On deciphering the particle track record of lunar regolith history

Details On deciphering the particle track record of lunar regolith history On deciphering the particle track record of lunar regolith history

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..357c&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 10, 1977, p. 357-367. Research supported by the Centre National de la Recherche

Physics

3

Lunar Evolution, Lunar Soil, Lunar Surface, Particle Tracks, Computerized Simulation, Mathematical Models, Monte Carlo Method, Radiation Dosage, Space Environment Simulation

Scientific paper

The primary particle track density and track density gradient were studied on 100-micron soil grains of the lunar regolith in order to extract information on soil history near the surface. Nearly all such grains exhibit significant track density gradient (greater than 10%). A grain will receive such a gradient if and only if it is exposed within about 1 mm of the surface. For grains from several soil samples, two basic populations are discerned: Population 1 consists of young tracks with low track density and a track density gradient distribution consistent with a relatively short exposure and simple orientation history in the top soil layer; Population 2 consists of tracks with high density and gradients consistent with longer or repeated reoriented exposures within 1 mm of the surface. A Monte Carlo model was designed to simulate the near-surface history of 100-micron grains during surface exposure episodes (SEEs) lasting 1 m.y. each within 0.5 cm of the surface. The burial rate L and the number of SEEs characterize a soil sample.

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