NECTAR—A fission neutron radiography and tomography facility

Bücherl, T.; Gostomski, Ch. Lierse von; Breitkreutz, Harald; Jungwirth, M.; Wagner, F.M.

doi:10.1016/j.nima.2011.01.058

Cited by 29 publications

(19 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The filter is used to minimize the gamma contribution in the beam, but it should be noted that it also affects the neutron flux (decreases the flux to approx. 13 ± 2% of the initial value) and its spectrum (shifting the mean neutron energy from 1.9 ± 0.1 MeV to about 1.3 ± 0.1 MeV [32]). For each of the investigated screens, five images with 120 s exposure time were acquired.…”

Section: Light Output Analysismentioning

confidence: 93%

“…The fission neutron spectrum with its mean energy at about 1.9 MeV is obtained by moving converter plates in front of the entrance window of the beam tube. Full energy spectrum of the beam available at NECTAR was presented elsewhere [32]. The plates consist of 2 slabs of highly enriched uranium (93% 235 U)-silicide with a total weight of 540 g. During reactor operation they act as a secondary neutron source.…”

Section: Methodsmentioning

confidence: 99%

“…The L/D collimation ratio used during the experiments was about 130, which is a measured value [32]. Additionally, to the 10 mm thick permanent Pb filter, different thicknesses of Pb in the range of 0-125 mm were used in the measurements of the gamma sensitivity of the investigated screens.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Makowska

Walfort²,

Zeller³

et al. 2017

J. Imaging

View full text Add to dashboard Cite

Abstract:Fast neutron imaging has a great potential as a nondestructive technique for testing large objects. The main factor limiting applications of this technique is detection technology, offering relatively poor spatial resolution of images and low detection efficiency, which results in very long exposure times. Therefore, research on development of scintillators for fast neutron imaging is of high importance. A comparison of the light output, gamma radiation sensitivity and spatial resolution of commercially available scintillator screens composed of PP/ZnS:Cu and PP/ZnS:Ag of different thicknesses are presented. The scintillators were provided by RC Tritec AG company and the test performed at the NECTAR facility located at the FRM II nuclear research reactor. It was shown that light output increases and the spatial resolution decreases with the scintillator thickness. Both compositions of the scintillating material provide similar light output, while the gamma sensitivity of PP/ZnS:Cu is significantly higher as compared to PP/ZnS:Ag-based scintillators. Moreover, we report which factors should be considered when choosing a scintillator and what are the limitations of the investigated types of scintillators.

show abstract

Section: Light Output Analysismentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Makowska

Walfort²,

Zeller³

et al. 2017

J. Imaging

View full text Add to dashboard Cite

show abstract

“…Bob-bond Mass attenuation coefficient for thermal and fast neutrons, compared to those for -rays of different energy [1,2]. Data are from NEA database [3] and are related to the non-bond cross section, which is appropriate for 2 MeV fission neutrons.…”

Section: Jdn 21mentioning

confidence: 99%

“…To overcome these limitations, the search for new solid state storage materials attracts a significant amount of attention. Among the JDN 21 2 5.6 39 [25] most attractive solutions are physisorption of H 2 molecules on porous, high surface area materials and chemisorption in non-classical hydrids. Neutrons with their privileged contrast for hydrogen or deuterium play a great role in elucidating atomic and molecular processes for physi-and chemisorption, but also shed light on the technological processes happening in operando when charging and unloading hydrogen tanks.…”

Section: How To Get the Hydrogen Into The Tankmentioning

confidence: 99%