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Isotopic abundances of actinide elements in lunar material |
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| Authors: | Fields P R Diamond H Metta D N Stevens C M Rokop D J Moreland P E |
| Abstract: | The abunldanzces of uranium and thorium were measured mass spectrometrically as 0.59 +/- 0.02 and 2.24 +/- 0.06 parts per million, respectively, in the fines of Apollo 11 builk sample. The ratio (235)U/(238)U was 0.007258 +/- 0.000016, in agreement with terrestrial uranium. The following upper limits were set: (236)U/(238)U |
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