Depth profile of 53Mn in the lunar surface

Details Depth profile of 53Mn in the lunar surface Depth profile of 53Mn in the lunar surface

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..107i&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 1, p. 107-112.

Physics

11

Scientific paper

Measurements of cosmic-ray produced 53Mn are reported for a series of lunar surface samples down to a depth of 416 g/cm2. These results clearly illustrate the decrease in activity with depth as the incident galactic cosmic rays are absorbed. Below 60 g/cm2 the production rate decreases exponentially with a mean length, λ, of about 220 g/cm2. These results indicate that, at the Apollo 15 site, the lunar regolith has been unmixed, on a meter scale, for the last 5 my. The neutron activation technique for 53Mn, which allowed samples smaller than 200 mg to be used for these measurements, is described. Present address: University of Bern, Bern, Switzerland.

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