Development of the Neutron-Gamma-Neutron (NGN) approach for the fresh and spent fuel assay

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Development of the Neutron-Gamma-Neutron (NGN) approach for the fresh and spent fuel assay

Chernikova, Dina, 1982 (författare): Chalmers tekniska högskola,Chalmers University of Technology

Romodanov, Vadim (författare)

Sakharov, Valeriy (författare)

(creator_code:org_t)

2012
2012
Engelska.
Ingår i: Proceedings of The 53nd Annual Meeting of the Institute of Nuclear Materials Management.

Relaterad länk:: https://research.cha...

Konferensbidrag (övrigt vetenskapligt/konstnärligt)

Abstract Ämnesord

Stäng

In connection with current safety and complexity limitations for installations which usekeV neutrons for irradiation in the fresh and spent fuel assay, in medicine, geophysicaland detection fields, there is a long felt need of effective, light, inexpensive systems withlonger lifetimes and the possibility to ”switch off” the source during transportation andwork break. The present paper discusses an opportunity of creating a novel technique basedon using a pulsed neutron generator, hydrogen moderator and beryllium, which will enablecreation of a compact and inexpensive facility capable to satisfy all requirements. The mainidea of the proposed method consists in using photonuclear reaction in beryllium due togamma irradiation originating from (n,gamma) reaction in a hydrogen containing moderator.After the neutron pulse of a modern compact DD neutron generator in hydrogen-containingmoderator, high-energy neutrons (approximately 2.5 MeV) get slowed down mainly by elasticscattering to near thermal energies. At thermal energies, the neutrons diffuse through thematerial until they undergo thermal capture (capture is dominated by hydrogen neutronabsorbers). When a hydrogen atom captures a thermal neutron, it turns into deuteriumwith the release of a large component of 2.23 MeV gamma-rays. Beryllium is one of thefew elements in nature that undergoes a photonuclear reaction with this gamma energyrange (e.g. deuterium has a low energy 2.225 MeV photonuclear threshold). Thus, as theberyllium has lower neutron-binding energy, 1.667 MeV (photonuclear reaction threshold),a photonuclear reaction will take place with emission of neutrons with energy defined by thekinematic equation. Thus, this method allows to obtain a high quality epithermal neutronbeam without using a complex system with particle accelerator or radioisotope sources withlimited decay time. The proposed method has been studied using Monte Carlo simulations,which made it possible to define the theoretical limits of the use of the NGN approach inindustrial applications. The paper will presents the results of these investigations.

Ämnesord

TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Annan teknik -- Övrig annan teknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies -- Other Engineering and Technologies not elsewhere specified (hsv//eng)

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Av författaren/redakt...: Chernikova, Dina ...; Romodanov, Vadim; Sakharov, Valeri ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Annan teknik

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Annan teknik; och Övrig annan tekn ...

Artiklar i publikationen: Proceedings of T ...

Av lärosätet: Chalmers tekniska högskola

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