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Angelo J. Castro
Researcher at Martin Marietta Materials, Inc.
Publications - 3
Citations - 367
Angelo J. Castro is an academic researcher from Martin Marietta Materials, Inc.. The author has contributed to research in topics: Mars Exploration Program & Chryse Planitia. The author has an hindex of 2, co-authored 3 publications receiving 360 citations. Previous affiliations of Angelo J. Castro include United States Geological Survey.
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Journal ArticleDOI
Inorganic analyses of martian surface samples at the viking landing sites.
Benton C. Clark,A. K. Baird,Harry J. Rose,Priestley Toulmin,Klaus Keil,Angelo J. Castro,Warren C. Kelliher,Catherine D. Rowe,Peter H. Evans +8 more
TL;DR: Elemental analyses of fines in the Martian regolith at two widely separated landing sites, Chryse Planitia and Utopia Planitia, produced remarkably similar results.
Journal ArticleDOI
The Viking X ray fluorescence experiment - Analytical methods and early results
Benton C. Clark,A. K. Baird,Harry J. Rose,Priestley Toulmin,R. P. Christian,Warren C. Kelliher,Angelo J. Castro,Catherine D. Rowe,Klaus Keil,Gary R. Huss +9 more
TL;DR: In this paper, the X ray fluorescence spectrometers of the Viking lander were used to determine absolute elemental concentrations of the Martian regolith, which required gain drift adjustments, subtraction of background components and use of a mathematical response model with adjustable parameters set by prelaunch measurements on selected rock standards.
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An X-Ray Proportional Counter for the Viking Lander
TL;DR: A set of four sealed proportional counters with optimized energy response was employed in the X-ray fluorescence spectrometer units aboard the two Viking Landers as discussed by the authors, which provided quantitative elemental analyses of soil samples taken from the Martian surface.