Physics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nasa.reptw.....&link_type=abstract
Technical Report, NASA/CR-1997-207726; NAS 1.26:207726
Physics
Radioactive Isotopes, Nuclides, Meteorites, Beryllium Isotopes, Accuracy, Lunar Geology, Lunar Soil, Galactic Cosmic Rays, Mass Spectroscopy, Time Measurement, Surface Properties, Solar Cosmic Rays
Scientific paper
The measurement of radioactive nuclides is one of the primary methods for dating extraterrestrial and terrestrial materials and processes. We have developed techniques to measure cosmogenic nuclides with half-lives in the range from the 1 x 105 year Ca-41 to the 1.57 x 107 year I-129. Our goal is to use these measurements to help us understand the fundamental processes affecting the evolutionary history of extraterrestrial materials, such as lunar and meteoritic samples, including lunar meteorites and Martian meteorites. In addition to the histories of meteorites and lunar surface materials themselves we study the past activities of the Sun (solar cosmic rays, SCR) and galactic cosmic rays. We also use these cosmogenic nuclides to study cosmic spherules (micrometeorites), polar ice, and terrestrial surface rocks. The advent of Accelerator Mass Spectrometry (AMS) dramatically increased the measurement sensitivity and accuracy of long lived nuclides. The detection limits are a few times 105 atoms for Be-10 , Al-26, and Cl-16 with ratios of 10-14 - 10-15 to stable isotopes.
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