Studies of alpha-radioactivity in the marine environment

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dc.contributor.advisorCherry, R Den_ZA
dc.contributor.authorShannon, L Ven_ZA
dc.date.accessioned2016-03-21T19:26:52Z
dc.date.available2016-03-21T19:26:52Z
dc.date.issued1970en_ZA
dc.description.abstractThis dissertation deals with the alpha-radioactivity in the marine environment around South Africa, and the published literature relating to alpha-emitting nuclides in sea water and in marine organisms is surveyed in Chapter 1. As a first step in the investigation, the total alpha-activity of some 400 samples of marine life was determined using the thick-source alpha-particle detection technique. The relative contributions of the thorium series nuclides and "excess" unsupported polonium-210 were determined by using the "thorium pairs" technique and by studying the variation of the total alpha count-rate with time. This is considered in Chapter 2. The 'second phase of the investigation was to investigate the alpha-spectrum of marine life. This was done for several plankton samples using a large capacity ion-chamber. As expected several disequilibria were found to exist and the findings are discussed in Chapter 3. Unsupported polonium-210 accounted for the major proportion of the total alpha-activity in several marine groups, while radium-226 and daughters accounted for most of the long-lived radioactivity. Thorium series elements were also present. Using the ion-chamber data together with total alpha-counting data, an estimate of the radium-226 content of plankton was made.en_ZA
dc.identifier.apacitationShannon, L. V. (1970). <i>Studies of alpha-radioactivity in the marine environment</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/18132en_ZA
dc.identifier.chicagocitationShannon, L V. <i>"Studies of alpha-radioactivity in the marine environment."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1970. http://hdl.handle.net/11427/18132en_ZA
dc.identifier.citationShannon, L. 1970. Studies of alpha-radioactivity in the marine environment. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Shannon, L V AB - This dissertation deals with the alpha-radioactivity in the marine environment around South Africa, and the published literature relating to alpha-emitting nuclides in sea water and in marine organisms is surveyed in Chapter 1. As a first step in the investigation, the total alpha-activity of some 400 samples of marine life was determined using the thick-source alpha-particle detection technique. The relative contributions of the thorium series nuclides and "excess" unsupported polonium-210 were determined by using the "thorium pairs" technique and by studying the variation of the total alpha count-rate with time. This is considered in Chapter 2. The 'second phase of the investigation was to investigate the alpha-spectrum of marine life. This was done for several plankton samples using a large capacity ion-chamber. As expected several disequilibria were found to exist and the findings are discussed in Chapter 3. Unsupported polonium-210 accounted for the major proportion of the total alpha-activity in several marine groups, while radium-226 and daughters accounted for most of the long-lived radioactivity. Thorium series elements were also present. Using the ion-chamber data together with total alpha-counting data, an estimate of the radium-226 content of plankton was made. DA - 1970 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1970 T1 - Studies of alpha-radioactivity in the marine environment TI - Studies of alpha-radioactivity in the marine environment UR - http://hdl.handle.net/11427/18132 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18132
dc.identifier.vancouvercitationShannon LV. Studies of alpha-radioactivity in the marine environment. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1970 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18132en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.titleStudies of alpha-radioactivity in the marine environmenten_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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