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On the Effects of Resolution on APXS-GUAPX Analytical Results: From Spectrum to Peak Areas to Concentration Estimates

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Title: On the Effects of Resolution on APXS-GUAPX Analytical Results: From Spectrum to Peak Areas to Concentration Estimates
Author: Pardo, Renato
Department: Department of Physics
Program: Physics
Advisor: Campbell, John (Iain) LGellert, Ralf
Abstract: The thesis presents an in-depth investigation into the effects of spectral resolution on Alpha Particle X-ray Spectrometer (APXS) measurements processed using the GUAPX fitting code. The APXS analytical results contribute to understanding rock and soil types on Mars and the processes by which they formed. However, mission constraints, including instrumental degradation due to neutron damage and limited temperature control, mean that instrumental resolution cannot always be optimized. A methodology was developed using ratios of relevant analytical results to characterize the relationship between estimated peak areas, concentration estimates, and resolution. A differential effect favouring the heavier element concentration estimates with worsening resolution was observed and the underlying causes identified. The link between relative change in FWHM and concentration estimates was quantified for ten geochemical elements. Lastly, it was found that variations in estimated concentrations can fall outside precision error over resolution and concentration ranges similar to those seen on Mars.
URI: http://hdl.handle.net/10214/9150
Date: 2015-07
Rights: Attribution-NonCommercial-ShareAlike 2.5 Canada


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Attribution-NonCommercial-ShareAlike 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 2.5 Canada