[en] A nondestructive autoradiographic method is described which can provide a verification that rods in the interior of unirradiated LWR fuel assemblies contain low-enriched uranium. Sufficient absorber must be used to reduce contributions to image density by beta radiation from ²³⁸U daughters. When appropriate absorbers are used, the density of the image of a uranium-containing fuel rod is proportional to the ²³⁵U enrichment in that rod. Exposure times as short as 1.5 hours can be achieved by using fast film and intensifying screens. Methods are discussed for reducing contributions to the image density of any single rod from radiation produced by all other rods in the assembly. The technique is useful for detecting missing rods, dummy rods, and rods containing depleted uranium. These defects can be detected by visual inspection of the autoradiographs. In its present state of development, the technique is not sensitive enough to reliably detect the difference between the various ²³⁵U enrichments encountered in current BWR fuel assemblies. Results are presented for field tests of the technique at BWR and PWR facilities