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Measuring Neutron Absorption Cross Sections of Natural Platinum via Neutron Activation Analysis

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dc.creator Petersen, Nicholas
dc.date.accessioned 2012-06-13T14:59:19Z
dc.date.available 2012-06-13T14:59:19Z
dc.date.issued 2012-06-11
dc.identifier.uri http://hdl.handle.net/1957/29836
dc.description.abstract This thesis presents a measurement of the resonance integral and thermal cross section – which together represent the total neutron absorption cross section – of the naturally occurring isotopes of platinum that emit gamma radiation upon neutron absorption. The measurements were made via neutron activation analysis. Platinum samples were bombarded by neutrons produced in Oregon State University’s TRIGA nuclear reactor. Afterwards, the decay of the excited samples was measured to determine the activity of each isotope, yielding measurements of the cross sections for each. This experiment was repeated multiple times in different reactor locations to improve accuracy. Previous measurements of these values have been flawed by poor photon detector resolution, and evolving branching ratios, half-lives, natural abundances. A search of the literature reveals poor agreement and large error estimations. The results from this thesis are consistent, with one exception: there appears to be a systematic disagreement between the resonance integral measurements of samples bombarded in two different reactor locations. This discrepancy has now been seen in several experiments, which indicates inconsistent epithermal flux throughout OSU’s reactor. en_US
dc.description.tableofcontents 1 INTRODUCTION 1 • 1.1 MOTIVATION 1 • 1.2 CROSS SECTION AND NEUTRON ENERGY 2 • 1.3 DECAY SCHEME AND NUCLEAR SPIN 5 • 1.4 PLATINUM ISOTOPES 6 2 EXPERIMENTAL METHODS 8 • 2.1 EXPERIMENT OVERVIEW 8 • 2.2 INDEPENDENT EXPERIMENTS 8 • 2.3 FLUX MONITORS 11 • 2.4 CAPTURE OF GAMMA SPECTRA 11 • 2.4 DATA ANALYSIS 12 • 2.5 DETECTOR EFFICIENCY 14 3 RESULTS 16 • 3.1 CLICIT RESULTS 16 • 3.2 CADMIUM-ENCLOSED RABBIT RESULTS 17 • 3.3 NON CADMIUM-ENCLOSED RABBIT RESULTS 19 • 3.4 THERMAL COLUMN RESULTS 20 • 3.5 UNCERTAINTY CALCULATIONS 21 4 DISCUSSION 22 • 4.1 PREVIOUS RESULTS 22 • 4.2 PT-190 → PT-191 CROSS SECTION 23 • 4.3 PT-194 → PT-195M CROSS SECTION 24 • 4.4 PT-196 → PT-197G CROSS SECTION 24 • 4.5 PT-196 → PT-197M CROSS SECTION 24 • 5.6 PT-198 → PT-199G CROSS SECTION 24 5 CONCLUSION 26 6 ACKNOWLEDGEMENTS 27 7 REFERENCES 28 en_US
dc.language.iso en_US en_US
dc.subject Cross section en_US
dc.subject Platinum en_US
dc.subject Neutron activation analysis en_US
dc.subject TRIGA en_US
dc.subject Resonance integral en_US
dc.title Measuring Neutron Absorption Cross Sections of Natural Platinum via Neutron Activation Analysis en_US
dc.type Thesis en_US
dc.description.digitization Copy digitally converted to pdf format using Adobe software. 445 kb. en_US


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