphor in direct contact with the film. Thus, introducing the step of converting the ionising radiation to light in a first step. Going forward in time, film has been replaced with photodetectors and there is now a variety of imaging x-ray systems, still based on phosphors and scintillators. There is continuous research going on to optimise between the radiation dose needed and a sufficient image quality. These factors tend to be in opposition to each other. It is a complicated task to optimise these imaging system and new phosphor materials emerges regularly. One of the key factors is the efficiency of the conversion from xrays to light. In this work this is denoted “extrinsic efficiency”. It is important since it largely determines the final dose to the patient needed for the imaging task. Most imaging x-ray detectors are based on phosphor or scintillator types where their imaging performance has been improved through tweaking of various parameters (light guide structure, higher density, light emission spectrum matching to photodetectors, delayed fluorescence quenching etc) One key factor that largely determines the extrinsic efficiency of a specific phosphor is the particle size. Larger particles result in a higher luminance of the phosphor for the same radiation dose as does as a thicker phosphor layer (to a limit). There exists already a battery of models describing various phosphor qualities. However, particle size and thickness have not been treated as a fully independent variables in previous model works. Indirectly, the influence of these parameters is accounted for, but the existing models were either considered too general, containing several complex parameters and factors to cover all kind of cases or too highly specialised to be easily applicable to fluorescent detectors in diagnostic radiology. The aim of this thesis is therefore to describe and assess a simple model denoted the “LAC-model” (after the original authors Lindström and Alm Carlsson), developed for a fluorescent layer using individual sub-layers defined by the particle size diameter. The model is thought to be a tool for quickly evaluating various particle size and fluorescent layer thickness combinations for a chosen phosphor and design. It may also serve as a more intuitive description of the underlying parameters influencing the final extrinsic efficiency. Further tests affirmed the validity of the model through measurements. The LACmodel produced results deviating a maximum of +5 % from luminescence measurements. During the development of the model various assumptions and simplifications were made. One assumption was the absence of a so called “dead layer”. This is a layer supposedly surrounding each particle decreasing the efficiency of converting x-rays to light. It is not completely “dead” as in inactive but is thought to have a reduced efficiency. This phenomenon was struggled with, when historically designing electron beam stimulated phosphors for various applications (i.e. displays, TV tubes etc). There are also articles reporting dead layer influence for x-ray detectors (usually spectrometers i.e. not for imaging). By introducing a dead layer in the LAC-model the effect of the layer was investigated and was found to result in a change of less than 8% for the extrinsic efficiency. It was also noted that sometimes a dead layer effect may emerge at surfaces of a scintillator slab but not necessarily connected to the phosphor particles themselves. Due to differences between phosphor material and the surroundings, an interface effect arose to compete with the process of inherent dead layers of the individual particles. It was found to be mostly negligible for x-rays in the studied energy and material range. However, an effect was shown for electrons as incident ionising radiation which could shed some light on the strangely neglected apparent dead layer created this way. Finally, applications, one involving developing a prototype for checking the light field radiation field coincidence, were evaluated for overall performance and the optimisation level of the applied fluorescent layer. Interesting findings were made during the development process: for the first time to the knowledge of the author, focus shift wandering was quantified in the corresponding movement of the x-ray field edge and a non-trivial discussion on the concept of an apparent light field edge resulted in a modified definition of the same. En fosfor eller scintillator är ett material som avger synligt ljus när det träffas av joniserande strålning. Inom diagnostisk radiologi upptäckte man i ett tidigt skede att stråldosen som behövdes för att få en