Measurements of I-129 in meteorites and lunar rock by tandem accelerator mass spectrometry

Details Measurements of I-129 in meteorites and lunar rock by tandem accelerator mass spectrometry Measurements of I-129 in meteorites and lunar rock by tandem accelerator mass spectrometry

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..611n&link_type=abstract

Nature (ISSN 0028-0836), vol. 305, Oct. 13, 1983, p. 611, 612. Research supported by the California Institute of Technology.

Computer Science

11

Iodine Isotopes, Lunar Composition, Lunar Rocks, Mass Spectroscopy, Meteoritic Composition, Van De Graaff Accelerators, Cosmochemistry, Half Life, Meteorites, Samples, Meteorite, Moon, Lunar, Radioisotopes, Iodine, Abundance, Techniques, Mass Spectrometry, Comparisons, Data, Procedure, Abee, Allende, Dhajala, Apollo 14, 14310

Scientific paper

Precise measurements of the half-life of I-129 in three different meteorites and one lunar surface rock are reported. The meteorite source of I-129 was produced by cosmic ray secondary neutron reactions on Te, while the source in lunar materials in spallation on barium and rare earth elements. The Abee, Allende, and Dhajala meteorites were examined, together with the lunar rock 14310. Details of the process used to extract the iodine are provided. The Abee and Allende samples exhibited a production of 0.5 atom/min per gm of Te from the (n,2n) reaction and 0.05 atom/min/gm for the (n,gamma) reaction. The I-129 is concluded to be a viable tool for long-lived cosmogenic nuclide studies. Further work to extend the data to include the constancy of the cosmic ray flux, the meteorite bombardment history, and the cosmic exposure age dating by means of the I-129 and Xe-129 method is indicated.

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