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Solar wind rare gas analysis: Trapped solar wind helium and neon in Surveyor 3 materialThe He-4 and Ne-20 contents in sections of the Surveyor 3 support strut samples were determined by optical and scanning electron microscopy and are compared to the results of the Apollo solar wind composition (SWC) experiments. The He-4/Ne-20 ratio in the samples from the sunlit side of the strut was approximately 300; the ratios determined in Apollo 12 lunar fines and SWC foil were below 100. The He-4/He-3 ratios were also determined, and the ratio obtained from Surveyor 3 material is higher than those found with Apollo 11 and 12 SWC experiments. The effects of spallation by cosmic rays or solar protons, stripping by cosmic ray or energetic solar alpha particles, recycling of solar wind He and radiogenic Ne, He from terrestrial atmosphere, mass discrimination near the moon, mass dependence of trapping probability, diffusion, and contamination by lunar dust are considered.
Document ID
19720019110
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Buehler, F.
(Bern Univ. Bern, Switzerland)
Eberhardt, P.
(Bern Univ. Bern, Switzerland)
Geiss, J.
(Bern Univ. Bern, Switzerland)
Schwarzmueller, J.
(Bern Univ. Bern, Switzerland)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12
Subject Category
Space Radiation
Accession Number
72N26760
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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