New interpretation is given to the isotopic anomalies detected by Lugmair et al. in an acid-resistant residue of the Allende meteorite. If the ¹⁴²Nd excess is due to ¹⁴⁶Sm decay, as the discoverers proposed, the author argues that the decay has occurred in interstellar grains, so that the conclusion that ¹⁴⁶Sm (1.03×10⁸ yr) was alive in the solar system is premature. It is shown that the discovery is likely to be s-process Nd, confirming the survival of red-giant stardust in carbonaceous interstellar dust.
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D. D. Clayton (1983) studied this question.