bild på en röntgenfilm, reducerades kraftigt om man placerade ett fluorescerande skikt, en fosfor, i direkt kontakt med filmen. I nutid har film ersatts med fotodetektorer och det finns nu en mängd olika röntgenbildsystem men som fortfarande är baserade på fosforer och scintillatorer. Det pågår en kontinuerlig forskning för att optimera mellan erforderlig stråldos och en tillräcklig god diagnostisk bildkvalitet. Dessa faktorer tenderar att motverka varandra. Det är en komplicerad uppgift att optimera röntgenbildsystemen och nya fosformaterial dyker ständigt upp. En av de viktiga egenskaperna är fosforns omvandlingseffektivitet från röntgen till ljus. I detta arbete används benämningen ”extrinsisk (yttre) effektivitet". Denna egenskap är viktig eftersom den i stor utsträckning bestämmer den slutliga dosen till patienten som krävs för bilddiagnostiken. De flesta röntgendetektorer är baserade på fosfor- eller scintillatortyper där bildprestanda har förbättrats genom att utveckla olika parametrar (ljusledarstruktur, högre densitet, ljusemissionsspektrum som matchar fotodetektorer, minskad efterlysning etc.). En viktig faktor som i stor utsträckning bestämmer omvandlingseffektiviteten hos en specifik fosfor är partikelstorleken. Större partiklar resulterar i en högre luminescens (mer ljus) från fosforen för samma stråldos. Vilket också gäller för ett tjockare fosforlager (till en viss gräns!). Det finns redan fysikaliska modeller som beskriver olika fosforparametrar men partikelstorlek och fosfortjocklek har dock inte hanterats som fristående variabler i dessa modellarbeten. Istället har deras inverkan modellerats indirekt men det har gjort att de befintliga modellerna kan anses komplexa. De är antingen för generella som medför flera komplexa parametrar och faktorer för att täcka alla tänkbara varianter eller för specialiserade för att kunna tillämpas enkelt på fluorescerande detektorer i diagnostisk radiologi. Syftet med denna avhandling är därför att beskriva och analysera en praktisk modell betecknad ”LAC-modellen” (efter de ursprungliga författarna Lindström och Alm Carlsson). Den är utvecklad för ett fluorescerande block som består av flera underliggande skikt vars tjocklek bestäms av partiklarnas diameter. Avsikten med modellen är att den ska vara ett verktyg för att snabbt utvärdera olika varianter av partikelstorlek och tjockleks-kombinationer för en vald fosfor med i grunden samma design. Experiment har bekräftat modellens giltighet och mätresultat visar att modellresultaten avvek maximalt +5% från luminiscensmätningar. Utvecklingen av modellen krävde olika antaganden och förenklingar. Ett antagande var frånvaron av ett så kallat ”dött lager”. Det är ett skikt som antas omge varje partikel och som därför minskar omvandlingseffektiviteten från röntgen till ljus. Det är dock inte helt "dött" i meningen helt inaktivt men har en mindre förmåga att omvandla röntgen till ljus jämfört med fosforns huvudmaterial. Historisk sett har man försökt åtgärda detta fenomen under lång tid och speciellt för applikationer där man använt sig av elektronstrålar (dvs olika typer av displayer, TV-rör etc.). Just för elektroner har man sett att döda skiktet tenderar att växa med tiden. Det finns också artiklar som rapporterar en påverkan av röntgendetektorers funktion (vanligtvis dock för spektrometrar, dvs inte för avbildning). Genom att införa ett dött skikt i LAC-modellen undersöktes skiktets effekt och visade sig resultera i en förändring på mindre än 8% för effektiviteten. Det noterades också att ibland kan en dödskiktsliknande effekt uppstå vid ytor av ett scintillatorblock men inte nödvändigtvis pga. av själva fosforpartiklarnas ljusomvandlingsegenskaper. Då det uppstår skillnader mellan fosformaterialet och omgivningen får man en s.k. gränsskiktseffekt som s.a.s. konkurrerar med kemiskt döda skiktet på de enskilda partiklarna. De döda skiktens inverkan visade sig i princip försumbara för röntgenbild-detektorer - åtminstone inom det studerade energi- och materialområdet. En tydlig effekt kunde dock noteras för joniserande strålning i form av elektroner. Simuleringarna kunde ge en bättre bild av egenskaperna hos det döda skiktet som skapats på detta sätt. Slutligen utvärderades två applikationer med hjälp av LAC-modellen: en prototyp för kontroll av ljusfältets och strålfältets överenstämmelse i läge och position. Samt en etablerad produkt med samma användningsområde. I båda fallen undersöktes det fluorescerande skiktets optimeringsgrad. Intressanta resultat noterades under utvecklingsprocessen av prototypen: för första gången, så vitt författaren vet, kunde man kvantifiera röntgenrörs s.k. fokusvandring.

