NASA NTRS · 19950009786
Alpha proton x ray spectrometer
Abstract
Mars Pathfinder will carry an alpha-proton x ray spectrometer (APX) for the determination of the elemental chemical composition of Martian rocks and soils. The instrument will measure the concentration of all major and some minor elements, including C, N, and O at levels above typically 1 percent.
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Rieder, Rudi, Waeke, H., Economou, T.. 1994-01-01. Alpha proton x ray spectrometer. https://ntrs.nasa.gov/citations/19950009786
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