Separation of detector non-linearity issues and multiple ionization satellites in alpha-particle PIXE
| Autor: | John L. Campbell, Brianna Ganly, John A. Maxwell, Christopher M. Heirwegh |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Range (particle radiation) 010504 meteorology & atmospheric sciences Spectrometer Detector Alpha particle Alpha particle X-ray spectrometer 01 natural sciences Spectral line Nuclear physics Ionization 0103 physical sciences Calibration 010303 astronomy & astrophysics Instrumentation 0105 earth and related environmental sciences |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 414:38-44 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2017.10.001 |
| Popis: | Multiple ionization satellites are prominent features in X-ray spectra induced by MeV energy alpha particles. It follows that the accuracy of PIXE analysis using alpha particles can be improved if these features are explicitly incorporated in the peak model description when fitting the spectra with GUPIX or other codes for least-squares fitting PIXE spectra and extracting element concentrations. A method for this incorporation is described and is tested using spectra recorded on Mars by the Curiosity rover’s alpha particle X-ray spectrometer. These spectra are induced by both PIXE and X-ray fluorescence, resulting in a spectral energy range from ∼1 to ∼25 keV. This range is valuable in determining the energy-channel calibration, which departs from linearity at low X-ray energies. It makes it possible to separate the effects of the satellites from an instrumental non-linearity component. The quality of least-squares spectrum fits is significantly improved, raising the level of confidence in analytical results from alpha-induced PIXE. |
| Databáze: | OpenAIRE |
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