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Rare earths, other trace elements and iron in Luna 20 samples. (1973)

Jacobs, J. W. ; Blanchard, D. P. ; Helmke, P. A. ; [et al.]

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Publication Date: 2019-06-27

Description: The results of the analysis by neutron activation of six samples from the Luna 20 mission and one sample of less than 1 mm fines from Apollo 16 are reported. The concentrations of the rare-earth elements (REE) in the samples of fines from Luna 20 and Apollo 16 are less than those found for corresponding materials from the mare areas but a negative Eu anomaly is still present. The concentrations of the REE in fines from Luna 20 are only about two-thirds as great as in the sample of Apollo 16 fines, but the concentration of Co, Sc and Cr are greater by factors ranging from 1.5 to 2.3.

Keywords: SPACE SCIENCES

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