Yield of Radioluminescence of Organic Matters

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Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Yield of Radioluminescence of Organic Matters by : Z. A. Chizhikova

Download or read book Yield of Radioluminescence of Organic Matters written by Z. A. Chizhikova and published by . This book was released on 1963 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Research on Spectroscopy and Luminescence: The radioluminescence yield of organic substances, by Z.A. Chizhikova

Download Research on Spectroscopy and Luminescence: The radioluminescence yield of organic substances, by Z.A. Chizhikova PDF Online Free

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Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.P/5 (13 download)

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Book Synopsis Research on Spectroscopy and Luminescence: The radioluminescence yield of organic substances, by Z.A. Chizhikova by : Физический институт имени П.Н. Лебедева

Download or read book Research on Spectroscopy and Luminescence: The radioluminescence yield of organic substances, by Z.A. Chizhikova written by Физический институт имени П.Н. Лебедева and published by . This book was released on 1962 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Recent Advances in Technology Research and Education

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Publisher : Springer Nature
ISBN 13 : 3031544501
Total Pages : 335 pages
Book Rating : 4.0/5 (315 download)

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Book Synopsis Recent Advances in Technology Research and Education by : Yukinori Ono

Download or read book Recent Advances in Technology Research and Education written by Yukinori Ono and published by Springer Nature. This book was released on with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Frontal Semiconductor Research

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Publisher : Nova Publishers
ISBN 13 : 9781600212109
Total Pages : 240 pages
Book Rating : 4.2/5 (121 download)

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Book Synopsis Frontal Semiconductor Research by : Oliver T. Chang

Download or read book Frontal Semiconductor Research written by Oliver T. Chang and published by Nova Publishers. This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes within its scope studies of the structural, electrical, optical and acoustical properties of bulk, low-dimensional and amorphous semiconductors; computational semiconductor physics; interface properties, including the physics and chemistry of heterojunctions, metal-semiconductor and insulator-semiconductor junctions; all multi-layered structures involving semiconductor components. Dopant incorporation. Growth and preparation of materials, including both epitaxial (e.g. molecular beam and chemical vapour methods) and bulk techniques; in situ monitoring of epitaxial growth processes, also included are appropriate aspects of surface science such as the influence of growth kinetics and chemical processing on layer and device properties. The physics of semiconductor electronic and optoelectronic devices are examined , including theoretical modelling and experimental demonstration; all aspects of the technology of semiconductor device and circuit fabrication. Relevant areas of 'molecular electronics' and semiconductor structures incorporating Langmuir- Blodgett films; resists, lithography and metallisation where they are concerned with the definition of small geometry structure. The structural, electrical and optical characterisation of materials and device structures are also included. The scope encompasses materials and device reliability: reliability evaluation of technologies; failure analysis and advanced analysis techniques such as SEM, E-beam, optical emission microscopy, acoustic microscopy techniques; liquid crystal techniques; noise measurement, reliability prediction and simulation; reliability indicators; failure mechanisms, including charge migration, trapping, oxide breakdown, hot carrier effects, electro-migration, stress migration; package- related failure mechanisms; effects of operational and environmental stresses on reliability.

Laser Induced Damage in Optical Materials: 1989

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Publisher : ASTM International
ISBN 13 :
Total Pages : 674 pages
Book Rating : 4./5 ( download)

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Book Synopsis Laser Induced Damage in Optical Materials: 1989 by : Alexander J. Glass

Download or read book Laser Induced Damage in Optical Materials: 1989 written by Alexander J. Glass and published by ASTM International. This book was released on 1978 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nuclear Science and Technology

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Publisher : Springer Nature
ISBN 13 : 9819930871
Total Pages : 448 pages
Book Rating : 4.8/5 (199 download)

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Book Synopsis Nuclear Science and Technology by : Shunzhong Luo

Download or read book Nuclear Science and Technology written by Shunzhong Luo and published by Springer Nature. This book was released on 2023-11-15 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook highlights the fundamentals, applications and research frontiers of the civil-use non-power nuclear technology, especially the radioisotopes and radiation technology. The wide scope of applications and the active research in the subject field calls for a comprehensive textbook that not only explains the basic principles but also links the fundamentals to the various application fields. The book systematically leads students from isotope preparation, to nuclear analysis, and to the civil applications in areas such as chemical engineering, agriculture, medicine, environmental protection and materials modification. The application in the energy field is briefly introduced. The book can be used as good teaching materials for upper undergraduate and graduate students in nuclear science and technology. It is also a handy reference book for researchers and engineers in the above mentioned fields.

