Pulsed Neutron Facility for Research in Illicit Trafficking and Nuclear Safeguards

Favalli, Andrea; Mehner, H.-C.; Crochemore, J.-M.; Pedersen, B.

doi:10.1109/tns.2009.2015297

Cited by 24 publications

(34 citation statements)

References 5 publications

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“…DGS experiments were carried out with PUNITA [9,10], which consists of a large graphite inner box and a high density polyethylene (HDPE) outer box. The inside of the box is a sample cavity of 50 cm in width (W), 50 cm in length (L), and 80 cm in height (H).…”

Section: Dgs Experiments With Punitamentioning

confidence: 99%

“…Technical developments of those methods are in progress under the collaboration with the European Commission's Joint Research Center (EC-JRC). This paper describes the 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 EC-JRC in Ispra.…”

Section: Introductionmentioning

confidence: 99%

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Delayed gamma-ray spectroscopy combined with active neutron interrogation for nuclear security and safeguards

et al. 2017

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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.

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Section: Dgs Experiments With Punitamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delayed gamma-ray spectroscopy combined with active neutron interrogation for nuclear security and safeguards

et al. 2017

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“…This is a problem in most applications where the neutron-gamma separation of 3 He detectors had been essential. This challenge is especially severe for neutron coincidence and Differential Die-Away (DDA) [6] measurement techniques that have numerous conflicting requirements such as high detection efficiency, short die-away time, short dead time, and high stability.…”

Section: Introductionmentioning

confidence: 99%

“…The classical approach of using 6 Li scintillation-clad fibers did not provide good gamma/neutron separation [9]. The idea of reducing the gamma sensitivity of 6 Li glass scintillators by embedding small glass particles in an organic light-guide medium was first proposed by L.M. Bollinger in the early 60s but, to the best of our knowledge, has never been reduced to practice [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Neutron detector based on Particles of 6Li glass scintillator dispersed in organic lightguide matrix

Ianakiev

Hehlen

Swinhoe

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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Q3detectors 6 Li glass Neutron/gamma separation 3 He replacement Nuclear safeguards Neutron coincidence counters Active interrogation a b s t r a c t Most 3 He replacement neutron detector technologies today have overlapping neutron-gamma pulseheight distributions, which limits their usefulness and performance. Different techniques are used to mitigate this shortcoming, including Pulse Shape Discrimination (PSD) or threshold settings that suppress all gammas as well as much of the neutrons. As a result, count rates are limited and dead times are high when PSD is used, and the detection efficiency for neutron events is reduced due to the high threshold. This is a problem in most applications where the neutron-gamma separation of 3 He detectors had been essential. This challenge is especially severe for neutron coincidence and multiplicity measurements that have numerous conflicting requirements such as high detection efficiency, short dieaway time, short dead time, and high stability. 6 Li-glass scintillators have excellent light output and a single peak distribution, but they are difficult to implement because of their gamma sensitivity. The idea of reducing the gamma sensitivity of 6 Li-glass scintillators by embedding small glass particles in an organic light-guide medium was first presented by L.M. Bollinger in the early 60s but, to the best of our knowledge, has never been reduced to practice. We present a proof of principle detector design and experimental data that develop this concept to a large-area neutron detector. This is achieved by using a multi-component optical medium ( 6 Li glass particles attached to a glass supporting structure and a mineral oil light guide) which matches the indices of refraction and minimizes the absorption of the 395 nm scintillator light. The detector design comprises a 10 in. long tube with dual end readout with about 3% volume density of 6 Li glass particles installed. The presented experimental data with various neutron and gamma sources show the desired wide gap between the neutron and gamma pulse height distributions, resulting in a true plateau in the counting characteristics similar to that of 3 He detectors.

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Non-classical applications of chemical analysis based on nuclear activation

Grdeń

2019

J Radioanal Nucl Chem

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Pulsed Neutron Facility for Research in Illicit Trafficking and Nuclear Safeguards

Cited by 24 publications

References 5 publications

Delayed gamma-ray spectroscopy combined with active neutron interrogation for nuclear security and safeguards

Delayed gamma-ray spectroscopy combined with active neutron interrogation for nuclear security and safeguards

Neutron detector based on Particles of 6Li glass scintillator dispersed in organic lightguide matrix

Non-classical applications of chemical analysis based on nuclear activation

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