Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old on JSTOR

Science

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Coverage: 1880-2012 (Vol. 1, No. 1 - Vol. 338, No. 6114)

Moving Wall: 5 years (What is the moving wall?)

The "moving wall" represents the time period between the last issue available in JSTOR and the most recently published issue of a journal. Moving walls are generally represented in years. In rare instances, a publisher has elected to have a "zero" moving wall, so their current issues are available in JSTOR shortly after publication.
Note: In calculating the moving wall, the current year is not counted.
For example, if the current year is 2008 and a journal has a 5 year moving wall, articles from the year 2002 are available.

Terms Related to the Moving Wall: Fixed walls: Journals with no new volumes being added to the archive.; Absorbed: Journals that are combined with another title.; Complete: Journals that are no longer published or that have been combined with another title.

ISSN: 00368075

EISSN: 10959203

Subjects: Science & Mathematics, Biological Sciences, General Science

Collections: Health & General Sciences Collection, Life Sciences Collection

Abstract

Tracks attributed to the spontaneous fission of plutonium-244 and of uranium-238 were detected in a large whitlockite crystal in the lunar breccia 14321 from the Fra Mauro formation. For a track-retention age of 3.95 × 10$^{9}$ years the number of plutonium tracks relative to the number of uranium tracks is 0.51 ± 0.15, provided that the rock was not heavily neutron-irradiated 3.95 × 10$^{9}$ years ago.

Plutonium-244 Fission Tracks: Evidence in a Lunar Rock 3.95 Billion Years Old

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Abstract