Abstract
Excess radiogenic129Xe, which should have been produced by the beta-decay of the extinct radionuclide129I, is conspicuously missing in the acid residues isolated from various carbonaceous chondrites, in which244Pu fission xenon is highly enriched. Results from recent studies indicate that either a) the last supernova exploded more than 150 to 200 million years prior to the time the carbonaceous chondrites began to retain their244Pu fission xenon or b) fine-grained interstellar diamond crystals in the carbonaceous chondrites played the role of a fission product catcher for a quantitative retention of244Pu fission xenon, while allowing excess129Xe from the weak beta-decay of129I to escape from the meteorites.
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Kuroda, P.K., Myers, W.A. Plutonium-244 dating. Journal of Radioanalytical and Nuclear Chemistry, Articles 173, 229–237 (1993). https://doi.org/10.1007/BF02043025
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DOI: https://doi.org/10.1007/BF02043025