Low pressure radon diffusion - A laboratory study and its implications for lunar venting

Details Low pressure radon diffusion - A laboratory study and its implications for lunar venting Low pressure radon diffusion - A laboratory study and its implications for lunar venting

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..375f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Apr. 1976, p. 375-380. Research supported by the Robert A. Welch Foundation;

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3

Adsorption, Low Pressure, Lunar Soil, Particle Diffusion, Radon, Lunar Rocks, Migration, Random Walk, Sediments

Scientific paper

Results of a study of radon migration through columns of fine particulate materials, at total pressures of 0.02-0.2 torr, are reported. Materials studied were: NBS Glass Spheres (SRM 1003), Emerson & Cuming Eccospheres (IG-101), activated coconut charcoal, Lipaci obsidian, and W-1 Standard Diabase. Rates of diffusion were used to derive heats of adsorption for radon on the materials tested. The most reliable values found clustered around 8-9 kcal/mole. These high heats of adsorption, if typical for most materials, combined with low percentages of radon emanation by lunar soils found by other researchers, imply that random walk diffusion will not be an important mechanism for redistributing the radon and the radon daughters produced in the lunar regolith. In particular, since random walk migration is not a sufficient mechanism to account for localized high concentrations of radon-222 and its daughter polonium-210 observed by the Apollo 15 and 16 command modules, an alternative mechanism is proposed, in which radon would be swept to the surface by other gases during intermittent venting events.

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