Abstract
The amounts of excess fissiogenic xenon (Xe136f) and excess radiogenic xenon (Xe129r) in the chondrites Beardsley and Holbrook have been measured to be Xe136f = 0.7 ± 0.3 and 0.7 ± 0.3, Xe129r = 2.0 ± 0.8, and 13.2 ± 2.9, respectively, in the unit of 10−12 cc STP/g. If Xe136f and Xe129r are the decay products of extinct radionuclides Pu244 and 1129, respectively, produced in the galactic nucleosynthesis process, the Pu/Xe and I/Xe decay intervals for both these chondrites can be shown to be concordant at approximately 200 m.y.
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