Computer Science
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974lssf.nasa..358v&link_type=abstract
"In its Lunar Soil from the Sea of Fertility (NASA-TT-F-15881) p 358-369 (SEE N75-11814 02-91) Transl. into ENGLISH from the bo
Computer Science
Aluminum Isotopes, Cosmic Rays, Lunar Soil, Sodium Isotopes, Chemical Composition, Cosmic Ray Showers, Lunar Maria, Lunar Rocks, Lunar Surface, Lunik 16 Lunar Probe
Scientific paper
The activities of cosmogenic isotopes Al-26 and Na-22 in two samples taken from different depths of the lunar regolith core returned by the Luna 16 automatic station were measured by scintillation gamma spectrometer. The measured activities, when recalculated to the time of sampling of the lunar surface material, are: Al-26 - 62 + or - 8 and 54 + or - 9; Na-22 - 42 + or - 8 and 48 + or - 9. Depthwise distributions of the activities of these isotopes in lunar rocks of different types indicate the presence of a considerable depth gradient of activity near the surface caused by the fall off in the fluxes of primary and secondary cosmic radiation. The absence of this gradient in the measured samples, along with data on the tracks and content of inert gases, as well as the granulometric characteristics of the regolith indicate that the surficial layer of the regolith at the sampling site underwent mixing.
Gorin V. D.
Lavrukhina A. K.
Ustinova G. K.
Vinogradov A. P.
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