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Journal Articles

NRD demonstration experiments at GELINA

Paradela, C.*; Alaerts, G.*; Becker, B.*; Harada, Hideo; Heyse, J.*; Kitatani, Fumito; Koizumi, Mitsuo; Kopecky, S.*; Mondelaers, W.*; Moens, A.*; et al.

EUR-27507-EN, 16 Pages, 2015/04

Journal Articles

Development of NRD, 2; Investigation on systematic effects due to sample thickness for areal density derived from NRTA

Tsuchiya, Harufumi; Harada, Hideo; Koizumi, Mitsuo; Kitatani, Fumito; Takamine, Jun; Kureta, Masatoshi; Iimura, Hideki; Kimura, Atsushi; Becker, B.*; Kopecky, S.*; et al.

Kaku Busshitsu Kanri Gakkai (INMM) Nippon Shibu Dai-35-Kai Nenji Taikai Rombunshu (Internet), 9 Pages, 2015/01

We are developing neutron resonance densitometry that combines neutron resonance transmission analysis (NRTA) and neutron resonance capture analysis. The aim is to establish a non-destructive technique that can quantify nuclear materials in particle-like debris of melted fuel resulting from severe nuclear accidents like the one at the Fukushima Daiichi Nuclear Power Plant. Systematic effects due to sample thickness and mixed sample for the areal density measurement by NRTA were investigated at a neutron time-of-facility GELINA, IRMM. The experiments were conducted utilizing natural Cu metal discs with different thickness and a B$$_{4}$$C disc. Areal densities were derived with a resonance shape analysis code REFIT. It was found that they were inconsistent with those calculated by mass and area, when using recommended resonance parameters. Hence, a neutron width of resonance parameters was newly evaluated with the NRTA data and we found that derived areal density agreed within 2% with the expected ones. We also discuss the impacts of mixed sample for the areal density derived from NRTA measurement.

Journal Articles

Thickness and mixed sample effects on areal density measurement with NRTA for particle like debris of melted fuel

Tsuchiya, Harufumi; Harada, Hideo; Koizumi, Mitsuo; Kitatani, Fumito; Takamine, Jun; Kureta, Masatoshi; Iimura, Hideki; Kimura, Atsushi; Becker, B.*; Kopecky, S.*; et al.

Proceedings of INMM 55th Annual Meeting (Internet), 6 Pages, 2014/07

Journal Articles

Development of neutron resonance densitometry

Harada, Hideo; Schillebeeckx, P.*; Tsuchiya, Harufumi; Kitatani, Fumito; Koizumi, Mitsuo; Takamine, Jun; Kureta, Masatoshi; Iimura, Hideki; Kimura, Atsushi; Seya, Michio; et al.

Proceedings of INMM 55th Annual Meeting (Internet), 8 Pages, 2014/07

Journal Articles

Particle size inhomogeneity effect on neutron resonance densitometry

Becker, B.*; Harada, Hideo; Kauwenberghs, K.*; Kitatani, Fumito; Koizumi, Mitsuo; Kopecky, S.*; Moens, A.*; Schillebeeckx, P.*; Sibbens, G.*; Tsuchiya, Harufumi

ESARDA Bulletin, (50), p.2 - 8, 2013/12

Journal Articles

Development of neutron resonance densitometry at the GELINA TOF facility

Schillebeeckx, P.*; Abousahl, S.*; Becker, B.*; Borella, A.*; Emiliani, F.*; Harada, Hideo; Kauwenberghs, K.*; Kitatani, Fumito; Koizumi, Mitsuo; Kopecky, S.*; et al.

ESARDA Bulletin, (50), p.9 - 17, 2013/12

Journal Articles

Investigation on sample thickness effect on nuclear material quantification with NRTA for particle-like debris of melted fuel

Tsuchiya, Harufumi; Harada, Hideo; Koizumi, Mitsuo; Kitatani, Fumito; Takamine, Jun; Kureta, Masatoshi; Iimura, Hideki; Becker, B.*; Kopecky, S.*; Kauwenberghs, K.*; et al.

