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Emulating the Mars APXS with Accelerator-Based PIXE

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dc.contributor.advisor Campbell, John L. (Iain)
dc.contributor.advisor O'Meara, Joanne Flannigan, Erin Lynn 2017-05-04T15:17:50Z 2017-05-04T15:17:50Z 2017-05 2017-04-27 2017-05-04
dc.description.abstract A broad beam proton-induced X-ray emission (PIXE) system was designed in order to emulate and extend the calibration of Curiosity’s Alpha-Particle X-ray Spectrometer (APXS). For calibration of the PIXE system, twenty pure element standards were used to determine the instrumental constant over a range of X-ray energies. The issue of the choice between theoretical mass attenuation coefficient databases, XCOM and FFAST, was addressed. Deviations of light element (sodium, magnesium, aluminum) concentrations previously seen in the APXS were also seen in the accelerator-based PIXE measurements. These deviations arise from the rock structure’s violation of the assumption of sample homogeneity on the atomic scale. Systematically low iron concentrations, which appear unlikely to arise due to the homogeneity assumption, are more likely due to the grain size distribution of iron-bearing minerals in the powdered standards. Corrections for the deviations were determined and extended to Martian analog samples including basaltic trachyandesites, trachyandesites and trachytes. en_US
dc.description.sponsorship NSERC Discovery grant to Dr. J.L. Campbell and a CSA grant to Dr. R. Gellert en_US
dc.language.iso en en_US
dc.publisher University of Guelph en_US
dc.subject APXS en_US
dc.subject PIXE en_US
dc.subject X-ray en_US
dc.subject emission en_US
dc.subject detector en_US
dc.subject light element en_US
dc.subject FFAST en_US
dc.subject XCOM en_US
dc.subject mass attenuation coefficient en_US
dc.subject fundamental parameters en_US
dc.subject mineral phase effects en_US
dc.subject matrix heterogeneity en_US
dc.subject grain size en_US
dc.title Emulating the Mars APXS with Accelerator-Based PIXE en_US
dc.type Thesis en_US Physics en_US Master of Science en_US Department of Physics en_US
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated. University of Guelph en_US

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