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 21 for “"X-ray detectors"”.
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Measurements of injected impurity transport in text using multiply filtered soft x-ray detectors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1990.
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Halide Perovskite and Metal-Organic Framework Composites for X-ray Detection
Our ability to detect X-ray radiation and generate detailed images on internal structures in a non-destructive manner, has had profound impacts on all of our lives. Whether that is through medical imaging, allowing vital diagnosis of tumours and visualisation of broken bones; through security …
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Developing an Automated Explosives Detection Prototype Based on the AS&E 101ZZ System
… development of a multi-sensor, multi-energy x-ray prototype for automated explosives detection. The system is based on the American Science and Engineering model 101ZZ x-ray system. The 101ZZ unit received was an early model and lacked documentation of the many specialized electronic …
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Development and Characterisation of Halide Perovskite Visible Light and X-Ray Detection Devices
… how efficiently we can detect it, and improving detectors will advance these technologies. Visible light and X-rays make up two regions of the electromagnetic spectra, both key bands for imaging in different modalities. The visible spectrum represents the energies we can detect with our eyes, …
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Simulation of X-ray imaging systems for luggage inspection
This thesis describes XL, an x-ray imaging simulator for luggage inspection. This software system runs on a workstation and models x-ray sources, x-ray detectors and objects between them. A simple graphical interface permits the user to specify simulation parameters and inputs. XL then uses Monte …
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Position sensitive detectors in GaAs
… of gallium arsenide position sensitive detectors. These are aimed at various applications with the original motivation being experimental particle physics. An account is given of basic semiconductor physics relevant to particle detectors. A review of electronics applicable to reading out …
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Digital radiography: image acquisition and scattering reduction in x-ray imaging.
Since the discovery of the X-rays in 1895, their use in both medical and industrial imaging applications has gained increasing importance. As a consequence, X-ray imaging devices have evolved and adapted to the needs of individual applications, leading to the appearance of digital image capture …
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X-ray power density spectra of black hole binaries : a new deadtime model for the RXTE PCA
… tool for determining the frequency content of X-ray radiation from astronomical sources. For neutron star systems, power density spectra reveal coherent oscillations for those sources that are pulsars, while quasi-periodic oscillations over a wide range of frequencies (0.01 to 1300 Hz) are used …
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Radiation management, avionics development, and integrated testing of a Class-D space-based asteroid X-ray spectrometer
The Regolith X-ray Imaging Spectrometer (REXIS) is a student designed and built payload instrument aboard NASA's OSIRIS-REx asteroid sample return mission. The interplanetary target for this mission is a primitive asteroid known as Bennu that is believed to be relatively unchanged since the …
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X-ray Induced Changes in Electronic Properties of Stabilized Amorphous Selenium Based Photoconductors
… are important materials for flat panel digital X-ray detectors. The performance of the X-ray detector is directly related to the carrier mobility and carrier-trapping lifetime of amorphous selenium and its alloy. An experiment was conducted to examine the dose rate effects on the carrier-trapping …
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Development of x-ray holography methods for structure determination : Application of high speed detectors and novel numerical methods
… the holography method is given with a focus on X-ray fluorescence holography. Methods for analysis of X-ray holographic data are also reviewed. An overview of the detectors relevant to X-ray measurements is also presented. An experimental apparatus for rapid acquisition of X-ray holographs using …
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A search for light weakly-interacting massive particles with SuperCDMS and applications to neutrino physics
… with the SuperCDMS experiment, which uses Ge detectors cooled to 50 mK to detect ionization and phonons produced by particle interactions. We perform a blind analysis of 577 kg d of exposure on 7 detectors targeting WIMPs with masses < 30 GeV/c2 , where anomalous results have been reported by …
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An Investigation of Tungsten-Based Z-Pinch Planar Wire Array and Benchmarking Experiments
Wire array z-pinches provide an accessible means to research plasmas of high density and temperature and have valuable applications in the fields of inertial confinement fusion (ICF),astrophysics, and radiation studies. The purpose of this work is tungsten/aluminum z-pinch study and to aid in the …
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Strain in Halide Perovskites: Characterisation, Crystallography, Consequences
… devices such as solar cells, LEDs, and X-ray detectors making use of halide perovskites as the light absorbing or emitting material have experienced a dramatic increase in efficiency in recent years. As a result, halide perovskite-based solar cells are now starting to make their way out of …
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Computational design of a novel soft-Xray-based turbulence diagnostic in NSTX-U
… resolutions that are attainable using Soft X-ray (SXR) imaging makes it a promising candidate. The primary objective of the thesis is to assess the feasibility of an electron temperature fluctuation diagnostic based on SXR imaging. The feasibility study involves gathering fluctuation data and …
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Charge and Thermoelectric Transport in Metal Halide Perovskite Semiconductors
… in photovoltaics, light-emitting diodes, photodetectors, X-ray detectors, and field-effect transistors (FETs). Rapid and substantial enhancements in the performance of perovskite-based optoelectronic devices have been achieved, that recent records indicate power conversion efficiency (PCE) of …
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Next generation optoelectronic devices for energy applications utilising metal oxides, bismuth oxyhalides and lead halide perovskites
Lead-halide perovskites (LHP) have rapidly emerged as a contender for commercial photovoltaic applications. Among its many advantages, one of the most important is that LHPs can be paired with silicon solar cells, which currently dominate the photovoltaics market. This is because LHP absorb in the …
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