Radioactivity Induced in Apollo 11 Lunar Surface Material by Solar Flare Protons

On July 24, 1969, the first extraterrestrial samples, with the exception of meteorites, were returned to earth by Apollo 11. Since then these samples and the samples returned by Apollo 12 have been subjected to scientific investigations by hundreds of scientists from many countries. Drawing on advances from the last 25 years of study of meteorites and terrestrial rocks the variety and sophistication of the techniques used on these samples is truly impressive. It can truthfully be said that 10 years ago we could not have made the measurements, and that, even if we had had the data, we could not have interpreted it. The electron microprobe, the scanning electron microscope, and the mass spectrometer, as well as other instruments and techniques, have joined the microscope as routine tools with which to attack a petrologic problem.

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Radioactivity Induced in Apollo 11 Lunar Surface Material by Solar Flare Protons

Abstract: Comparison of values of the specific radioactivities reported for lunar surface material from the Apollo 11 mission with analogous data for stone meteorites suggests that energetic particles from the solar flare of 12 April 1969 may have produced most of the cobalt-56 observed.

Cited by 4 publications

References 11 publications

Hard rock cosmic ray archaeology

Hard rock cosmic ray archaeology

Bibliography section

Mineralogy, petrology, and geochemistry of the lunar samples

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