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 17 of 17 for “"Gamma spectroscopy"”.
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Phoswich beta-gamma spectroscopy
Call number: LD2668 .T4 NE 1987 M66
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Gamma spectroscopy by artificial neural network coupled with MCNP
… was employed to identify five elements from gamma spectra. In quantitative analysis, better results were obtained when the neural fitting tool in MATLAB was used. As a training function, Levenberg-Marquardt algorithm was used with 23 neurons in the hidden layer with 259 gamma spectra in the …
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Behavior and measurement of distributed sources in a shielding matrix using gamma spectroscopy
… passive neutron detection in conjunction with gamma spectroscopy exist to assay these waste materials, these methods are expensive and not readily available at any given facility. As a result, less expensive alternatives, such as gamma spectroscopy alone, are often used. This paper researches …
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A new prompt gamma spectroscopy-based approach for range verification in proton therapy
… in-vivo range monitoring is based on the prompt gammas (PGs) detection from nuclear de-excitation due to beam interactions in the tissue. The adjective prompt reflects the fact that they are emitted just a few pico-nano seconds after the impact of the proton on the target nucleus. The PGs …
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Measurement of spallation residuals in mercury for accelerator facility targets
… and longer-lived spallation residuals using gamma spectroscopy at various decay times up to a year were determined. The measured cross sections were then compared with predicted cross sections from the MCNPX code. After acquisition of the gamma spectroscopy data the targets were drained and …
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The contribution of construction materials to the airborne radon concentrations in an underground facility
… were quantified and compared to each other. Gamma spectroscopy measurements resulted in an average 222Rn concentration to be 0.038 +/- 0.0011 and 0.014 +/- 0.001 Bq g-1 for the native material and fiber crete, respectively. The emanation of 222Rn from the host material was measured via lucas …
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DESIGN, DEVELOPMENT AND VALIDATION OF NOVEL ELECTRICAL CONTACTING SYSTEMS, MECHANICAL ENCAPSULATION SOLUTIONS AND HIGH-RESOLUTION INTEGRATED CHARGE-SENSITIVE PREAMPLIFIERS FOR ADVANCED HIGH-PURITY GERMANIUM DETECTORS
… Germanium detectors are widely used in modern gamma spectroscopy experiments due to their outstanding energy resolution and precise position sensitivity. However, detailed technical and manufacturing specifications for these detectors are typically proprietary, as they are provided by …
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The Use of Radionuclides to Identify Vulnerable Fractured and Karst Bedrock Aquifers in Eastern Ontario
… of Alfred & Plantagenet in Ontario, Canada. Gamma spectroscopy was used to analyze the samples and quantify the presence of the radionuclides in cps and cps/g. The spectral data indicate no significant difference in the activities of ²¹⁰Pbₑₓ among samples, but a significant difference in the …
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Autonomous detection and characterization of nuclear materials using co-robots
… materials that are found using neutron and gamma spectroscopy. The vehicles were tested in several scenarios which included obstacles, multiple sources, and shielding of the sources to determine the practicality of these co-robots. The evaluation of these co-robots was critical, as the …
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Applications of machine learning in nuclear imaging and radiation detection
… machine learning models is presented for gamma spectroscopy at a wide variety of testing conditions. Moreover, Hybrid Neural Network (HNN) was developed specifically for gamma-ray spectra data. Three different methods for feature extraction were tested as well. Experiments on MCNP …
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An evaluation of the natural radioactivity in the soils of Okahandja and Karibib, Namibia
… of Karibib and Okahandja have been studied by gamma spectroscopy. Each town was divided into ten geographical areas and five soil samples were collected across each area. These samples were processed and placed in well-labelled 500 ml plastic bottles. A High Purity Germanium detector (HPGe) was …
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Spektroskopie der Oktupolkorrelationen von 231Pa und 229Pa mit adaptierten Koinzidenzteilchendetektorsystemen
… with Compton-suppressed and background-reduced-gamma spectroscopy following Coulomb-excitation was developed for the NORDBALL gamma-spectrometer of the Niels Bohr Institute Tandem Accelerator Laboratory, Risø (Denmark). An optional extension of the detector system, built by the University of …
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NUCLEAR COLLECTIVE MODES AT FINITE TEMPERATURE AS A PROBE OF NUCLEAR STRUCTURE AND DYNAMICS
… nuclear structure and reaction dynamics through gamma-spectroscopy measurements in fusion-evaporation reactions. The gamma emission associated with the Dynamical Dipole (DD) mode and the Giant Dipole Resonance (GDR) is a very good tool to study the role of the nuclear interaction in …
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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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A High-Resolution Time-of-Flight Spectrometer for Fission Fragments and Ion Beams
… to investigate their structure by means of beta-gamma spectroscopy. 2. For the purpose of fission-fragment detection a double time-of-flight (TOF) spectrometer has been developed. The key component of the TOF spectrometer is a TOF detector consisting of multichannel-plate (MCP) detectors with a …
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Sviluppo di un nuovo approccio per la quantificazione in tempo reale dell'attività dei radiofarmaci.
… marcato con un radionuclide emettitore di raggi gamma o positroni nel corpo per ottenere immagini diagnostiche. Questi radionuclidi vengono utilizzati anche a scopo terapeutico. Due comuni modalità di imaging in medicina nucleare sono la Tomografia ad Emissione di Positroni (PET) e la Tomografia …
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Environmental Impacts on the Development and Dune Activity of Oxbow Lake along the Southwest Coast of Lake Michigan at Saugatuck, Michigan USA
Coastal dunes of Lake Michigan and corresponding down-wind lakes are studied for links between dune activity and climatic forcing; to date, little is certain about climate control on dune activity. By unveiling relationships between climate variables and dune activity, it becomes possible to …