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Browsing by Supervisor "Malherbe, Johan B."
Now showing items 1-20 of 28
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(University of Pretoria, 2012-11-12)The behaviour of iodine, before and after annealing, in pyrolytic carbon (PyC) has been studied using the Rutherford backscattering spectrometry (RBS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). PyC ...
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(University of Pretoria, 2015)Electron cyclotron resonance ion sources and electron string ion sources play an important role in the production of multi-charged ion beams. We have used these devices to irradiate highly oriented pyrolytic graphite with ...
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(University of Pretoria, 2017)Generation IV high temperature nuclear reactors use TRISO (tristructural isotropic) particles for containment of radioactive fission products. In these particles silicon carbide (SiC) is the main barrier for containing ...
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(University of Pretoria, 2022)The South African Naturally Occurring Radioactive Material (NORM) regulatory framework provides guidance on most matters associated with radiation protection within the mining and minerals processing sphere, but definitive ...
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(University of Pretoria, 2015)Metrology is the science of measurement. It involves the formulation of the theoretical principles related to the definition of the International System of Units (Système International d Unités, SI) and the development ...
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(University of Pretoria, 2015)The diffusion and surface effects of several fission product elements implanted in SiC have been investigated. SiC is used as the main barrier for fission products in modern high temperature gas cooled reactors. An ...
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(University of Pretoria, 2019)In my PhD study glassy carbon samples were implanted with 250 keV europium ions at room temperature and at 100 oC. The main purpose of my study was to study the diffusion properties of the europium in the glassy carbon. After ...
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(University of Pretoria, 2011-07-04)The diffusion of iodine implanted 6H-SiC has been investigated using Rutherford backscattering Spectrometry (RBS). SiC is used as the main barrier in the modern high temperature gas cooled reactors. An understanding of the ...
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(University of Pretoria, 2010-07-27)SiC is used as the main diffusion barrier in the fuel spheres of the pebble bed modular reactor (PBMR). The PBMR is a modern high temperature nuclear reactor. However, the release of silver from the fuel spheres has raised ...
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(University of Pretoria, 2019)Glassy carbon also known as vitreous carbon has a number of special properties making it a very interesting material with many applications. It is a non-graphitizing carbon which combines glassy and ceramic properties with ...
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Effect of heat treatment on the migration behaviour of selenium implanted into polycrystalline SiC (University of Pretoria, 2021)The success of a very high temperature gas cooled reactors (VHTGRs) like a pebble bed modular reactor (PBMR) depends greatly on the retainment of fission products. In PBMR the retainment is achieved by coating the fuel ...
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(University of Pretoria, 2023)The storage and management of nuclear waste is perhaps the most controversial aspect of nuclear power production, as there is no permanent solution to this problem that has existed for centuries. In the last decade, our ...
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(University of Pretoria, 2021)The containment of fission products (FPs) in a nuclear fuel particle is the biggest concern regarding the safety of high temperature reactors (HRTs). In modern high temperature gas cooled nuclear reactors (HTGRs), safety ...
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(University of Pretoria, 2019-12-15)The effect of ion irradiation and annealing on the microstructure and migration behaviour of implanted Sr and Ag in SiC have been investigated. SiC is used as the main barrier for fission products in modern high temperature ...
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(University of Pretoria, 2016)Rangelands are extremely important for livestock grazing purposes in South Africa. Grazing should thus be regulated in order to conserve grass, shrubs and trees thereby ensuring sustainability of rangelands. In South Africa, ...
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(University of Pretoria, 2020-07-01)The demand for dry casks for extended storage of radioactive nuclear waste is driven by dearth of permanent repositories. Most of the dry cask storage system currently in use are made up of stainless steel which could ...
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(University of Pretoria, 2017)Silicon carbide (SiC) is used as the main diffusion barrier to prevent the fission products (FPs) from escaping in high temperature reactors (HTRs). It retains most of the FPs quite effectively with the exception of silver, ...
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(University of Pretoria, 2022)The demand for biomedical implants is on the rise for the maintenance and improvement of human health. These biomedical implants reinstate the function of living tissue and/or organs in the human body. Accidents, sports ...
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(University of Pretoria, 2017)The release of radioactive fission products during nuclear energy reactor operation imposes a serious danger to personnel’s health and the environment. In a modern Pebble Bed Modular Reactor (PBMR) TristructuralIsotropic ...
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(University of Pretoria, 2019)This study is in two parts. Both parts are geared towards the study of the effectiveness of glassy carbon as a good storage material was investigated. Firstly, 200 keV Xe ions were implanted into glassy carbon substrates ...
Now showing items 1-20 of 28