Download or read book Neutron Radiography System Design and Characterization Proceedings written by Hisao Kobayashi and published by . This book was released on 1996 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Radiography System Design and Characterization written by Hisao Kobayashi and published by . This book was released on 1996 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Second International Topical Meeting on Neutron Radiography System Design and Characterization written by William A. Barletta and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Neutron Radiography System written by Wan Muhamad Saridan Wan Hassan and published by . This book was released on 2008 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Development Characterization and Application of a New Neutron Imaging Facility at the Penn State Breazeale Reactor written by Alibek Kenges and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron imaging is a powerful tool in the field of non-destructive testing that utilizes unique attenuation properties of neutrons allowing through-images of some high-density objects. The Radiation Science and Engineering Center (RSEC) has had a neutron imaging facility for the last several decades. With the installation of a new core moderator assembly and new beam ports at the RSEC -- the Penn State Breazeale Reactor (PSBR) in 2018, a dedicated neutron beam port became available for a new neutron imaging facility at RSEC (RSEC -- NIF). The initial design of the beam port designated for the RSEC -- NIF was of divergent type that needed to be upgraded by means of collimator components and filters. After a thorough investigation of existing neutron imaging facilities around the world, it has been decided to collimate the beam port with convergent and divergent collimators and to filter the gamma and neutron content with the single crystal bismuth and sapphire filters. A set of system characterization experiments were conducted at the RSEC -- NIF that confirmed the system's correspondence to a Category I facility by ASTM standards. In addition to that, the collimation ratio of the new system was measured following the procedures given in the ASTM protocols and resulted in the effective L/D ratio value between 107 and 115. The thermal flux across the exit surface from the beam port at the biological shield was measured to be equal to 5.4E+06 n/cm^2-s at 1MWth reactor power. The application of the RSEC -- NIF's capabilities in neutron radiography (NR) and tomography (NT) techniques were demonstrated imaging different types of environmental samples for the presence and visualization of microplastic particles. Preliminary results of NT experiments conducted at the RSEC -- NIF have shown that this technique can be used as an intermediary step to visualize the content and spatial distribution of microplastics in the sand columns. Additionally, the NR capabilities of the RSEC -- NIF were utilized to visualize the microplastic particles in the sediment samples and used water filters. All obtained results and the continuation of research in this direction can potentially shed some light in the general research of microplastic transport mechanisms in different terrestrial and aquatic ecosystems.

Download or read book Recueil Documentation sur Philippe Artias written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Neutron Radiography 3 written by Shigenori Fujine and published by Springer. This book was released on 1990-07-31 with total page 1046 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Third World Conference held in Osaka, Japan, May 14-18, 1989

Download or read book Neutron Radiography written by John P. Barton and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Second World Conference, Paris, France, June 16-20, 1986

Download or read book Characterization of a Neutron Imaging Platform Utilizing a Compact Electronic Neutron Generator for Evaluation of Analog and Digital Neutron Imaging Methods and Techniques written by Michael James Taylor and published by . This book was released on 2019 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike X-Rays that interact strongly with the electron cloud surrounding atoms, neutrons interact very weakly with these electrons, but quite strongly with the nucleus of the atom. X-Rays follow a nearly linear trend of decreasing transmission as the atomic number of the element increases. Neutrons follow no such behavior and certain isotopes of elements such as lithium, boron, cadmium, and gadolinium interact very strongly with neutrons, unlike dense elements such as lead or tungsten. This gives neutrons a unique probing capability where X-Rays do not suffice. Neutron imaging is widely used in the commercial sector for munitions and critical aerospace component inspection as well as in the research realm for biological forensics, cultural heritage providence studies, and capturing repetitive processes such as cyclical fluid motion in rotating motors. Current neutron sources are typically nuclear reactors and spallation sources that provide incredibly high neutron yields and flux for the images, leading to reduced image times and/or high spatial resolution as well as new imaging techniques such as computed tomography, polarized neutron imaging, and phase contrast imaging. However, such sources are very expensive, require thorough regulatory oversight, and pose biological hazards from spent nuclear materials. Smaller sources such as sealed tube deuterium-deuterium or deuterium-tritium sources can allow for in-field inspection at a fraction of the cost of a reactor, but don't necessarily provide fast image acquisitions or adequate image quality. This thesis explores a system that is intended to fill the space between weak portable devices and strong, costly, immobile ones. An accelerator-based neutron generator has been designed and manufactured by Phoenix LLC in Madison, WI. This system operates on the principle of deuterium-deuterium fusion, which releases a free 2.45MeV (nominal) neutron in the fusion process. The system can be installed and commissioned in different locations throughout its lifetime and provides for in-field or commercial inspection of components. It has a neutron yield several orders of magnitude higher than sealed-tube neutron sources. The goal herein was to: enhance the performance of the neutron generator through careful beamline design from the source to the target to obtain the maximum neutron yield, optimize the geometry of the neutron moderator and collimator to maximize the imaging metrics of a thermalized and collimated neutron beam free of background gamma and fast neutron radiation contamination, and find efficient neutron detector solutions that can capture high-quality neutron images. Monte Carlo simulations were extensively employed for these optimization efforts. The system has been shown to produce high quality neutron radiographs in terms of contrast, noise, and resolution, using many different techniques for imaging. Many materials were explored for moderation and shielding, and many neutron detectors were researched and experimented with to demonstrate advantages and disadvantages for their use on the Phoenix neutron imaging system. Sample images will be shown and discussed including conventional radiography using medical, industrial, and photographic film, 2-dimension digital imaging using pixelated cameras such as Charge Coupled Devices (CCD), Complementary Metal Oxide Semiconductors (CMOS), amorphous Silicon (aSi), and Computed Radiography (CR). Neutron Computed Tomography (nCT) is demonstrated as a 3-dimensional imaging technique as well. Case studies will be discussed and options for further optimization for collimator, moderator, and detector designs will be outlined. Recommendations for future research will be discussed in the final chapter.

