The complete decommissioning of the AVR reactor facility at Forschungszentrum Jülich GmbH (HTGR type) raised the question of the radioactive inventory built up during and since the operational phase. Therefore, a precise chemical and radiochemical analysis system was developed at the Institute for Safety Research and Reactor Technology at Forschungszentrum Jülich with the aim of identifying and quantifying 45 nuclides from both metallic and ceramic materials. Separation schemes and details of apparatus are given. Chromatograms are shown resulting from high-performance liquid chromatography which was applied for the fine separation of most β-emitters and of those nuclides which decay via electron capture.

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