Depth profile of $sup 53$Mn in the lunar surface
Journal Article
·
· Earth Planet. Sci. Lett., v. 20, no. 1, pp. 107-112
Measurements of cosmic-ray produced /sup 53/Mn are reported for a series of lunar surface samples down to a depth of 416 g/cm/sup 2/. These results clearly illustrate the decrease in activity with depth as the incident galactic cosmic rays are absorbed. Below 60 g/cm/sup 2/ the production rate decreases exponentially with a mean length, lambda , of about 220 g/cm/sup 2/. 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 /sup 53/Mn which allowed samples smaller than 200 mg to be used for these measurements, is described. (auth)
- Research Organization:
- Univ. of California, San Diego
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-008562
- OSTI ID:
- 4426145
- Journal Information:
- Earth Planet. Sci. Lett., v. 20, no. 1, pp. 107-112, Journal Name: Earth Planet. Sci. Lett., v. 20, no. 1, pp. 107-112; ISSN EPSLA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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