Advanced Enrichment Monitoring Technology Based on Transmission Measurements with an X-ray Source and NaI(Tl) Spectrometer

In this paper, we report our progress toward the development of an advanced enrichment monitoring technology for safeguarding gas centrifuge enrichment plants. We compare the ${\rm UF}_{6}$ gas pipe attenuation and sensitivity to X-ray tube HV variations for two transmission energies: 22 keV and 25.5 keV. The first experimental enrichment results taken with a static ${\rm UF}_{6}$ gaseous source and X-ray tube based transmission source over a wide gas pressure range are presented.