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dc.contributor.authorAli, Yusuf
dc.date.accessioned2022-08-22T09:12:22Z
dc.date.available2022-08-22T09:12:22Z
dc.date.issued2022-08-22
dc.identifier.urihttps://hdl.handle.net/2077/73421
dc.description.abstractBackground: Nuclear Power Plants (NPPs) release small amounts of radionuclides which contribute with a low radiation dose to the environment as well as humans and animals. In this context, marine ecosystems are critical, since most NPPs in Sweden are located by the sea. The Concentration Factor (CF) is a model parame ter that is used to study the transport and uptake of these radionuclides. However, the published CF values for many elements range across several orders of magnitude. Aims: The aim of this project was to experimentally determine phytoplankton CF for some of the radionuclides released from various nuclear facilities in Sweden, in order to improve their uncertainties and to enable a more realistic dose assessment. The elements analyzed in this study were nickel, ruthenium and antimony. Materials and Methods: Seawater samples from two separate stations (Anholt E and Karlsödjupet) near NPP in Sweden, were collected by SMHI. Phytoplankton were then cultured in these seawater samples with addition of relevant radionuclides and nutrients. The cultures were filtered when the phytoplankton concentration reached around 1·106 cells/mL. A HPGe-detector was used to measure the activity of the filtrates and filters from 106Ru and 125Sb. Likewise, a liquid scintillation counter (LSC) was used to measure the activity of the samples containing 63Ni. Results and Discussion: The mean calculated phytoplankton dry weight were 33 ± 8 and 26 ± 4 pg for Anholt E and Karlsödjupet, respectively. The phytoplankton growth rates and dry weights in the different seawater samples were not significantly different. The mean calculated phytoplankton CF for the respective elements were as follows: 4000 and 3800 L/kg for Ni; 15000 and 20000 L/kg for Ru and 250 and 700 L/kg for Sb. The obtained values are in good agreement with published data. Conclusion: The phytoplankton CF for the elements studied were as follows: 4000 and 3800 L/kg for Ni; 15000 and 20000 L/kg for Ru and 250 and 700 L/kg for Sb. The CF obtained in this study, had a smaller variation compared to the literature data, thus the uncertainties in the CF have been improved considerably. These CF will therefore provide a more realistic dose assessment. Keywords: concentration factor (CF), phytoplankton, phaeodactylum tricornutum, uptake, radioactive releases, nickel, ruthenium, antimony, gamma spectroscopy, liquid scintillation counting.en_US
dc.language.isoengen_US
dc.subjectMedical physicsen_US
dc.subjectEnvironmental radiologyen_US
dc.subjectNuclear Power Plantsen_US
dc.subjectconcentration factor (CF)en_US
dc.subjectphytoplanktonen_US
dc.subjectphaeodactylum tricornutumen_US
dc.subjectradioactive releasesen_US
dc.subjectnickelen_US
dc.subjectrutheniumen_US
dc.subjectantimonyen_US
dc.subjectgamma spectroscopyen_US
dc.subjectliquid scintillation countingen_US
dc.titleAccumulation of 63Ni, 106Ru and 125Sb in phytoplanktonen_US
dc.title.alternativeAccumulation of 63Ni, 106Ru and 125Sb in phytoplanktonen_US
dc.typeText
dc.setspec.uppsokMedicine
dc.type.uppsokH2
dc.contributor.departmentUniversity of Gothenburg/Institute of Clinical Sciences
dc.contributor.departmentGöteborgs universitet/Institutionen för kliniska vetenskaper
dc.type.degreeStudent essay


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