[en] A diversity of uranium-bearing, nonirradiated materials with ²³⁵U assays from fully depleted to a maximum of 10 wt % ²³⁵U, is routinely returned to this DOE site for reprocessing. It is necessary to confirm the ²³⁵U isotopic content of Special Nuclear Material (SNM) receipts both for accountability and nuclear criticality safety purposed. Methods and instrumentation have been developed for an isotopic verification facility by which ²³⁵U isotopic content is rapidly and nondestructively determined. The 185 keV gamma photon emitted by ²³⁵U is measured using a dual-channel gamma spectrometer which incorporates automatic background subtraction and an optimized collimator/NaI(Tl) detector assembly. Measured activities are then related to ²³⁵U isotopic content by means of appropriate standards that have been destructively analyzed in the laboratory. Use of the described facility for the past seven years has resulted in improved nuclear safety procedures, better use of storage space and more stringent nuclear materials accountability