Luminescence of Biopolymers and Cells

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Publisher : Springer
ISBN 13 : 148996441X
Total Pages : 237 pages
Book Rating : 4.4/5 (899 download)

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Book Synopsis Luminescence of Biopolymers and Cells by : Grigory M. Barenboǐm

Download or read book Luminescence of Biopolymers and Cells written by Grigory M. Barenboǐm and published by Springer. This book was released on 2013-11-21 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Introduction to Time-Resolved Optically Stimulated Luminescence

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Publisher : Morgan & Claypool Publishers
ISBN 13 : 1643271989
Total Pages : 106 pages
Book Rating : 4.6/5 (432 download)

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Book Synopsis An Introduction to Time-Resolved Optically Stimulated Luminescence by : Makaiko L Chithambo

Download or read book An Introduction to Time-Resolved Optically Stimulated Luminescence written by Makaiko L Chithambo and published by Morgan & Claypool Publishers. This book was released on 2018-12-18 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Plastic Scintillators

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Publisher : Springer Nature
ISBN 13 : 3030734889
Total Pages : 647 pages
Book Rating : 4.0/5 (37 download)

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Book Synopsis Plastic Scintillators by : Matthieu Hamel

Download or read book Plastic Scintillators written by Matthieu Hamel and published by Springer Nature. This book was released on 2021-07-10 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the physics and chemistry of plastic scintillators (fluorescent polymers) that are able to emit light when exposed to ionizing radiation, discussing their chemical modification in the early 1950s and 1960s, as well as the renewed upsurge in interest in the 21st century. The book presents contributions from various researchers on broad aspects of plastic scintillators, from physics, chemistry, materials science and applications, covering topics such as the chemical nature of the polymer and/or the fluorophores, modification of the photophysical properties (decay time, emission wavelength) and loading of additives to make the material more sensitive to, e.g., fast neutrons, thermal neutrons or gamma rays. It also describes the benefits of recent technological advances for plastic scintillators, such as nanomaterials and quantum dots, which allow features that were previously not achievable with regular organic molecules or organometallics.

Photonanotechnology for Therapeutics and Imaging

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Publisher : Elsevier
ISBN 13 : 0128178418
Total Pages : 424 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Photonanotechnology for Therapeutics and Imaging by : Seok Ki Choi

Download or read book Photonanotechnology for Therapeutics and Imaging written by Seok Ki Choi and published by Elsevier. This book was released on 2020-02-14 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonanotechnology for Therapeutics and Imaging surveys major concepts and recent advances in the use of photonanotechnology with nanomaterials reported in various interdisciplinary fields, including chemistry, materials science, biomedical engineering and biomedicine. This book discusses the impact of this technology on the advancement of therapeutic modalities and imaging methods in cancers, infectious diseases and other serious diseases. Photonanotechnology studies the design principle, application and development of photoactive nanomaterials. It applies light-controlled strategies for the development of nanotherapeutics, imaging agents and diagnostic nanodevices. - Provides the latest information on photocontrolled drug delivery systems - Details how photoactive nanomaterials are designed to release reactive oxygen species (ROS) for photodynamic therapy (PDT) - Explains how photoactive nanomaterials have the ability to induce surface plasmonic heating for photothermal therapeutic (PTT) effects

Laser Induced Damage in Optical Materials, 1989

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Publisher :
ISBN 13 :
Total Pages : 686 pages
Book Rating : 4.:/5 (321 download)

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Book Synopsis Laser Induced Damage in Optical Materials, 1989 by : Harold Earl Bennett

