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The Solar Irradiation Record in Lunar Dust Grains

Published online by Cambridge University Press:  07 February 2017

J. Borg  and
B. Vassent
J. Borg
Affiliation:
Centre de Spectrométrie de Masse du C.N.R.S.-91 ORSAY-France
B. Vassent
Affiliation:
Centre de Spectrométrie de Masse du C.N.R.S.-91 ORSAY-France

Abstract

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Comparative studies of the distribution of latent and etched tracks in lunar grains from five different size fractions of three lunar fine samples and of six lunar dust samples taken at different depths in core tube 12028 have been performed by using transmission and scanning electron microscopies. Two very different sets of etching conditions were used: a slight etching was applied for transmission microscopy but a much stronger etching was used for scanning microscopy. We observed: (1) a definite stratigraphy in the core tube, both in the latent and etched track distributions; (2) striking differences between the densities of the latent and slightly etched tracks (≥ 1010 tracks cm−2) and those of the strongly etched tracks, ranging from ⋍ 108 to 5.109 tracks cm−2; (3) a lack of correlation between the grain size and the density of strongly etched tracks observed on the external surface of grains from sample 12032; (4) no variation of the density of the tracks with the depth inside a grain. Some implications of the present results concerning the ancient low energy solar cosmic rays and the fabric of the lunar soil will be briefly discussed.

Type
Part II: Scientific Papers
Information
Symposium - International Astronomical Union , Volume 47: The Moon , 1972 , pp. 298 - 308
Copyright
Copyright © Reidel 1972 

References

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