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Primordial radioelements and cosmogenic radionuclides in lunar samples from Apollo 15.Two basalts, two breccias, and two soils from Apollo 15 were analyzed by nondestructive gamma-ray spectrometry. The concentrations of potassium, thorium, and uranium in the basalts were similar to those in the Apollo 12 basalts, but the potassium:uranium ratios were somewhat higher. Primordial radioelements were enriched in the soils and breccia, consistent with a two-component mixture of mare basalt and up to 20 percent foreign component (KREEP). The abundance patterns for cosmogenic radionuclides implied surface sampling for all specimens. The galactic cosmic-ray production rate of vanadium-48 was determined as 57 (plus or minus 11) disintegrations per minute per kilogram of iron. Cobalt-56 concentrations were used to estimate the intensity of the solar flare of January 25, 1971.
Document ID
19720034608
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
O'Kelley, G. D.
Eldridge, J. S.
Northcutt, K. J.
(Oak Ridge National Laboratory Oak Ridge, Tenn., United States)
Schonfeld, E.
(NASA Manned Spacecraft Center Houston, Tex., United States)
Date Acquired
August 6, 2013
Publication Date
January 28, 1972
Publication Information
Publication: Science
Volume: 175
Subject Category
Space Sciences
Accession Number
72A18274
Distribution Limits
Public
Copyright
Other

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