Abstract
A technique has been developed to verify the enrichment of gaseous UF 6 inside cylinders. This technique combines an X-ray fluorescent measurement of the total amount of gaseous uranium with a measure of the 185.7 keV gamma ray from 235U using two collimators to obtain an enrichment that is independent of the pressure of the gaseous uranium and independent of the deposit that forms on a surface in contact with UF 6. This technique has the required sensitivity to determine whether the process gas is of uranium enrichment ≤ 20% or >20%.
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