Abstract
Gamma scintillation spectrometry is known as a rapid and nondestructive method for determination of 235U enrichment. The method of the comparison of the ratio of the relative intensities of 184keV from 235U to 90 keV from 238U daughters is more accurate and sensitive for low enrichment than the method of the intensity of 184keV alone.
In this paper, using the low enriched uranium dioxide powder, the relationship between the enrichment and the peak ratio, which includes the correction of the experimental condition, was obtained by considering the uranium disintegration schemes and the data of the two standard samples.
Enrichments of 2.5% and 1.5% enriched uranium samples were determined by this relation. They show good agreements with the values informed by U.S. Atomic Energy Comission, supplier of these materials, within the error of ±1.2%.
