Developments of analytical techniques for the determination of 237Np/239Pu atom ratios on air filters from Vienna,
Gabriele Wallner1, Philipp Rohrbach1, Leo J Krammer1
1Faculty of Chemistry, Institute of Inorganic Chemistry, University of Vienna, Währingerstr. 42, A-1090, Vienna, Austria.
Abstract:
Air filter samples collected in the 1960s and therefore representing pure weapons test fallout were investigated with respect to 237Np and 239Pu concentrations as well as 237Np/239Pu atom ratios. 237Np and the Pu isotopes (with 242Pu as tracer for both elements) were jointly separated from the matrix using UTEVA resin and were then measured by accelerator mass spectrometry (AMS). Results were normalized to external standards to consider different Np and Pu outputs during the measurement. The resulting 237Np/239Pu atom ratios were slightly higher than the 237Np/239Pu ratios of soil samples from literature. As the radiochemical yields of Np as well as of Pu, investigated by α-spectrometry of samples with added 237Np and 236Pu tracers, indicated chemical fractionation, the filter samples were for comparison also normalized to IAEA-385 reference samples which had been processed collaterally. When using the revised literature value for the 237Np/239Pu ratio of IAEA-385, accordance with the results obtained by normalization to the external standards was found.
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