Abstract

A procedure is described for the isolation, separation, and study of short-lived krypton and xenon isotopes formed by thermal fission of uranium. The gases are swept out from a thin film of uranium-235 stearate, rapidly separated by gas chromatography, and examined by gamma-spectrometric techniques. Krypton isotopes have been studied within 10 seconds of their formation in the reactor and xenon isotopes within 25 seconds. Spectra are reported for krypton-89 and -90, xenon-137, -138, and -139.

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