Abstract
WHILE determining the radiogenic argon-40 content of the Beardsley chondritic meteorite1, a mass spectrometric search for xenon-129 produced by decay of iodine-129 was made. The total amount of xenon which was observed was 5 × 10−9 c.c. (s.t.p.) from a 29.86-gm. meteorite sample. Within the limits of experimental error, this xenon had a normal isotopic composition2. The ratio of xenon to argon-36 was in essential agreement with that found in air, indicating that this xenon was due to atmospheric contamination. Since a 30 per cent increase in the abundance of xenon-129 over that observed in normal xenon would have been observable, this indicates that radiogenic xenon-129 was present in this meteorite to less than 1.3 × 10−11 c.c. (s.t.p.)/gm. H. E. Suess and M. G. Inghram (personal communication) have suggested that if the meteorites had been formed soon after the formation of the elements, they would contain an excess of xenon-129 due to decay of iodine-129.
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WASSERBURG, G., HAYDEN, R. Time Interval between Nucleogenesis and the Formation of Meteorites. Nature 176, 130–131 (1955). https://doi.org/10.1038/176130b0
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DOI: https://doi.org/10.1038/176130b0
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