Abstract
Determinations of uranium and thorium in carbonaceous chondrites by neutron activation show that both uranium and thorium are inhomogeneously distributed within Type I and are generally homogeneously distributed within Type II carbonaceous chondrites. If Type I carbonaceous chondrites represent primitive solar material, then for the experimentally determined values of the ratio 232Th/238U either a continuous or sudden model of nucleosynthesis is plausible. The value of this ratio does, however, raise some problems.
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MORGAN, J., LOVERING, J. Uranium and Thorium Abundances in Carbonaceous Chondrites. Nature 213, 873–875 (1967). https://doi.org/10.1038/213873a0
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DOI: https://doi.org/10.1038/213873a0
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