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- W2004840285 abstract "Two Apollo 14 breccias have been found to contain xenon from the spontaneous fission of 82 my 244 Pu. A third contains 60 times as much fission xenon as local uranium can account for and is probably of similar character. One of the breccias shows a 129 Xe excess most likely due to the decay of 17 my 129 I. That these components can be separated and identified at all implies that complete isotopic homogenization has not occurred over a period which encompasses both extinction of these radionuclides and compaction of the breccias into their final form. In this sense isotope pre-history has been preserved in some lunar breccias providing information that pre-dates the formation of the rock itself (as determined by conventional techniques). The gases are not due to in situ decay. They appear to have been implanted in the surface crustal layer of the primitive Moon nearly simultaneously with production by 244 Pu and 129 I decay in the lunar interior. The combination of these two radionuclides, whose relative abundance is strongly time dependent, form the basis of a new, extremely sensitive, dating scheme that establishes the time of implantation." @default.
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- W2004840285 date "1973-01-01" @default.
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- W2004840285 title "Extinct lunar radioactivities: Xenon from 244Pu and 129I in Apollo 14 breccias" @default.
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- W2004840285 doi "https://doi.org/10.1016/0012-821x(73)90213-6" @default.
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