Abstract
Nondestructive assay (NDA) techniques based on the detection of X rays and isotopic gamma rays have been investigated and applied both to elemental and isotopic concentration measurements on uranium and plutonium materials.In particular, the spectrometry of gamma rays from the natural radioactivity has been employed for fissile isotope concentration measurements in uranium and plutonium fuels, whereas both the analysis of induced X rays and the K-edge gamma densitometry technique have been used for elemental concentration measurements. Examples for the practical application of the analysis techniques are given.
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