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DOI: 10.1016/j.nima.2021.165685
Keywords
Delayed gamma rays; Instrumentation; Safeguards; Fission products; Fissile nuclides
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- Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
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The collaboration between JAEA and EC/JRC on delayed gamma-ray spectroscopy has resulted in the development of the DGTS-C instrument for nuclear material accountancy. Experimental results confirm the practicality and effectiveness of this instrument design in enhancing safeguards capabilities.
The Japan Atomic Energy Agency (JAEA) is collaborating with the European Commission Joint Research Centre (EC/JRC) to develop delayed gamma-ray spectroscopy (DGS). Toward this, the JAEA Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) designed the Delayed Gamma-ray Test Spectrometer (DGTS) that uses a Cf-252 source (DGTS-C). This instrument is used to refine the design for a compact, induced-fission safeguards technique to supplement current nuclear material accountancy in reprocessing facilities. Experiments were performed at PERLA laboratory of the EC/JRC Ispra, Italy site to evaluate the neutron-irradiation and associated instrumentation capabilities to obtain delayed gamma-ray spectral signatures of assayed nuclear material. Neutron count-rate measurements were performed using a He-3 detector and confirmed with MCNP6 models that showed a fluence of similar to 87.1x10(-4) n cm(-2) n(src)(-1). Short time-pattern interrogations of various U-235 and Pu-239 samples resulted in quantifiable delayed gamma-ray peaks from fission products. The peak intensities and spectral signatures resulted in fissile nuclide distinction and linear mass-correlation results. Consequently, we confirm the practicality of this JAEA/ISCN instrument design for DGS interrogation safeguards capabilities.
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