THE ISOTOPIC COMPOSITION OF SILVER IN IRON METEORITES
Microgram quantities of silver were extracted from the troilite of Toluca iron meteorite and the metal phases of Sikhote Alin and Canyon Diablo meteorites using anionexchange techniques. Isotopic analysis of silver in iron meteorites indicates a 2-3% higher Ag/sup 107/Ag/sup 109/ ratio relative to the terrestrial silver. If this excess Ag/sup 107/ is attributed to the decay of the extinct radioactive nuclide Pd/sup 107/ an unreasonably short interval of time between the end of nucleosynthesis and the formation of iron meteorites is indicated. The silver isotopic anomaly in iron meteorites appears too large to be attributed entirely to Pd/sup 107/ produced in the galactic synthesis of elements, and may have to be interpreted in terms of a last-mInute contnibution of some amounts of short-lived radioactivities to the solar nebula, or by postulating that some Pd/sup 107/ was produced in the solar system in its early stages, after its separation from the galactic nucleosynthesis. (auth)
- Research Organization:
- Univ. of California, La Jolla, San Diego
- NSA Number:
- NSA-16-020829
- OSTI ID:
- 4828753
- Journal Information:
- Geochim. et Cosmochim. Acta, Journal Name: Geochim. et Cosmochim. Acta Vol. Vol: 26
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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ISOTOPIC COMPOSITION OF SILVER IN IRON METEORITES
Silver isotopic anomalies in iron meteorites: cosmic-ray production and other possible sources