Plutonium-244 in the early solar system and the Pre-Fermi natural reactor.

Formation of the Solar System from heterogeneous debris of a supernova (SN) that exploded 5 billion years ago was recorded as (1) inter-linked chemical and isotopic heterogeneities in meteorites, (2) higher levels of extinct nuclides in grains that trapped larger isotopic anomalies, (3) the physical properties of grains mentioned in part (2), and (4) patterns of isotopic anomalies in meteorites, in the solar-wind, and in solar flare particles. The Sun formed on the SN core, and planets formed in a rotationally-supported, equatorial disk of SN debris. Interiors of the Sun and the inner planets accreted first in a central, Fe-rich region surrounding the SN core. These were layered as condensate from other parts of the SN fell toward the condensing Sun. Elements in outer SN layers formed low-density, giant Jovian planets. Intra-solar diffusion enriches hydrogen and lighter isotopes of individual elements at the Sun's surface.

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Plutonium-244 fission xenon and primordial xenon in lunar samples and meteorites

Kuroda

Myers

1998

J Radioanal Nucl Chem

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Xenon found in lunar samples is a binary mixture of 244pu fission xenon and a trapped xenon, whose isotopic composition often show-s a striking resemblance to that of TAKAOKA's 1 primitive xenon. The decay product of 129I is conspicuously absent in lunar samples and this may be attributed to the facts that (a) the half-life of 129I is much shorter than that of 244pu, and (b) the separation of xenon from plutonium may take place easily, since the former is a gaseous element, while the latter is a refractory element. The separation of xenon from iodine may not tale place easily, however, since the former is a gaseous element, while the latter is a volatile element. The isotopic compositions of the trapped xenon released from ordinary chondrites and achondrites resemble that of TAKA 9 primitive xenon, which has been mass-fractionated in such a manner that the heavier isotopes are systematically enriched relative to the lighter isotopes.

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Plutonium-244 in the early solar system and the Pre-Fermi natural reactor.

Cited by 4 publications

References 90 publications

Extraterrestrial radioactivity

Extraterrestrial radioactivity

Origin of the Solar System and its elements

Plutonium-244 fission xenon and primordial xenon in lunar samples and meteorites

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