Rare earths,other trace elements and iron in Luna 20 samples |
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| Authors: | Philip A Helmke Douglas P Blanchard Jeffrey W Jacobs Larry A Haskin |
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| Institution: | Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706 USA |
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| Abstract: | The results of the analysis by neutron activation of six samples from the Luna 20 mission and one sample of < 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 concentrations of Co, Sc and Cr are greater by factors ranging from 1.5 to 2.3. |
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