Investigation of element distributions in Luna-16 regolith

Details Investigation of element distributions in Luna-16 regolith Investigation of element distributions in Luna-16 regolith

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981geokh......323k&link_type=abstract

Geokhimiia, Mar. 1981, p. 323-328. In Russian.

Computer Science

Lunar Composition, Lunik 16 Lunar Probe, Neutron Activation Analysis, Regolith, Chemical Elements, Chondrites, Lunar Rocks, Radioactive Isotopes, Rare Earth Elements, Size Distribution

Scientific paper

The concentrations of 32 elements in fractions of different grain sizes in the samples of the lunar regolith brought back by Luna-16 are determined by means of neutron activation analysis. Four groups of elements are distinguished on the basis of the variations of their concentration with grain size, and concentration variations of the various elements with sample depth are also noted. Chemical leaching of the samples combined with neutron activation also reveals differences in element concentrations in the water soluble, metallic, sulphide, phosphate, rare mineral and rock phases of the samples. In particular, the rare earth elements are observed to be depleted in the regolith with respect to chondritic values, and to be concentrated in the phase extracted with 14 M HNO3.

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