Cosmic ray exposure histories of Apollo 14, Apollo 15, and Apollo 16 rocks

Details Cosmic ray exposure histories of Apollo 14, Apollo 15, and Apollo 16 rocks Cosmic ray exposure histories of Apollo 14, Apollo 15, and Apollo 16 rocks

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..498e&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

1

Cosmic Rays, Lunar Rocks, Petrology, Radiation Effects, Rare Gases, Apollo Flights, Helium Isotopes, Krypton Isotopes, Radioactive Isotopes, Tables (Data), Xenon Isotopes, Moon, Samples, Lunar, Apollo 14, Apollo 15, Apollo 16, Rocks, History, Cosmic Rays, Exposure Ages, Rare Gases, Abundance, Krypton, Irradiation, 14053, 14303, 65315, Cone Crater, Ejecta, Anorthosite, South Ray, Origin, Source, Comparisons, Cosmogenic Elements, 14310, Fission, Xenon, 15058, 15415, Radionuclides, Depth, Production Rates, Bas

Scientific paper

The regolith exposure history of six rocks returned by the Apollo 14, 15, and 16 missions is studied based on the cosmogenic noble gas isotopes. For each sample, the complete set of all stable noble gas isotopes and the radiaoctive isotope Kr-81 were measured. Kr-81-Kr exposure ages are calculated for rocks for which a single-stage exposure can be demonstrated. A two-stage model exposure history is derived for multistage-exposure basalt 14310 based on the amounts and isotopic ratios of the cosmogenic noble gases. The apparent Kr-81-Kr age, the depth-sensitive isostopic ratios, and fission Xe-136 results lead to the conclusion that this sample was preexposed 1.75 AE ago to cosmic rays for a duration of 350 m.y. Basalt 15058 and anorthosite 15415 also reveal multistage exposures.

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