Uranium distribution in stone meteorites by the fission track technique

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Scientific paper

Uranium distributions in a group of stone meteorites have been examined in situ on a microscale by the technique of fission track activation, using a thin plastic overlay to detect the tracks. Changes in uranium concentration by factors of 10 5 are observed over distances of ~10 -2 cm. The non-uniformity in uranium content is such that in some samples regions of average uranium content are seldom found, making the usefulness of the term "average" doubtful. The ordinary chondrites of greater major element disequilibrium are found to have increased non-uniformity in uranium content from one chondrule to another and higher values of uranium in the chondrules relative to the matrix material.

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