Development of Active Neutron NDA Techniques for Nuclear Nonproliferation and Nuclear Security (3) Study on a High Energy DGS System

Year
2016
Author(s)
Michio Seya - Japan Atomic Energy Agency
Hironobu Nakamura - Japan Atomic Energy Agency
Masatoshi Kureta - Japan Atomic Energy Agency
Mitsuo Koizumi - Japan Atomic Energy Agency
Jun Takamine - Japan Atomic Energy Agency
Douglas C. Rodriguez - Japan Atomic Energy Agency
Fabiana Rossi - Japan Atomic Energy Agency
Abstract
The JAEA and EC-JRC have started a collaboration program for the development of active neutron non-destructive assay (NDA) techniques, including Delayed Gamma-ray Spectroscopy (DGS), for analyzing the composition ratio of fissile nuclides (e.g. 235U, 239Pu, and 241Pu). DGS analyzes the measured delayed gamma-rays (DG) (focusing on those with energy higher than 3 MeV) that originate from short-lived fission products produced by neutron interrogation. Utilizing signatures in the resulting DG spectra, it is possible to then obtain the unique contribution, and therefore ratio, of the fissile nuclides. This presentation introduces the overview of the development of DGS, preliminary studies on the analysis of fissile nuclide ratios from the measured DG spectra, the experimental plan of measuring DG spectra for seeking improvements on the differences between fissile nuclides, and design studies on moderation of the 14 MeV neutrons from a D-T source.