PNNL

Abstract

This work aims to characterize features that contribute to the spectral variations that appear in gamma-ray spectra of filled uranium hexafluoride (UF6) cylinders. While the enrichment of the UF6 in a cylinder can greatly affect gamma-ray spectra at peaks such as the 185.7 keV peak and be used to verify enrichment, many other characteristics of a filled UF6 cylinder can affect the spectra. These characteristics vary on a per-cylinder basis and can include: the time between when a cylinder was filled and when it was measured; the previous fill history of a cylinder; how the cylinder was most recently filled; the UF6 geometric distribution within the cylinder; and the measurement location along the cylinder.