Abstract
For the purpose of nuclear security and safeguards, an active neutron interrogation non-destructive assay technique, Delayed Gamma-ray Spectroscopy (DGS), is under development. The technique of DGS uses the detection of decay γ rays from fission products to determine ratios of fissile nuclides in a sample. A proper evaluation of such γ-ray spectra requires integration of nuclear data such as fission cross-sections, fission yields, half-lives, decay-chain patterns, and decay γ-ray yields. Preliminary DGS experiments with the Pulsed Neutron Interrogation Test Assembly, named PUNITA, of the European Commissions’ Joint Research Center have been performed. Signals of delayed γ ray from nuclear materials were successfully observed.
Highlights
Due to the global increase of applications using nuclear materials (NMs), the requirements of effective characterization methods is growing in nuclear security and safeguards
This paper describes the Delayed Gamma-ray Spectroscopy (DGS) development program and a e-mail: koizumi.mitsuo@jaea.go.jp experimental results of DGS carried out with the Pulsed Neutron Interrogation Test Assembly (PUNITA) [9, 10] of European Commission’s Joint Research Center (EC-JRC) in Ispra
This nondestructive analysis (NDA) method is especially useful for measurement of a sample accompanied with radioactivity, where a conventional passive low-energy γ -ray spectroscopic method cannot be applied
Summary
Due to the global increase of applications using nuclear materials (NMs), the requirements of effective characterization methods is growing in nuclear security and safeguards. Mass verification of NMs with low radioactivity is generally performed using passive nondestructive analysis (NDA) techniques whereas destructive analysis (DA) techniques are applied for accurate analysis of nuclide composition. A sample with high radioactivity, has a difficulty in characterization by passive NDA methods. Active NDA techniques, which utilize interrogation particles (such as photons and neutrons) to induce nuclear reactions, are potentially applicable to extract information of NMs in a high radioactive sample. Such active interrogation methods could be used for the detection of clandestine NM
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