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Nuclear forensics can often trace enriched uranium back to its production facility or at least to a small set of likely sources, though it is not always 100% certain.
How tracing works
Isotopic “fingerprint”: Enriched uranium has a characteristic ratio of uranium isotopes (U‑235, U‑238, sometimes U‑234) that depends on the type and efficiency of the enrichment process and the target enrichment level.
Chemical and impurity signatures: Trace impurities, minor elements, and chemical forms (oxide, metal, hexafluoride, etc.) can reflect particular ore types, refining methods, and plant practices.
Process history clues: The exact enrichment pattern (for example, how much U‑234 is present, or how the isotopic ratios vary across a sample) can indicate whether it was made in gaseous diffusion, gas centrifuges, or other methods that are characteristic of certain states and facilities.
By comparing these signatures to a database of known materials from declared plants, analysts can often narrow down where the material was likely produced. In one famous case, highly enriched uranium found near Israel’s Dimona site was argued to match material from the Portsmouth, Ohio plant in the United States.
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