Download or read book Analysis and Design of an Improved Neutron Radiography Facility at the M I T Research Reactor written by Robert Henry Smith and published by . This book was released on 1981 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of an Accelerator Neutron Source Based on the Be d N Reaction written by and published by . This book was released on 1992 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small accelerator neutron sources offer considerable potential for applied neutron radiography applications. Among the desirable features are relatively low costs, limited operating hazards, opportunities for tailoring primary neutron spectra, compactness and portability, and modest licensing requirements (compared to fission reactors). However, exploitation of this potential has been somewhat limited, in part, by incomplete knowledge of the primary-neutron yields and energy spectra from the favorable source reactions. This work describes an extensive experimental determination of zero-degree neutron yields and energy spectra from the 9Be(d, n) 1°B source reaction, for incident deuterons of 2.6 to 7.0 MeV on a thick beryllium metal target. This information was acquired by means of time-of-flight measurements that were conducted with a calibrated uranium fission detector. Tables and plots of neutron-producing reaction data are presented. This information provides input which will be essential for applications involving the primary spectrum as well as for the design of neutron moderators and for calculation of thermal-neutron yield factors. Such analyses will be prerequisites in assessing the suitability of this source for various possible neutron radiography applications and, also, for assisting in the design of appropriate detectors to be used in neutron imaging devices.

Download or read book High Resolution Neutron Imaging with Liglass Multicore Scintillating Fiber and Diffusion Studies to Enable Improved Neutron Imaging written by Michael Edward Moore (Physicist) and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High resolution neutron imaging is an essential tool used for fundamental characterization of novel x-ray opaque microstructures. Currently, advanced neutron scattering facilities enable users to image materials with state-of-the-art neutron radiography spatial resolutions of approximately 10-15 microns. Continued progress towards micron resolution is limited by the intensity and the linearity of available thermal neutron fluxes. This places an emphasis on increasing neutron conversion/detection efficiency while maintaining the spatial accuracy of the projected radiograph.This dissertation reports the results of experimental fabrication and characterization of a microstructured multicore 6-lithium-glass scintillating fiber as a proof-of-concept high resolution neutron imager. The approach towards micron-level thermal neutron imaging and fundamental scintillator materials research for relevant imaging technologies are presented. Fabrication trials and neutron/gamma discrimination observations for an initial square-packed multicore design are described first. Then the fabrication process used for a proof-of-concept hexagonal-packed multicore design,and an evaluation of its radioluminescence and chemical stability is presented. Scintillation characteristics of a neutron imaging face plate were estimated, and its spatial resolution was experimentally measured. The ultimate resolving power of the proof-of-concept multicore was comparable to the state-of-the-art. The impact of even higher resolution designs, with potential to track neutron conversion particles using smaller core pitch or different cladding material, is discussed. Neutron imaging often requires nonlinear detection systems that can accurately represent the spatial features of an irradiated object. While thin film and microchannel plate detectors have been heavily researched for this application, little effort has been made to create selective scintillating regions within structured silicate glass detectors. This dissertation presents the continued research of diffusing trivalent cerium in lithium loaded glass. The creation of near surface regions of scintillation with thermal diffusion of the Ce3+ activator into 6Li glass is presented, and its use for neutron imaging with a bent optical fiber taper is discussed. The activation energy of Ce within the silicate is calculated and its valance state is observed as a function of diffusion depth. The diffusion process is then adopted for use with YAP (YAlO3:Ce) for associated particle imaging applications.

