Microfocal Radiography
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Microfocal Radiography
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Author : R. V. Ely
language : en
Publisher:
Release Date : 1980
Microfocal Radiography written by R. V. Ely and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Science categories.
Measuring Microfocal Spots Using Digital Radiography
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Author :
language : en
Publisher:
Release Date : 2009
Measuring Microfocal Spots Using Digital Radiography written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Measurement of microfocus spot size can be important for several reasons: (1) Quality assurance during manufacture of microfocus tubes; (2) Tracking performance and stability of microfocus tubes; (3) Determining magnification is especially important for digital radiography where the native spatial resolution of the digital system is not adequate for the application; and (4) Knowledge of unsharpness from the focal spot alone. The European Standard EN 12543-5 is based on a simple geometrical method of calculating focal spot size from unsharpness of high magnification film radiographs. The following equations are used for the focal spot size measurement: By similar triangles the following equations are presupposed: f/a = U/b and M = (a+b)/a. These equations can be combined to yield the well known expression: U = f(M - 1). Solving for f, f = U/(M-1). Therefore, the focal spot size, f, can be calculated by measuring the radiographic unsharpness and magnification of a known object. This is the basis for these tests. The European standard actually uses one-half of the unsharpness (which are then added together) from both sides of the object to avoid additional unsharpness contributions due to edge transmission unsharpness of the round test object (the outside of the object is measured). So the equation becomes f = (1/2 U1 + 1/2 U2)/(M-1). In practice 1/2 U is measured from the 50% to the 90% signal points on the transition profile from ''black'' to ''white, '' (positive image) or attenuated to unattenuated portion of the image. The 50% to 90% points are chosen as a best fit to an assumed Gaussian radiation distribution from the focal spot and to avoid edge transmission effects. 1/2 U1 + 1/2 U2 corresponds about to the full width at half height of a Gaussian focal spot. A highly absorbing material (Tungsten, Tungsten Alloy, or Platinum) is used for the object. Either wires or a sphere are used as the object to eliminate alignment issues. One possibility is to use the wires in the ASTM E2002 unsharpness gage and take two orthogonal images. The signal levels in the image need to be linear with radiation exposure and so may need conversion if a nonlinear detector is used to acquire the image.
Guidebook For Radiography
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Author : Paresh R. Vaidya
language : en
Publisher: Springer Nature
Release Date : 2023-12-05
Guidebook For Radiography written by Paresh R. Vaidya and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-12-05 with Science categories.
This book is a complete and compact manual on the radiographic testing. It covers every aspect of the test method including radiation safety and its modern techniques. It is specifically designed as a quick guide and reference manual for field engineers. There are chapters on basic physics of radiation, radiographic equipment, radiographic film and screen, radiography application and techniques, among others. The contents also include pedagogical features such as end-of-chapter numerical problems and chapters on ‘How to write Procedure for Testing’ and ‘How to write Instructions for Testing’ which are practical tips that are not found in standard textbooks. This book is a useful resource for professionals and researchers in the areas of radiography and radiometry.
Practical Non Destructive Testing
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Author : Baldev Raj
language : en
Publisher: Woodhead Publishing
Release Date : 2002
Practical Non Destructive Testing written by Baldev Raj and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
This comprehensive book covers the five major NDT methods - liquid penetrants, eddy currents, magnetic particles, radiography and ultrasonics in detail and also considers newer methods such as acoustic emission and thermography and discusses their role in on-line monitoring of plant components. Analytical techniques such as reliability studies and statistical quality control are considered in terms of their ability to reduce inspection costs and limit down time. A useful chapter provides practical guidance on selecting the right method for a given situation.
Measuring Microfocus Focal Spots Using Digital Radiography
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Author :
language : en
Publisher:
Release Date : 2009
Measuring Microfocus Focal Spots Using Digital Radiography written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Methods In Bone Biology
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Author : T. Arnett
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-06-02
Methods In Bone Biology written by T. Arnett and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-02 with Science categories.
Methods in Bone Biology is unique in being devoted to describing the methodology used by bone researchers. This book describes in detail the techniques of cell and organ culture used in the study of bone and bone cell function and the techniques used to monitor the skeleton and skeletal remodelling both in clinical and experimental settings.
Handbook On Radiation Probing Gauging Imaging And Analysis
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Author : E.M. Hussein
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-05-05
Handbook On Radiation Probing Gauging Imaging And Analysis written by E.M. Hussein and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-05-05 with Technology & Engineering categories.
The need for this book arose from my teaching, engineering, and - search experience in the non-power aspects of nuclear technology. The lack of a comprehensive textbook in industrial applications of radiation frustrated my students, who had to resort to a multitude of textbooks and research publications to familiarize themselves with the fundam- tal and practical aspects of radiation technology. As an engineer, I had to acquire the design aspects of radiation devices by trial-and-error, and often by accidental reading of a precious publication. As a researcher and a supervisor of graduate students, I found that the needed literature was either hard to find, or too scattered and diverse. More than once, I discovered that what appeared to be an exciting new idea was an old concept that was tried a few decades earlier during the golden era of “Atom for Peace”. I am hoping, therefore, that this book will serve as a single comprehensive reference source in a growing field that I expect will continue to expand. This book is directed to both neophytes and experts, and is written to combine the old and the new, the basic and the advanced, the simple and the complex. It is anticipated that this book will be of help in - viving older concepts, improving and expanding existing techniques and promoting the development of new ones.
Magnification Radiography
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Author : A.S. Takahashi
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Magnification Radiography written by A.S. Takahashi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
If the early stages of a disease begin with the involvement of a small area of cells or tissue, the early diagnosis of pathologic changes by means of radio graphy should concentrate first on the detection of such minute changes. The ideal solution would be to produce X-ray images of findings much finer than those observable by the naked eye, and herein lies a new field of research that is believed to be worth developing. The introduction of a 0.3 mm focal-spot rotating-anode tube about 25 years ago opened the way to the clinical application of magnification radiography. Due to the postwar economic situation, we were unable to import this type of X-ray tube, but we believed in the importance of magnification radiography in X-ray diagnosis, and in 1952 we produced an X-ray tube with a 0.15 mm focal spot by reconstructing an existing fixed-anode tube. This X-ray tube has been improved step by step, so that tubes with focal spots of 0.1 mm or 0.05 mm are now available in Japan. Thus it has become possible to obtain 4 to 6 x magnification images of minute lesions that could not be imaged by normal roentgenography.
General Radiography
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Author : Christopher M. Hayre
language : en
Publisher: CRC Press
Release Date : 2020-07-15
General Radiography written by Christopher M. Hayre and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-15 with Medical categories.
With chapters from globally recognized academics, General Radiography shows the multifaceted approach to general radiography and how it enhances healthcare delivery. Potentially influential to how healthcare delivery is offered, it begins with the pertinent chapters examining image acquisition and dose optimization in diagnostic radiography. Next, chapters reflect and critically discuss aspects central to patient care, and imaging within trauma, critical care and pediatric situations. The final section of this book then explores the learning, teaching and education in the field of diagnostic radiography, with novel strategies illustrated.
Radiography And Radiation Testing
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Author : Lawrence E. Bryant
language : en
Publisher:
Release Date : 1985
Radiography And Radiation Testing written by Lawrence E. Bryant and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Science categories.