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The Particle Track Record of the Lunar Surface

Published online by Cambridge University Press:  07 February 2017

G. M. Comstock
G. M. Comstock*
Affiliation:
General Electric Research and Development Center, Schenectady, New York, U.S.A.

Abstract

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Information about lunar surface history revealed by fossil particle tracks is summarized. Such tracks are the result of damage left in dielectric materials by highly ionizing charged particles including heavy solar and galactic cosmic ray nuclei, heavy nuclei recoiling from cosmic ray induced spallation reactions and induced- and spontaneous-fission fragments. From the distribution of cosmic ray and spallation tracks in the lunar rock, surface residence times of 1 to 30 million yr and rock erosion rates of 1 to 10 Å/yr have been determined. Particle tracks also record surface orientation and depth history of the rocks and contain information about ancient solar activity. The distribution of particle tracks in lunar soil is found to be consistent with a model which includes repeated excavation, layering and burial. With this model one core 12025 + 28 soil layer can be identified as unmixed and weakly irradiated; the others contain soil which has been better and better mixed and more and more irradiated.

Type
Part II: Scientific Papers
Information
Symposium - International Astronomical Union , Volume 47: The Moon , 1972 , pp. 330 - 352
Copyright
Copyright © Reidel 1972 

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