The nuclear nonproliferation community is making a continuous effort in research and development of Non Destructive Assay (NDA) techniques to determine the isotopic composition of nuclear fuels, with particular interest in spent nuclear fuel, in order to determine plutonium, uranium and fission product concentrations [1] Active interrogation NDA techniques using external neutron sources to induce nuclear reactions in the fuel with subsequent neutron/gamma detection proved to be well suited for such investigations and include techniques such as Differential Die-away (DDA), Delayed Neutrons (DN), Delayed Gamma (DG) and Prompt Gamma Analysis (PGA) Another NDA technique based on external neutron sources that has shown recent revived interest after first demonstration in 1970s [2] is Neutron Resonance Transmission Assay (NRTA) [3,4] In this paper we present current progress and results of isotope specific characterization using NRTA measurements on enriched fuels.
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