Abstract
Evidence for the decay of extinct Pu 244 and I 129 has been found in the Kapoeta howardite. Accurate estimates of the amount of Xe 136 (10.6 ± 1.3 × 10 −12 cm 3/ g) from Pu 244 fission decay and of the Xe 129 (4.1 ± 0.6 × 10 −12 cm 3/ g) from I 129 beta decay are presented. The fission xenon yield in Kapoeta is Xe 131: Xe 132: Xe 134: Xe 136 = 26 ± 3:88 ± 4:91 ± 5: 100, in agreement with yields previously reported by other workers on other meteorites.
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