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 29 for “"Radiation Detectors"”.
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Pixellated radiation detectors for scientific applications
… of two classes of science grade imaging radiation detectors. The first class is Monolithic Active Pixel Sensors (MAPS). The advances in CMOS fabrication technologies over the last four decades allowed MAPS to compete with Charge-Coupled Devices (CCD) in many applications. The technology …
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Heat Transfer Issues in Thin-Film Thermal Radiation Detectors
The Thermal Radiation Group at Virginia Polytechnic Institute and State University has been working closely with scientists and engineers at NASA's Langley Research Center to develop accurate analytical and numerical models suitable for designing next-generation thin-film thermal radiation …
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Simulating Properties of Scintillating Integrated Fibers as Conformal Radiation Detectors
… create fibers with novel capabilities, including radiation detection when combined with elements of scintillating fiber detectors. By sensing and processing scintillation light within the fiber itself, integrated fibers could be woven into a fabric to make a rugged, conformal radiation detector. …
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EXPERIMENTAL AND COMPUTATIONAL STUDIES OF NONLINEAR QUENCHING IN MATERIALS USED AS RADIATION DETECTORS
The next generation of radiation detectors used in security scanning, medical imaging, and high energy physics applications depend on understanding the physical mechanisms that limit intrinsic energy resolution. Nonproportionality between electron energy response and the initial energy of a …
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Development of 3D Silicon radiation detectors for neutrons and high energy charged particles
… in microstructured solid-state thermal neutron detectors have been pursued. These devices feature high aspect-ratio cavities, filled with neutron converter materials, so as to improve the neutron detection efficiency with respect to coated planar sensors. In the framework of the INFN HYDE …
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Methods for Radioactive Source Localization via Uncrewed Aerial Systems
… and develop methods to integrate existing radiation detection technology with UAS capable of flying low-altitude missions. This low-altitude scanning can be achieved by combining small and lightweight radiation detectors and state-of-the-art aircraft and avionics. High resolution mapping …
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Implementation and simulation of mobile sensor networks for nuclear radiation detection
… of special nuclear materials, nuclear radiation detection plays an important role in national security applications. However, changing background radiation, shielding effects, and short collection time make radiation detection a challenging problem. Anomaly detection, source …
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Development of detectors for the monitoring of mixed radiation fields
Scintillators and solid-state radiation detectors play a crucial role in high-energy physics, medical imaging, and clinical dosimetry, where requirements such as radiation hardness, geometric flexibility, and detection efficiency are increasingly demanding. This work presents two complementary …
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Manufacturing and Characterization of Gold-Black and Prediction and Measurement of its Directional Spectral Absorptivity
… as a popular absorptive coating for thermal radiation detectors in aerospace applications. The performance and accuracy of thermal radiation detectors largely depends on the surface optical properties of the absorptive coating. If the absorptivity of the layer is directional or wavelength …
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A Model For The Absorption Of Thermal Radiation By Gold-Black
… here addresses an important topic in thermal radiation detection when gold-black is used as an absorber. Sought is a model to simulate the absorption of thermal radiation by gold-black. Fractal geometry is created to simulate the topology of gold-black. Then electrical circuits based on the …
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Radiation source detection from mobile sensor networks using principal component analysis
… is challenging because of changing background radiation, shielding effects and short collection time, especially when the radioactive materials are moving. The concept of mobile sensor networks is put forward to solve this problem. In this thesis, a small mobile sensor network is established …
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Photoluminescence study of cadmium zinc telluride
… In the current state-of-the-art CZT grown for radiation detectors, it is common to observe 5-K PL spectra dominated by donor-bound exciton emission (D 0, X). Also, a deep acceptor-bound exciton (A0, X) related to a complex associated with Cd vacancies is usually detected. Thus, it was of …
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Systems-based analysis of a ship borne approach for the detection of fissile material concealed in cargo containers
… fissile material detection where suites of radiation detectors with imaging capabilities are enclosed in standard, non-descript cargo containers and shipped in limited numbers aboard commercial containerships. Outfitted with communication hardware, these dedicated containerized units could …
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Distributed Location Estimation of a Moving Target Characterized by a Spatial Poisson Field
… a distributed sensor network composed of radiation detectors and analyze its ability to make inferences. Radiation detectors are deployed over a known area. A radiological point source is positioned in the interior of the area. Detectors take measurements of the field generated by the …
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Optical Analysis of a Linear-Array Thermal Radiation Detector for Geostationary Earth Radiation Budget Applications
The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently working to develop a new technology for thermal radiation detectors. The Group is also studying the viability of replacing current Earth …
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A system for the detection of concealed nuclear weapons and fissile material aboard cargo cotainerships
… onto the containership. A networked system of radiation detectors, aboard all inbound containerships, does not allow a concealed nuclear weapon to ever approach the U.S. homeland. This thesis describes the ship-based system in detail, outlines its capabilities and suggests possible deployment …
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Modeling and characterization of a monoenergetic gamma-ray imaging system for active interrogation applications
… small-scale and full-scale cargo containers. Radiation detectors specifically targeted for imaging in this high-intensity environment are optimized and characterized, Cherenkov-based quartz detectors and LYSO scintillating detectors are used in the final imaging system. Imaging simulations …
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Second-Surface Mirror Effects in Thin-Film Absorber Layers
The Thermal Radiation Group at Virginia Polytechnic Institute and State University has been developing analytical and numerical heat transfer models for NASA's Langley Research Center for more than 25 years. Recent versions of these models are being used in the design of the next-generation thermal …
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CENTRIFUGALLY TENSIONED METASTABLE FLUID DETECTORS FOR DETECTION OF ALPHA, NEUTRON, AND OTHER SIGNATURES OF SPECIAL NUCLEAR MATERIALS IN NUCLEAR WASTE REPROCESSING FACILITIES
… of Centrifugally Tensioned Metastable Fluid radiation Detectors (CTMFDs) as well as potential application to nuclear waste reprocessing facilities. The CTMFD operates by stretching a fluid below vacuum pressure using centrifugal mechanical tension to destabilize the fluid to the point where …
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Toward a User's Toolkit for Modeling Scintillator Nonproportionality and Light Yield
… sets an ultimate limit on energy resolution of radiation detectors. In general, anything that causes light yield to change along the particle track (e.g., the primary electron track in γ-ray detectors) contributes to nonproportionality. Most of the physics of nonproportionality lies in the …
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