Abstract
The radioisotope 129I (half life, t½=1.57×107 yr) offers the possibility of extending the time span over which cosmogenic radioisotopes can be used to study extraterrestrial and terrestrial phenomena. Its half life falls between that of 53Mn (3.7×106 yr) and 40K (1.28×109 yr) in a region where interesting effects can be expected. The target elements for z>28 are normally present in low concentration in natural materials, making detection difficult. We report here the first precise measurements of 129I in extraterrestrial materials: three meteorites of different classes and one lunar surface rock.
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Nishiizumi, K., Elmore, D., Honda, M. et al. Measurements of 129I in meteorites and lunar rock by tandem accelerator mass spectrometry. Nature 305, 611–612 (1983). https://doi.org/10.1038/305611a0
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DOI: https://doi.org/10.1038/305611a0
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