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Spatially resolved analysis of uranium isotopes in small volumes ofactinide-bearing materials is critical for a variety of technical disciplines,including earth and planetary sciences, environmental monitoring,bioremediation, and the nuclear fuel cycle. However, achieving sub-nanometerscale spatial resolution for such isotopic analysis is currently a challenge.By using atom probe tomography, a three dimensional nanoscale characterizationtechnique, we demonstrate unprecidented nanoscale mapping of uranium isotopicenrichment with high sensitivity across various microstructural interfaceswithin small volumes (100 nm3) of depleted and low enriched uranium alloyedwith 10 wt % molybdenum with different nominal enrichments of 0.20 and 19.75%235U respectively. The approach presented here can be applied to studynanoscale variations of isotopic abundances in the broad class ofactinide-bearing materials, providing unique insights into their origin andthermo-mechanical processing routes.

Nanoscale spatially resolved mapping of uranium enrichment in actinide-bearing materials