Computer Science
Scientific paper
Aug 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..14..118b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 14, Issue 1-2, pp.118-125
Computer Science
2
Scientific paper
By means of neutron activation analysis, thorium concentrations in two iron meteorites have been found in the approximate range of from 6 × 10 -12 to 20 × 10 -12 g Th / g meteorite. These values are lower by at least two orders of magnitude than previously determined levels of thorium concentration in irons. It is possible that the wide divergence of results must be attributed to differences in method, and evidence is presented in support of the validity of the method of neutron activation analysis. If calculated value for the distribution coefficient of thorium between iron and silicate phases is correct, the present thorium data seem to further substantiate the view that thorium in irons occurs primarily in inclusions or in thorium compounds dissolved in the iron. Comparison with uranium concentrations in irons recently determined by neutron activation analysis suggests moreover that if the thorium is accounted for by inclusions, these inclusions are not primarily silicate in nature; or if thorium is attributable to dissolved thorium compounds, the solubility of thorium compounds is less than that of uranium compounds in the original molten iron phase.
Bate George L.
Huizenga J. R.
Potratz H. A.
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