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 19 of 19 for “"gamma ray spectroscopy"”.
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Solar flare gamma-ray spectroscopy with CGRO-COMPTEL
<p>The X-ray and gamma-ray emission from solar flares provides important information about high-energy particles in solar flares. Energetic protons and ions interact with the solar atmosphere, giving rise to nuclear line emission at MeV energies and higher energy photons from the decay of neutral …
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Gamma-ray spectroscopy of excited states in ¹⁷⁷Hf and ¹⁸²W
Thesis (M.S.)--Michigan State University. Dept. of Chemistry, 1974
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Gamma-Ray Spectroscopy Following High-Flux 14-Mev Neutron Activation
… Facilities and procedures necessary for gamma-ray spectroscopy of samples irradiated at the RTNS-I were developed.
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Nondestructive analyses of irradiated MITR fuel by gamma-ray spectroscopy.
Massachusetts Institute of Technology. Dept. of Nuclear Engineering. Thesis. 1966. Sc.D.
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A study of nuclear energy levels in ¹²¹Sb, ¹²³Sb and ¹²⁷I using [beta]-ray and [gamma]-ray spectroscopy
Thesis (Ph. D.)--Michigan State University. Dept. of Physics and Astronomy, 1966
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Automated isotope identification and quantification using artificial neural networks
… identify and quantify isotopes in low-resolution gamma-ray spectra in a wide range of realistic conditions. Trained gamma-ray spectroscopists typically rely on intuition when identifying isotopes in spectra. A trained gamma-ray spectroscopist can inject their intuition into pattern recognition …
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Source receptor modeling of airborne particles collected over the Great Lakes
… focus was made to utilize Compton suppression gamma-ray spectroscopy and epithermal irradiations to enhance the detection limits of neutron activation analysis. These vanguard techniques allowed for the determination of trace elements at very low levels. Advancements were also made for the …
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Analysis of surrogate post-detonation urban debris (SPUD) gamma rays and self-attenuation
… Texas at Austin TRIGA reactor, then analyzed via gamma-ray spectroscopy for short-lived, medium-lived and long-lived fission and activation products. Upon completion of gamma-ray analysis, a self-attenuation analysis used to model the efficiency of a High-Purity Germanium detector (HPGe) as a …
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KMESS: an open source software package using a semi-empirical mesh-grid method for the modeling of germanium detector efficiencies
Traditional approaches in gamma-ray spectroscopy for determining the absolute full-energy peak efficiencies of germanium detectors are primarily either too time consuming or not economically viable. In addition, these approaches are difficult to use for arbitrary source shapes and counting …
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An analytic-deliberative process for the selection and deployment of radiation detection systems for shipping ports and border crossings
… portal monitors (RPMs) capable of passive gamma-ray spectroscopy that would allow 100% radiological screening without detrimental affects on the stream of commerce through the terminals. However, the Cost-Benefit Analysis (CBA) supporting the DNDO decision-making process has been criticised …
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MOBILE, HYBRID COMPTON/CODED APERTURE IMAGING FOR DETECTION, IDENTIFICATION AND LOCALIZATION OF GAMMA-RAY SOURCES AT STAND-OFF DISTANCES
… the presence of large dynamic backgrounds. The Raytheon-Tri-Modal Imager (TMI) is a mobile truck-based, hybrid gamma-ray spectroscopic and imaging system able to quickly detect, identify and localize, radiation sources at standoff distances through improved sensitivity provided by multiple …
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Flow and mixing studies in a co-rotating intermeshing twin screw extruder
… NnO2 was used as a tracer and detected by gamma ray spectroscopy giving more reproducible results than added barytes estimated gravimetrically after ashing. Shock cooling of the extruder and sectioning of the solidified compound in the screw channels was used to-study the flow mechanism. …
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Design of experimental systems for a liquid-fueled molten salt reactor
… This procedure considers the combination of gamma, alpha, optical, electrochemical and mass measurements as sufficient for developing broad knowledge of the changing properties of the operating reactor. Reactor operators with the information from these measurements will be able to better …
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Automated isotope identification algorithms for low-resolution gamma spectrometers
… method is demonstrated on a broad variety of gamma-ray spectra, ranging from small calibration sources ($<$ 1 $\mu$Ci) to Category I quantities of special nuclear material. This algorithm is also benchmarked against the ANSI N42.34-2006 Standard for Handheld Identifiers as a part of the …
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Bayesian algorithms for automated isotope identification
Handheld radio-isotope identifiers (RIIDs) are widely used in the United States for nuclear security, but these detectors generally have poor performance in isotope identification. While much research is being conducted on alternative detector materials, there is much evidence that the primary …
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Radionuclide concentrations and radiation hazard assessment in the soil of Otjiwarongo, Namibia
… of Otjiwarongo, Namibia, have been studied by gamma ray spectroscopy. The town was divided into ten geographical areas and five soil samples were collected across each area. The samples were dried, homogenized and 500 g of each sample was placed in a clearly-labelled 500 mL polythene bottle and …
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NUCLEAR DEFORMATION IN FISSION FRAGMENTS STUDIED WITH NOVEL IMPLEMENTATIONS OF DOPPLER SHIFT LIFETIME MEASUREMENT TECHNIQUES
… with an active fis- sion target coupled to an array of germanium detectors. The nuclei have been populated via neutron-induced fission on 235 U, dissolved in a liquid scintillator (fission tag via active target). This reaction, combined with a high-resolution gamma detection system, has al- lowed …
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Double-Beta Decay of 96Zr and Double-Electron Capture of 156Dy to Excited Final States
… Facility to provide shielding from cosmic rays. The first search is for the two-neutrino double-beta decay of 96Zr to excited final states of the daughter nucleus, 96Mo. As a by product of this experiment, the beta decay of 96Zr was also investigated. Two coaxial high-purity germanium …
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Search for Collective Strutures in the 186Os And 150Gd Nuclei
… and150Sm(4He, 4n)150Gd reactions.The AFRODITEγ-ray spectrometer was used for detection ofγ-ray energies emittedduring the experiments.The decay scheme of186Os has been improved. In particular, a total of 21 newγ-raytransitions have been added to the level scheme of186Os. Most importantly, …