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Regolith history from cosmic-ray-produced isotopesA statistical model is given for soil development relating meteoroid impacts on the moon to cosmic-ray-produced isotopes in the soil. By means of this model, the average lunar mass loss rate during the past 1.4 aeons is determined to be 170g/sq cm aeon and the soil mixing rate to be approximately 200 cm/aeon from the gadolinium isotope data for the Apollo 15 and 16 drill stems. The isotope data also restrict the time variation of the meteoroid flux during the past 1.4 aeons.
Document ID
19740018164
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Fireman, E. L. (Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Date Acquired
September 3, 2013
Publication Date
April 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-134261
SAO-404-069
Accession Number
74N26277
Funding Number(s)
CONTRACT_GRANT: NGR-09-015-145
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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