The document describes analytical methods used to analyze a seized shipment of highly enriched uranium intercepted in Prague in 1994. Key findings include: - Isotopic analysis found the uranium to be 87.7% enriched in U-235. Trace impurities and age dating also provided insights. - Microscopy revealed irregular porous particles less than 1mm, with a microcrystal structure. - Results helped attribute the material's origin and established it as a potential intermediate product for further nuclear applications. The case highlighted the value of forensic analysis of illicit nuclear materials.