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  • 1 Universität zu Köln Department of Nuclear Chemistry Zülpicher Str. 47 D-5000 Köln-1 (FRG)
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In experiments performed to simulate the interaction of cosmic radiation with matter, a great variety of high purity elemental foils and simple compounds were exposed to energetic charged and uncharged particles. In order to determine production rates of long-lived radionuclidesi such as10Be (1.6 My),22Na (2.602 y),26Al (0.72 My),41Ca (0.1 My),44Ti (47.3 y),53Mn (3.8 My), and59Ni (0.07 My), by means of -spectroscopy, --coincidence measurements, neutron activation techniques, as well as the recently developed method of accelerator mass spectrometry, radiochemical separations with high decontamination factors were carried out, lowering isotopic ratios of interfering short-lived radioisotopes and stable isobars to levels of up to 10–13. The separation methods applied include ion exchange, solvent extraction and the use of selective ion retention media as well as classical precipitation methods.