Natural Uranium meaning

In legal practice, natural uranium refers to uranium in the isotopic proportions found in nature and is regulated as “source material” (i.e., neither enriched nor depleted), relevant to nuclear safeguards, export control, and the transport of radioactive material. By weight it comprises about 0.7% uranium‑235, 99.3% uranium‑238, and a trace of uranium‑234. Measured by radioactivity, it is approximately 2.2% uranium‑235, 48.6% uranium‑238, and 49.2% uranium‑234. The term is used descriptively across UK and Irish nuclear law and guidance and broadly follows IAEA/Euratom usage; UK nuclear safeguards legislation and Irish/EU Euratom instruments adopt equivalent concepts rather than materially different definitions. In practice, the classification of material as natural uranium determines licensing and reporting of holdings and transfers, export control treatment, transport classification and packaging, and environmental permitting for processing and storage. It covers uranium metal, compounds and concentrates (including U3O8/yellowcake) at natural assay, but excludes enriched uranium and depleted uranium. Usage is consistent across England & Wales, Scotland, Northern Ireland and Ireland, although procedural requirements (such as the competent authority, notifications, and specific permit routes) may differ between jurisdictions.