Abstract
We describe a method for the determination of long-lived tin isotopes arising from nuclear fission. The isotopes are extracted from sediments with hydrochloric acid and separated by methylisobutylketone extraction, ion-exchange chromatography, precipitation of cesium hexachlorostannate and ferric hydroxide coprecipitation. The 100 000-year 126Sn was not detected but beta activity consistent with 121mSn (55 year) was found in sediment samples from a location known to be contaminated with fission products.
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