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 7 of 7 for “"gamma lines"”.
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A novel low-dose approach to active detection of shielded high-Z materials
… demonstrates that multiple mono-energetic gamma lines produced from low threshold, high-Q nuclear reactions can be used to detect the presence of high-Z material shielded in low- and medium-Z cargo. Specifically, this work establishes a research foundation to inform the eventual development …
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Development of a New Ca II H and K Spectrophotometric Temperature Index
… temperature index based on the Ca II H and K lines. Because these lines are present even in very cool stars and because the Ca II H line is blended with the H-epsilon line in hot stars, this index should cover a very broad range of spectral types. Our data set consisted of 95 stars with …
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Determination of thermal neutron capture gamma yields.
… of analysing Ge(Li) thermal neutron capture gamma spectra to obtain total gamma yields has been developed. Tie method determines both the yields from the well resolved gamma peaks in a spectrum as well as the gamma yields from the unresolved gamma lines which appear in the continuum portion …
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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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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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Supernovae as gamma ray emitters from the MeV to the TeV
"Gamma rays offer unique probes of supernovae as cosmic-ray accelerators and as nucleosynthesis sites. My thesis work focuses on how to explore these two aspects of supernovae. (1) Both starburst galaxies and ultra luminous infrared galaxies are new gamma-ray source classes discovered by Fermi and …
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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 …