Studies of lunar regolith dynamics using measurements of cosmogenic radionuclides in lunar rocks, soils and coresThe present investigation is concerned with two types of measurements. The first deals with the use of Al-26 to define regolith gardening processes which have occurred in the upper portion of the lunar cores that were collected both by the deep drilling and drive tube operations. The second portion of the study involves the use of Mn-53 and Al-26 concentrations to determine the surface exposure histories of individual rocks over the past ten million years. It is found that during the past two million years, 15011 has had a history of simple gardening with an accumulation rate of 2 cm/m.y. The Apollo 15 Station 2 boulder appears to have been in place for about five million years. The 'shadowed' soil (75237) shows a shielding effect of about 40%. The Apollo 16 Station 9 boulder appears to have been in place for about four million years and thus is apparently not related to the South Ray Crater event.
Document ID
19820048175
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Fruchter, J. S. (Battelle Pacific Northwest Labs. Richland, WA, United States)
Reeves, J. H. (Battelle Pacific Northwest Labs. Richland, WA, United States)
Evans, J. C. (Battelle Pacific Northwest Labs. Richland, WA, United States)
Perkins, R. W. (Battelle Pacific Northwest Laboratories Richland, WA, United States)