Results of measurements of cosmic-ray-produced Mn-53 taken down the length of the Apollo 16 deep drill core are presented. They indicate that the lunar regolith has been unmixed, on a meter scale, for the past 5 million years at the location of this core. The data are in agreement with earlier Mn-53 measurements on the Apollo 15 drill core. Mn-53 activity profiles in 14310, 12002, and 14321 are compared to each other; all three rocks have probably been on the lunar surface long enough to saturate their solar cosmic-ray-produced Mn-53 (half-life = 3.7 m.y.) activity.
Depth profiles of Mn-53 in lunar rocks and soils
Lunar Science Conference ; 1974 ; Houston, TX
1974-01-01
Miscellaneous
No indication
English
Cosmogenic-Nuclide Depth Profiles in Lunar Rocks
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