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Radioactivity in returned lunar materialsThe H-3, Ar-37, and Ar-39 radioactivities were measured at several depths in the large documented lunar rocks 14321 and 15555. The comparison of the Ar-37 activities from similar locations in rocks 12002, 14321, and 15555 gives direct measures of the amount of Ar-37 produced by the 2 November 1969 and 24 January 1971 solar flares. The tritium contents in the documented rocks decreased with increasing depths. The solar flare intensity averaged over 30 years obtained from the tritium depth dependence was approximately the same as the flare intensity averaged over 1000 years obtained from the Ar-37 measurements. Radioactivities in two Apollo 15 soil samples, H-3 in several Surveyor 3 samples, and tritium and radon weepage were also measured.
Document ID
19720015162
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Date Acquired
August 6, 2013
Publication Date
February 1, 1972
Subject Category
Space Sciences
Report/Patent Number
NASA-CR-115503
SAPR-2
Accession Number
72N22812
Funding Number(s)
CONTRACT_GRANT: NGR-09-015-145
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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