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 10 of 10 for “"photon spectra"”.
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Two-photon spectra of Rydberg states of alkaline-earth atoms (strontium and barium)
The even-parity spectra of strontium and barium are very complex due to strong perturbation by several doubly excited configurations and this also increases discrepancies between theory and experiment in accurate level assignment and energy level and atomic structure data, particularly for the …
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Strong Magnetic Field Effects and Molecular Processes with Applications to White Dwarfs
… probability for the hydrogenlike 2s two-photon decay has been investigated and shown to increase substantially with field strength. The computed two-photon spectra show resonances and interference minima. Anomalous Zeeman depolarization features are found in computed two-photon …
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Design of an Ytterbium-169 brachytherapy source for gold nanoparticle-aided radiation therapy
… characteristics of the source. Specifically, the photon spectra, secondary electron spectra, and dose enhancement characteristics are calculated via Monte Carlo simulations to elucidate the effects on potential radiosensitization during gold nanoparticle-aided radiation therapy. Furthermore, this …
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Novel designs for undulator based positron sources
… uses a helical undulator to produce a intense photon beam that generates positrons through the pairproduction mechanism. As a helical undulator is used the photon beam is polarised and this results in polarised positrons being produced. This thesis investigates the undulator-based positron …
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Studying the background response of Minihalo for design optimizations
… and gamma-rays in the scintillators, the optical photon spectra of scintillators and the background neutrons produced inside the lead from muon interactions. The background neutron spectrum is investigated in detail in order to determine the efficiency of the detector and the necessary change to …
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Metrologia dei campi di radiazioni di bassa energia
… X-ray spectrum measurements. The pulse-height spectra were measured using a planar high-purity germanium spectrometer (HPGe) and unfolded to fluence spectra using a stripping procedure then validate with using Monte Carlo generated data of the spectrometer response. HPGe portable detector has a …
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Small and large-scale magnetic fields involved with solar flares
… are as follows: (1) results of X-ray spectral fitting indicate the nonthermal origin of X-ray emission at over ~10 keV during the impulsive phase of microfiares and the photon spectra of the microflares associated with type III bursts are generally harder than those without type III …
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Electron disintegration of helium between 45 and 100 MeV
… an IDS 920 computer. The resulting pulse height spectra exhibited distinct peaks corresponding to tritons, deuterons, protons and 3He fs. The data were analyzed using virtual photon spectra to- yield photodisintegration, cross sections corresponding to the reaction 4He (y,h)3He . The resulting …
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Understanding The Influence of Photon Energy On 6Mv Non Reference Dosimetry and Ct Dosimetry Using Tld and Osld
… using TLD and OSLD generally assume a constant photon energy spectrum within a nominal beam energy regardless of measurement location, tissue composition, or changes in beam parameters. Variations in the energy spectrum of therapeutic photon beams may impact the response of TLD and OSLD and …