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  • 1 Österreichische Akademie der Wissenschaften Institut für Radiumforschung und Kernphysik A-1090 Vienna Austria
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In the course of our work within the framework of an interdisciplinary project dealing with the absolute dating of fossil bones from Austrian caves by means of the U-series method we became interested in possible U-concentration gradients in the bone samples. A successful attempt is reported to make the U-distribution in bones directly visible by irradiating the samples with thermal neutrons and detecting the emitted fission products of235U in a plastic foil using the track etch method. This turns out to be possible also for relatively small U-concentrations of the order of 1 ppm. The uranium seems to concentrate near the surfaces which is in qualitative agreement with earlier results from the literature obtained by means of neutron activation analysis.