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- W34893303 abstract "The initial Pu/U ratio of the solar system is an important parameter in models of nucleosynthesis, mantle evolution and cosmochronology. Current estimates are based on analyses of the chondrite St Severin and the achondrite Angra dos Reis and are poorly constrained, ranging from 0.004 to 0.008. On account of its short, 82 Ma, half-life, Pu was essentially extinct 3,900 Ma ago, and consequently there exists no reliable measurement of Pu/U for the Earth. The discovery of zircons dating from the period when Pu was ‘live’ offers an opportunity to measure the former terrestrial abundance of Pu directly by way of fissiogenic xenon isotopes. The expected levels of fission xenon in individual zircons, (1 to 4 μg, 100 – 200 ppm U), are comparable to, the Xe blank levels (~10 ccSTP) typical of conventional noble gas mass spectrometers. To analyse these minute amounts of xenon we have made use of laser resonance ionisation using the RELAX mass spectrometer. We have carried out preliminary analyses of 3 individual 4,150 Ma zircons and one 3,600 Ma zircon from Western Australia, and obtained four clear fission spectra. All were free from significant atmospheric blank (Xe was less than 4x10 ccSTP, i.e. 100 atoms). The spectra of the older zircons clearly demonstrated the presence of varying proportions of Pu fission xenon." @default.
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- W34893303 date "2003-07-01" @default.
- W34893303 modified "2023-09-23" @default.
- W34893303 title "Extinct 244Pu in Ancient Terrestrial Zircons" @default.
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