A re-examination of the fundamental parameters approach to calibration of the Curiosity rover alpha particle X-ray spectrometer
| Autor: | Scott VanBommel, D.W. Tesselaar, D.D. Thomson, N.G. Holmes, John L. Campbell, Erin L. Flannigan |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Nuclear and High Energy Physics Spectrometer Astrophysics::High Energy Astrophysical Phenomena 010401 analytical chemistry Monte Carlo method Mars Exploration Program Alpha particle Alpha particle X-ray spectrometer 01 natural sciences Spectral line 0104 chemical sciences Computational physics 0103 physical sciences Calibration 010303 astronomy & astrophysics Instrumentation Excitation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 447:22-29 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2019.03.036 |
| Popis: | In terrestrial instruments for X-ray emission analysis (e.g. X-ray fluorescence, electron microprobe) the angle of excitation and the angle of characteristic X-ray emission by samples are typically well-defined. This is not the case for the Mars rovers’ alpha particle X-ray spectrometers, necessitating use of “effective” angles in any fundamental parameters approach to spectrum fitting and derivation of element concentrations. A new Monte Carlo computation of expected characteristic X-ray yields has enabled us to examine the choice of effective angles in detail and to compare with our previous estimates; the mean angles taken over all detected events appear to be the most satisfactory approximation. These were used in our GUAPX code to process APXS spectra from ten mono-mineralic geochemical reference materials. Agreement between our concentration values and those determined by the specialist company ActLabs was excellent. |
| Databáze: | OpenAIRE |
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