Kaku Busshitsu Kanri Gakkai (INMM) Nippon Shibu Dai-34-Kai Nenji Taikai Rombunshu (Internet), 8 Pages, 2013/10

We have no established methods to quantify the amount of nuclear materials in particle-like debris of melted fuel derived from a nuclear accident such as the one occurred at the Fukushima Daiichi Nuclear Power Plant. For this reason, neutron resonance densitometry, combining neutron resonance transmission analysis and neutron resonance capture analysis, is under development. It is expected that such debris have a wide variety of size, shape, and concentration of impurities. Experiments with the Neutron Resonance Transmisson Analysis (NRTA) using three Cu metal disks with different thickness of 0.125 mm, 0.25 mm, and 0.7 mm were made between November 2012 and February 2013 at the Geel Electron LINear Accelerator (GELINA) to investigate sample thickness effect on the transmission analysis. We experimentally derived the areal density for the individual Cu samples with the resonance shape analysis code REFIT, and then compared them with the declared areal density. It was found that the REFIT-evaluated areal density was consistent with declared ones for each sample.

Journal Articles

Sample thickness effect on nuclear material quantification with NRTA for particle like debris of melted fuel

Tsuchiya, Harufumi; Harada, Hideo; Koizumi, Mitsuo; Kitatani, Fumito; Takamine, Jun; Kureta, Masatoshi; Iimura, Hideki; Becker, B.*; Kopecky, S.*; Kauwenberghs, K.*; et al.

Proceedings of INMM 54th Annual Meeting (CD-ROM), 6 Pages, 2013/07

Journal Articles

Contribution of the JRC to the development of neutron resonance densitometry to characterize melted fuel from severe accidents

Schillebeeckx, P.*; Becker, B.*; Emiliani, F.*; Kopecky, S.*; Kauwenberghs, K.*; Moens, A.*; Mondelaers, W.*; Sibbens, G.*; Harada, Hideo; Kitatani, Fumito; et al.

Proceedings of INMM 54th Annual Meeting (CD-ROM), 7 Pages, 2013/07

Journal Articles

Contribution of the JRC to the development of neutron resonance densitometry to characterize melted fuel from severe accidents

Schillebeeckx, P.*; Becker, B.*; Emiliani, F.*; Kopecky, S.*; Kauwenberghs, K.*; Moens, A.*; Mondelaers, W.*; Sibbens, G.*; Harada, Hideo; Kitatani, Fumito; et al.

Proceedings of INMM 54th Annual Meeting (CD-ROM), 7 Pages, 2013/07

Journal Articles

Particle size inhomogeneity effect on neutron resonance densitometry

Becker, B.*; Harada, Hideo; Kauwenberghs, K.*; Kitatani, Fumito; Koizumi, Mitsuo; Kopecky, S.*; Moens, A.*; Schillebeeckx, P.*; Sibbens, G.*; Tsuchiya, Harufumi

Proceedings of 35th ESARDA Annual Meeting (Internet), 7 Pages, 2013/05

Journal Articles

Development of neutron resonance densitometry at the GELINA TOF facility

Schillebeeckx, P.*; Abousahl, S.*; Becker, B.*; Borella, A.*; Emiliani, F.*; Harada, Hideo; Kauwenberghs, K.*; Kitatani, Fumito; Koizumi, Mitsuo; Kopecky, S.*; et al.

Proceedings of 35th ESARDA Annual Meeting (Internet), 11 Pages, 2013/05

Oral presentation

A Conceptual NRD system and its performance evaluation

Tsuchiya, Harufumi; Harada, Hideo; Koizumi, Mitsuo; Kitatani, Fumito; Kureta, Masatoshi; Takamine, Jun; Iimura, Hideki; Kimura, Atsushi; Becker, B.*; Heyse, J.*; et al.

no journal, , 

Neutron Resonance Densitometry (NRD) is a non-destructive method using a pulsed neutron beam in order to quantify nuclear materials in particle-like debris of melted fuel that is generated by a severe accident like the one at the Fukushima Daiichi Nuclear Power Plant. It is a combination of neutron resonance transmission analysis (NRTA) and neutron resonance captures analysis (NRCA) or Prompt Gamma-ray Analysis (PGA). NRCA/PGA in NRD, using a newly designed $$gamma$$-ray detector, plays a role of measuring impurities in debris that would have high radioactivity derived from $$^{137}$$Cs. Especially, the $$gamma$$-ray detector was specially designed to measure 478-keV $$gamma$$ rays radiated by $$^{10}$$B under the presence of $$^{137}$$Cs. Then utilizing information on the amount of impurities obtained by NRCA/PGA, NRTA quantifies special nuclear materials in debris. To verify the effectiveness of NRD for quantifying nuclear materials, NRTA and NRCA/PGA experiments were conducted at GELINA, IRMM, by an international collaboration of JAEA and EC/JRC/IRMM. In addition, achievable accuracy concerning NRD was studied by Monte Carlo simulations. In this contribution, these achievements on NRD as well as its concept are reviewed.

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