Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer

J. L. Campbell; G. M. Perrett; J. A. Maxwell; E. Nield; R. Gellert; P. L. King; M. Lee; J. M. O'Meara; I. Pradler

doi:10.1016/j.nimb.2013.03.006

Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer

J. L. Campbell^*, G. M. Perrett, J. A. Maxwell, E. Nield, R. Gellert, P. L. King, M. Lee, J. M. O'Meara, I. Pradler

^*Corresponding author for this work

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Abstract

Spectra from the Mars rover alpha particle X-ray spectrometers contain the elastic and inelastic scatter peaks of the plutonium L X-rays emitted by the instrument's ²⁴⁴Cm source. Various spectrum fitting approaches are tested using the terrestrial twin of the APXS instrument on the Mars Science Laboratory Curiosity rover, in order to provide accurate extraction of the Lα and Lβ Compton/Rayleigh intensity ratios, which can provide information about light "invisible" constituents such as water in geological samples. A well-defined dependence of C/R ratios upon mean sample atomic number is established using a large and varied set of geochemical reference materials, and the accuracy of this calibration is examined. Detailed attention is paid to the influence of the rubidium and strontium peaks which overlap the Lα scatter peaks. Our Monte Carlo simulation code for prediction of C/R ratios from element concentrations is updated. The ratio between measured and simulated C/R ratios provides a second means of calibration.

Original language	English
Pages (from-to)	24-31
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	302
DOIs	https://doi.org/10.1016/j.nimb.2013.03.006
Publication status	Published - 2013

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Campbell, J. L., Perrett, G. M., Maxwell, J. A., Nield, E., Gellert, R., King, P. L., Lee, M., O'Meara, J. M., & Pradler, I. (2013). Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 302, 24-31. https://doi.org/10.1016/j.nimb.2013.03.006

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title = "Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer",

abstract = "Spectra from the Mars rover alpha particle X-ray spectrometers contain the elastic and inelastic scatter peaks of the plutonium L X-rays emitted by the instrument's 244Cm source. Various spectrum fitting approaches are tested using the terrestrial twin of the APXS instrument on the Mars Science Laboratory Curiosity rover, in order to provide accurate extraction of the Lα and Lβ Compton/Rayleigh intensity ratios, which can provide information about light {"}invisible{"} constituents such as water in geological samples. A well-defined dependence of C/R ratios upon mean sample atomic number is established using a large and varied set of geochemical reference materials, and the accuracy of this calibration is examined. Detailed attention is paid to the influence of the rubidium and strontium peaks which overlap the Lα scatter peaks. Our Monte Carlo simulation code for prediction of C/R ratios from element concentrations is updated. The ratio between measured and simulated C/R ratios provides a second means of calibration.",

keywords = "Alpha particle X-ray spectrometer, Calibration, Geochemical reference materials, Particle-induced X-ray emission analysis, X-ray fluorescence analysis",

author = "Campbell, {J. L.} and Perrett, {G. M.} and Maxwell, {J. A.} and E. Nield and R. Gellert and King, {P. L.} and M. Lee and O'Meara, {J. M.} and I. Pradler",

year = "2013",

doi = "10.1016/j.nimb.2013.03.006",

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Campbell, JL, Perrett, GM, Maxwell, JA, Nield, E, Gellert, R, King, PL, Lee, M, O'Meara, JM & Pradler, I 2013, 'Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 302, pp. 24-31. https://doi.org/10.1016/j.nimb.2013.03.006

Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer. / Campbell, J. L.; Perrett, G. M.; Maxwell, J. A. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 302, 2013, p. 24-31.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer

AU - Campbell, J. L.

AU - Perrett, G. M.

AU - Maxwell, J. A.

AU - Nield, E.

AU - Gellert, R.

AU - King, P. L.

AU - Lee, M.

AU - O'Meara, J. M.

AU - Pradler, I.

PY - 2013

Y1 - 2013

N2 - Spectra from the Mars rover alpha particle X-ray spectrometers contain the elastic and inelastic scatter peaks of the plutonium L X-rays emitted by the instrument's 244Cm source. Various spectrum fitting approaches are tested using the terrestrial twin of the APXS instrument on the Mars Science Laboratory Curiosity rover, in order to provide accurate extraction of the Lα and Lβ Compton/Rayleigh intensity ratios, which can provide information about light "invisible" constituents such as water in geological samples. A well-defined dependence of C/R ratios upon mean sample atomic number is established using a large and varied set of geochemical reference materials, and the accuracy of this calibration is examined. Detailed attention is paid to the influence of the rubidium and strontium peaks which overlap the Lα scatter peaks. Our Monte Carlo simulation code for prediction of C/R ratios from element concentrations is updated. The ratio between measured and simulated C/R ratios provides a second means of calibration.

AB - Spectra from the Mars rover alpha particle X-ray spectrometers contain the elastic and inelastic scatter peaks of the plutonium L X-rays emitted by the instrument's 244Cm source. Various spectrum fitting approaches are tested using the terrestrial twin of the APXS instrument on the Mars Science Laboratory Curiosity rover, in order to provide accurate extraction of the Lα and Lβ Compton/Rayleigh intensity ratios, which can provide information about light "invisible" constituents such as water in geological samples. A well-defined dependence of C/R ratios upon mean sample atomic number is established using a large and varied set of geochemical reference materials, and the accuracy of this calibration is examined. Detailed attention is paid to the influence of the rubidium and strontium peaks which overlap the Lα scatter peaks. Our Monte Carlo simulation code for prediction of C/R ratios from element concentrations is updated. The ratio between measured and simulated C/R ratios provides a second means of calibration.

KW - Alpha particle X-ray spectrometer

KW - Calibration

KW - Geochemical reference materials

KW - Particle-induced X-ray emission analysis

KW - X-ray fluorescence analysis

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DO - 10.1016/j.nimb.2013.03.006

M3 - Article

SN - 0168-583X

VL - 302

SP - 24

EP - 31

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

ER -

Refinement of the Compton-Rayleigh scatter ratio method for use on the Mars Science Laboratory alpha particle X-ray spectrometer

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