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Here we present a nuclear forensic study of uranium from German nuclear projects which used different geometries of metallic uranium fuel.,, Through measurement of the 230Th/234U ratio, we could determine that the material had been produced in the period from 1940 to 1943. To determine the geographical origin of the uranium, the rare-earth-element content and the 87Sr/86Sr ratio were measured. The results provide evidence that the uranium was mined in the Czech Republic. Trace amounts of 236U and 239Pu were detected at the level of their natural abundance, which indicates that the uranium fuel was not exposed to any major neutron fluence. [ABSTRACT FROM AUTHOR]

Nuklearforensik verfolgt die Spur zweier Uranblöcke zu den ersten deutschen Kernreaktionsexperimenten in den 1940er Jahren zurück. In der Zuschrift auf S. 13654 ff. vergleichen M. Wallenius et al. die makroskopischen Eigenschaften der Proben mit Literaturangaben, und sie bestimmen den Herstellungszeitpunkt und die Uranquelle. [ABSTRACT FROM AUTHOR]

Nuclear forensics was used to trace the history of two pieces of uranium metal, which are purported to originate from the first German nuclear reaction experiments in the 1940s. In their Communication on page 13452 ff., M. Wallenius et al. compared the macroscopic sample properties with literature information and determined the production date and source of the uranium samples. [ABSTRACT FROM AUTHOR]