Alpha-Particle Activity of Apollo 11 Samples

Details Alpha-Particle Activity of Apollo 11 Samples Alpha-Particle Activity of Apollo 11 Samples

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..516r&link_type=abstract

Science, Volume 167, Issue 3918, pp. 516-517

Computer Science

Scientific paper

Nine polished thin sections have been exposed to nuclear track plates, three have been counted by alpha-particle spectrometry, and one has been examined by electron microprobe. Interpretation of the results is in a preliminary stage. Alpha track distribution in the autoradiograph of a breccia forms a network that appears related to the rims of accretionary lapilli composing the breccia. Thorium in a coarse-grained crystalline rock is concentrated in micron-sized, zirconium-rich crystals. Alpha count rates agree with what would be predicted from previously reported thorium and uranium contents of the same rocks, suggesting secular equilibrium for the thorium and uranium decay series.

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