Computer Science
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..568k&link_type=abstract
Nature (ISSN 0028-0836), vol. 319, Feb. 13, 1986, p. 568-570.
Computer Science
17
Calcium Isotopes, Iron Meteorites, Mass Spectroscopy, Meteoritic Composition, Particle Accelerators, Radioactive Age Determination, Energy Spectra, Gas Detectors
Scientific paper
The first use of tandem accelerator mass spectrometry (TAMS) to measure the content of Ca-41 in a natural sample, the iron Bogou meteorite, is reported. Ca in the samples was extracted by hydroxide precipitation and purified by means of a caution exchange resin (AG 50W-X8). After adding 4 percent ammonium oxide, the precipitate was ignited to CaO in a quartz vial at about 1100 C. The Ca-41/Ca ratios were determined following acceleration by alternate measurements of the Ca-40 beam current in an image Faraday cup. Ca-41 particles were also measured using a gas counter. The measured Ca-41/Ca ratio was 3.8 + or -0.6 x 10 to the 12th, which corresponds to a Ca-41 activity of 6.9 + or -1.1 d.p.m. per kg. Calculation of the half-life of Ca-41 in the Bogou meteorite yielded an age of 103,000 years.
Arnold James R.
Conard Nicholas J.
Elmore David
Kubik Peter W.
Nishiizumi Kuni
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