High voltage electron microscope studies of fossil nuclear particle tracks in extraterrestrial matter

Physics

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Scientific paper

Fossil nuclear particle tracks in lunar and meteoritic materials have been searched for with the 1 MeV electron microscope of the Institut d'Optique Electronique du C.N.R.S., Toulouse, both before and after a chemical etching of the samples. Evidences for very high densities of non etchable tracks of two different kinds have been observed only in the finest fraction (<400 mesh) of the lunar soil from the Apollo 11 and 12 missions but not in the type 1 carbonaceous chondrite Orgueil, in the dark part of the solar type gas-rich Pesyanoe enstatite achondrite or in crystals extracted from lunar rock 10047. These track densities can exceed by a factor of 100, the densities of etched tracks measured in the same lunar soil samples. Some implications of the present results concerning lunar and meteoritic matter, the “ancient” fluxes of solar particles and solid state physics are briefly discussed.

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