Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..45..155m&link_type=abstract
Earth and Planetary Science Letters, vol. 45, no. 1, Oct. 1979, p. 155-171.
Astronomy and Astrophysics
Astronomy
12
Geochemistry, Lunar Composition, Lunar Soil, Lunar Surface, Titanium, Apollo 15 Flight, Apollo 16 Flight, Energy Bands, Energy Spectra, Gamma Ray Astronomy, Highlands, Lunar Maria, Regolith, Regression Analysis, Spectral Reflectance, Moon, Titanium, Concentrations, Apollo Missions, Highlands, Soils, Gamma Ray Experiment, Landing Sites, Maria, Basalts, Aristarchus Plateau, Chemistry, Telescopic Observations, Data, Surface, Lunar, Composition, Evolution, Samples, Spectrum, Alpha Backscattering Experiment, Com
Scientific paper
Titanium concentrations derived from the lunar-orbiting gamma-ray experiment on Apollo 15 and 16 by analyzing a spectral interval in which the titanium signal is relatively enhanced are presented. Landing site soil values provide the reference for a regression curve from which Ti concentrations in 137 regions of adequate counting statistics are calculated. Mare Tranquillitatis contains the highest, and Mare Crisium the lowest Ti concentration, and regional values in the western maria range from 1.1% to 4.1%. Highland Ti concentrations suggest a north-south symmetry which is not consistent with previously reported Fe and Th results. Comparisons with telescopic spectral reflectance studies of the maria do not show complete agreement and suggest that effects due to Fe may not have been fully removed from the reflectance data.
Metzger Albert E.
Parker R. E.
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