Download or read book Development and characterization of a real time neutron radiographic imaging system written by John Thomas Lindsay and published by . This book was released on 1983 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Neutron Diffraction System and Neutron Imaging System for Beamport Characterization written by Troy Casey Unruh and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor neutron detector design, fabrication and testing are all performed at Kansas State University (KSU). The most prevalent neutron detectors built by the KSU Semiconductor Materials And Radiological Technologies Laboratory (SMART Lab) are comprised of silicon diodes with [superscript]6LiF as a neutron converter material. Neutron response testing and calibration of the detectors is performed in a neutron detector test facility. The facility utilizes diffraction with a pyrolytic graphite (PG) monochromator to produce a diffracted neutron beam at the northwest beamport of the KSU Training Research Isotope production General Atomics (TRIGA) Mark-II nuclear reactor. A 2-D neutron beam monitor can also be used in conjunction with the test facility for active calibrations. Described in the following work are the design, construction and operation of a neutron detector test facility and a 2-D neutron detection array. The diffracted neutron beam at the detector test facility has been characterized to yield a neutron beam with an average Gaussian energy of 0.0253 eV. The diffracted beam yields a flux of 1.2x10[superscript]4 neutrons/cm[superscript]2/s at 100 kW of reactor power. The PG monochromator is diffracting on the (002) plane that has been positioned at a Bragg angle of 15.5 degrees. The 2-D neutron detection array has been characterized for uniform pixel response and uniform neutron detection efficiency. The 2-D 5x5 array of neutron detectors with a neutron detection efficiency of approximately 0.5 percent has been used as a beam monitor when performing detector testing. The amplifier circuits for the 5x5 array were designed at the KSU Electronics Design Lab (EDL) and were coupled to a LabVIEW field-programmable gate array that is read out by a custom LabVIEW virtual instrument. The virtual instrument has been calibrated to produce a pixel response that varies by less than two percent from pixel to pixel. The array has been used for imaging and active monitoring of the diffracted neutron beam at the detector test facility. The following work is part of on-going research to develop various types of solid state semiconductor neutron detectors.

Download or read book Neutron Imaging written by Dinesh K. Aswal and published by Springer Nature. This book was released on 2022-04-12 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively presents the concepts of neutron physics and imaging including neutron properties, neutron matter interaction, neutron imaging, comparison with X-ray and physics and design of neutron sources. It discusses how neutron imaging has gained importance as a powerful non-destructive technique to understand the internal structures of materials/engineered components in wide range of industries by increasing their applicability and efficiency. The book also covers the topics of neutron optics and detectors, basic principles of neutron radiography and tomography, related standards, safety, metrology and regulations in neutron imaging. The book presents applications of neutron imaging in the areas of aerospace industry, nuclear power and manufacturing industry, materials science and engineering, geomechanics, national security, biological, and medical domain. Given its scope, the book will be highly beneficial for postgraduate students, researchers and industry professionals working in the area of engineering and physics, especially non-destructive testing and non-destructive evaluation through neutron imaging.

Download or read book Neutron Radiography Handbook written by Peter von der Hardt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiography with neutrons can yield important information not obtainable by more traditional methods. In contrast to X-rays as the major tool of visual non-destructive testing, neutrons can be attenuated by light materials like water, hydrocarbons, boron, penetrate through heavy materials like steel, lead, uranium, distinguish between different isotopes of certain elements, supply high quality radiographs of highly radioactive components. These advantages have led to multiple applications of neutron radiography since 1955, both for non-nuclear and nuclear problems of quality assurance. The required neutron beams originate from radioisotopic sources, accelerator targets, or research reactors. Energy "tailoring" which strongly influences the interaction with certain materials adds to the versatility of the method. Since about 1970 norms and standards have been introduced and reviewed both in Europe (Birmingham, September 1973) and the United States (Gaithersburg, February 1975). The first world conference on neutron radiography will take place in December 1981, in San Diego, U.S.A. . In Europe the interested laboratories inside the European Community have entered into systematic collaboration through the Neutron Radiography Working Group (NRWGl. since May 1979. This Handbook has been compiled as one of the common tasks undertaken by the Group. Its principal authors are J.C. Domanus (Ris0 National Laboratory). and R.S. Matfield (Joint Research Centre, Ispra) Major contributions have been received from R. Liesenborgs (SCK/CEN Mol) R. Barbalat (CEN Saclayl.

Download or read book Neutron Radiography written by Garbe,U. and published by Materials Research Forum LLC. This book was released on 2020-02-05 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron radiography represents a powerful non-destructive testing technique that is still very much in development. The book reveals the amazing diversity of scientific and industrial applications of this technique, the advancements of the state-of-art neutron facilities, the latest method developments, and the expected future of neutron imaging.