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Extinct lunar radio activities - Xenon from Pu-244 and I-129 in Apollo 14 breccias.Two Apollo 14 breccias have been found to contain xenon from the spontaneous fission of 82 my Pu-244. 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 Xe-129 excess most likely due to the decay of 17 my I-129. 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).
Document ID
19730036041
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Behrmann, C. J.
Drozd, R. J.
Hohenberg, C. M.
(Washington University St. Louis, Mo., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 17
Issue: 2, Ja
Subject Category
Chemistry
Accession Number
73A20843
Funding Number(s)
CONTRACT_GRANT: NGL-26-008-065
CONTRACT_GRANT: NSF GU-1147
Distribution Limits
Public
Copyright
Other

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