Download or read book Laser Induced Damage in Optical Materials, 1989 written by Harold Earl Bennett and published by . This book was released on 1990 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Laser Induced Damage in Optical Materials:

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Publisher : ASTM International
ISBN 13 :
Total Pages : 672 pages
Book Rating : 4./5 ( download)

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Book Synopsis Laser Induced Damage in Optical Materials: by : Arthur H. Guenther

Download or read book Laser Induced Damage in Optical Materials: written by Arthur H. Guenther and published by ASTM International. This book was released on 1977 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Laser Induced Damage in Optical Materials

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Publisher :
ISBN 13 :
Total Pages : 676 pages
Book Rating : 4.P/5 (24 download)

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Book Synopsis Laser Induced Damage in Optical Materials by :

Download or read book Laser Induced Damage in Optical Materials written by and published by . This book was released on 1989 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optically Stimulated Luminescence Dosimetry

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Publisher : Elsevier
ISBN 13 : 008053807X
Total Pages : 375 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Optically Stimulated Luminescence Dosimetry by : L. Boetter-Jensen

Download or read book Optically Stimulated Luminescence Dosimetry written by L. Boetter-Jensen and published by Elsevier. This book was released on 2003-10-24 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Handbook of II-VI Semiconductor-Based Sensors and Radiation Detectors

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Publisher : Springer Nature
ISBN 13 : 3031240006
Total Pages : 700 pages
Book Rating : 4.0/5 (312 download)

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Book Synopsis Handbook of II-VI Semiconductor-Based Sensors and Radiation Detectors by : Ghenadii Korotcenkov

Download or read book Handbook of II-VI Semiconductor-Based Sensors and Radiation Detectors written by Ghenadii Korotcenkov and published by Springer Nature. This book was released on 2023-03-30 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reference provides interdisciplinary discussion for diverse II-VI semiconductors with a wide range of topics. The third volume of a three volume set, the book provides an up-to-date account of the present status of multifunctional II-VI semiconductors, from fundamental science and processing to their applications as various sensors, biosensors, and radiation detectors, and based on them to formulate new goals for the further research. The chapters in this volume provide a comprehensive overview of the manufacture, parameters and principles of operation of these devices. The application of these devices in various fields such medicine, agriculture, food quality control, environment monitoring and others is also considered. The analysis carried out shows the great potential of II-VI semiconductor-based sensors and detectors for these applications. Considers solid-state radiation detectors based on semiconductors of II-VI group and their applications; Analyzes the advantages of II-VI compounds to develop chemical and optical gas and ion sensors; Describes all types of biosensors based on II-VI semiconductors and gives examples of their use in various fields.

Diagnostics for Experimental Thermonuclear Fusion Reactors 2

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Publisher : Springer Science & Business Media
ISBN 13 : 1461553539
Total Pages : 615 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Diagnostics for Experimental Thermonuclear Fusion Reactors 2 by : Peter E. Stott

Download or read book Diagnostics for Experimental Thermonuclear Fusion Reactors 2 written by Peter E. Stott and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book of proceedings collects the papers presented at the workshop on "Diagnostics for Experimental Fusion Reactors" held at Villa Monastero, Varenna (Italy) September 4-12, 1997. This workshop was the seventh organized by the International School of Plasma Physics "Piero Caldirola" on the topic of plasma diagnostics and the second devoted to the diagnostic studies for the International Thermonuclear Experimental Reactor (ITER). The proceedings of the first workshop on ITER diagnostics were published by Plenum Press in 1996 with the title "Diagnostics for Experimental Thermonuclear Fusion Reactors". While many of the ideas and studies reported in the first workshop remain valid, there has been sub stantial progress in the design and specification of many diagnostics for ITER. This moti vated a second workshop on this topic and the publication of a new book of proceedings. ITER is a joint venture between Europe, Japan, Russia and USA in the field of con trolled thermonuclear fusion research. The present aim of ITER is to design an experimental fusion reactor that can demonstrate ignition and sustained burn in a magnetically confined plasma. To achieve this goal, a wide range of plasma parameters will have to be measured reliably. It is also anticipated that diagnostics will be used much more extensively as input to control systems on ITER than on present fusion devices and this will require increased relia bility and long-term stability.