Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"X-ray source"”.
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Development of a flat-panel x-ray source
<p>"A novel flat-panel transmission type X-ray source was developed for both medical and industrial use. Depending on the geometry of the given situation, the flat-panel X-ray source could be used in tomography, radiography or tomosynthesis. Furthermore, the unit could be used as a portable X-ray …
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Design of x-ray source for real-time computed tomography
… (CT) drives the current research for multisource CT. Due to their compact nature, the current multisource systems utilize stationary angled anodes. Unfortunately, these configurations neither simplify the imaging geometry, nor satisfy the need for managing the high thermal loads demanded by …
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Observations from a Long Duration X-Ray Source for Laboratory Astrophysics
… characterization of a long-duration, broadband x-ray flux source forlaboratory astrophysics experiments. The experiments were done at the OMEGA EP high-power laser facility. This is a four-beam laser system that can deliver up to 4.4 kJ of UV laser energy in pulses of 10 ns duration. By driving …
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Dosimetric characterization of a miniature x-ray source for biophysics studies
… this project it is proposed to use a miniature X-Ray source (Mini-X) to simulate tritium radiation and characterise these low energy X-Ray beams with the aim of investigating the relative biological effectiveness of low energy electrons. The scope of this study is to design and characterize low …
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Designing a nanoscale x-ray source: towards single molecule x-ray scattering
… the design and construction of a femtosecond X-ray source based on high harmonic generation in an argon filled hollow capillary waveguide. The system has demonstrated excellent efficiency at generating harmonics in the range 20-50 eV and is tuneable by exploiting the ionization-induced …
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Unveiling the X-ray Source Population of the Barred Spiral Galaxy NGC 2336
We present a comprehensive study of the X-ray source population in the nearby spiral galaxy NGC 2336, based on nine Chandra observations spanning a 7-month period. A total of 32 X-ray sources were detected down to a limiting luminosity of ∼ 1.4 × 1038 erg s−1 in the 0.5–7.0 keV (broad) energy band. …
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Experimental test of the inverse compton effect hypothesis for the x-ray source in Scorpius
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1964.
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Noncollective X-Ray Thomson Scattering Diagnostic Development Based On A Titanium Hybrid X-Pinch X-Ray Source
X-ray Thomson scattering (XRTS) is the combination of elastic Raleigh scattering and inelastic Compton scattering observed from high density systems using energetic probe energies at the keV x-ray level. Thermal x-ray probes have historically been created by delivering 1014 [-] 1016 W/cm2 to a …
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Joint-optimization of the x-ray source voltage, beam filtration and detection angle for a full-ring benchtop x-ray fluorescence computed tomography (XFCT) image system
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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The impact alteration of X-ray source subject projection geometry has on the ability to detect demineralisation in occlusal cavities using digital subtraction radiography: an in-vitro study
… to investigate in-vitro, whether alteration of X-ray source subject projection geometry affected the accuracy and reproducibility of DSR for detecting demineralisation in artificially created occlusal cavities. The discriminatory ability and reproducibility of a grading system for assessing …
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Design and applications of cold-cathode X-ray imaging systems
X-ray computed tomography (CT) and planar x-ray imaging are mainstays of modern clinical care. The electron generation mechanism in standard x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed …
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Model for precise detection of bone edges
… thesis. This model is derived by assuming the X-ray source to be a square region. It is shown that for an ideal X-ray source (point source), the bone edge lies exactly at the location of maximum first derivative of the imaged object's transmission function. However, for the non-ideal case, it is …
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A study of the long-term behavior of galactic X-ray sources with RXTE
… of the long-term behavior of galactic X-ray sources using the 4.5-year database of the All Sky Monitor (ASM), and pointed observations made with the Proportional Counter Array (PCA) on board the Rossi X-ray Timing Explorer (RXTE). I have conducted a systematic search through the ASM data …
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Inverse Compton Light Source: A Compact Design Proposal
… demand for a compact Inverse Compton Light Source (ICLS) which is capable of producing high-quality X-rays by colliding an electron beam and a high-quality laser. It is only in recent years when both SRF and laser technology have advanced enough that compact sources can approach the quality …
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Experimental Investigation of Sheared Flow Stabilization of Z-pinches
The wire array z-pinch is an efficient x-ray source [1] which has been proposed for use in indirect drive inertial confinement fusion schemes [2]. The z-pinch can become a more efficient x-ray source if its stability is improved. Cylindrical wire array z-pinch experiments where the Rayleigh-Taylor …
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Bremsstrahlung radiation and fast electron transport in laser-plasma interactions
… in order to generate a bright bremsstrahlung source. Throughout the work the focus has been, firstly, to better understand the process behind the generation of x-rays within solid target interactions and, secondly, to apply this understanding to radiography of industrial samples. Across three …
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Low energy photon mimic of the tritium beta decay energy spectrum
… of tritium, so that a surrogate photon source can be used for biophysics experiments. Through experimental and computational means, this work has explored the use of characteristic x-rays of various materials to modify the output spectrum of an x-ray source, such that it mimics the …
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Development of a motion-free tomographic imaging system
… a module containing multiple miniature x-ray source that would allow for CT scanners to be significantly lighter weight and cheaper, and to operate without any moving parts. This could expand access to this valuable diagnostic tool to rural and low-income communities, emergency medicine, …
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Pyroelectric crystal-based X-ray diffractometer
We investigate the use of an Amptek Cool-X X-ray Generator for an instructional tool in the physics of x-rays, as well as a source for x-rays for crystal diffraction experiments. The x-ray source is a solid-state two-phase air-cooled source with a time-varying photon output. Two detectors are used …
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