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The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques
Bibliography: pages 128-129.
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| Format: | Thesis |
| Language: | English |
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Department of Physics
2016
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| _version_ | 1867613241979437056 |
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| access_status_str | Open Access |
| author | Padayachee, Jayanethie |
| author2 | Prozesky, Victor M |
| author_browse | Padayachee, Jayanethie Prozesky, Victor M |
| author_facet | Prozesky, Victor M Padayachee, Jayanethie |
| author_sort | Padayachee, Jayanethie |
| collection | Thesis |
| description | Bibliography: pages 128-129. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/16143 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:01.081Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Physics |
| publisherStr | Department of Physics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/16143 The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques Padayachee, Jayanethie Prozesky, Victor M Britton, David T Physics Bibliography: pages 128-129. The elimination of some blurring property, such as the detector response function, from spectra has received a considerable amount of attention. The problem is usually complicated by the presence of noise in the data, and in general, there exists an infinite set of possible solutions which are consistent with the data within the bounds imposed by the noise. Such a problem is known, generally, as an ill-defined inverse problem. Many techniques have been developed in an attempt to solve inverse problems, for example the problem of deconvolution, but these techniques employ ad hoc modifications to solve different problems. Bayesian Statistics has been proved to be the only consistent method for solving inverse problems of the type where the information is expressed in terms of probability distributions. This dissertation presents results of applying the Bayesian formalism, together with the concepts of maximum information entropy and multiresolution pixons, to various inverse problems in ion beam analysis; The results of this method of deconvoluting Rutherford Backscattering Spectrometry (RBS) and Proton Induced X-ray Emission (PIXE) spectra are compared to the results from other deconvolution techniques, namely Fourier Transforms, Jansson's method and maximum entropy (MaxEnt) without pixons. All the deconvolution techniques show an improvement in the resolution of the RBS spectra but only the MaxEnt techniques show a significant improvement in the resolution of the PIXE spectra. The MaxEnt methods also produce physically acceptable results. The MaxEnt formalism was applied to the extraction of depth profiles from RBS and PIXE spectra and yielded good results. The technique was also used to deconvolute the beam profile from one-dimensional nuclear microprobe scans. 2016-01-02T04:53:02Z 2016-01-02T04:53:02Z 1997 Master Thesis Masters MSc http://hdl.handle.net/11427/16143 eng application/pdf Department of Physics Faculty of Science University of Cape Town |
| spellingShingle | Physics Padayachee, Jayanethie The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| thesis_degree_str | Master's |
| title | The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| title_full | The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| title_fullStr | The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| title_full_unstemmed | The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| title_short | The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques |
| title_sort | application of bayesian statistics and maximum entropy to ion beam analysis techniques |
| topic | Physics |
| url | http://hdl.handle.net/11427/16143 |
| work_keys_str_mv | AT padayacheejayanethie theapplicationofbayesianstatisticsandmaximumentropytoionbeamanalysistechniques AT padayacheejayanethie applicationofbayesianstatisticsandmaximumentropytoionbeamanalysistechniques |