Other
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979m%26p....20..423p&link_type=abstract
Moon and the Planets, vol. 20, June 1979, p. 423-438.
Other
2
Core Sampling, Lunar Soil, Lunik Lunar Probes, Neon Isotopes, Tables (Data), Xenon Isotopes, Argon, Graphs (Charts), Helium, Mass Spectroscopy, Rare Gases
Scientific paper
The elemental and isotopic composition of noble gases in six samples from different depths of the Luna-24 drill core soil column, obtained by mass spectrometric analyses, are presented and the results are compared with those obtained by others for additional samples from the same drill core. The elemental ratios of N2-22/Xe-132, seem to indicate a low degree of maturity for the majority of the samples in this soil column. A detailed study of the cosmogenic isotopes, particularly Ne-21, in samples from different depths suggests that the entire soil column could be divided into two zones. Most of the samples in the upper zone fit to a regolith deposition model where about a meter of material got rapidly deposited and was irradiated as a single slab for a period of about (500 + or - 100)m.y. The samples from the lower zone, however, show cosmogenic Ne-21 contribution due to predepositional irradiation.
Padia J. T.
Rao Mallikharjuna N.
Venkatesan Ramarathnam
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