Neutron measurements with Time-Resolved Event-Counting Optical Radiation (TRECOR) detector

Brandis, Michal; Vartsky, D.; Dangendorf, V.; Bromberger, B.; Bar, Doron; Goldberg, M.B.; Tittelmeier, K.; Friedman, E.; Czasch, A.; Mardor, I.; Mor, I.; Weierganz, M.

doi:10.1088/1748-0221/7/04/c04003

Cited by 16 publications

(12 citation statements)

References 8 publications

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“…Consequently, different materials must be used for converting fission neutrons in visible light. Different types of scintillators for fast neutrons are investigated and proposed in the literature, e.g., plastic fiber screens used in [24,25], wavelength-shifting fiber (WSF) converters [26,27] and others [28]. This work focuses on the results of a characterization of different screens based on polypropylene (PP) mixed with zinc sulfide (ZnS) phosphor rather than on alternative detection systems [20,22].…”

Section: Introductionmentioning

confidence: 99%

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

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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.

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Section: Introductionmentioning

confidence: 99%

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

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“…Therefore, the detected events can be attributed to a certain neutron or γ energy (with some ambiguity due to the low-energy fraction of the 15.1 MeV Compton background in the range of the 4.4 MeV line). A more detailed discussion of these results can be found in this proceedings by M. Brandis et al [12].…”

Section: Tests Of the Fndder Detection Systemmentioning

confidence: 86%

“…Figure 2: shows a schematic view of the detector. An updated and more detailed presentation of the detection system can be found in this proceedings [12].…”

Section: Detector System For Fast Neutron Dual Discrete Energy γ-Radi...mentioning

confidence: 99%

“…In the projected FNDDER method for ACCIS the sample will be illuminated simultaneously by a fast broad-energy neutron beam probing the transmission at various neutron cross-section resonances (revealing the detailed composition of low-Z materials) and by γ-rays of two discrete, well separated energies (4.4 and 15.1 MeV) for high-contrast radiography in the high-Z range. The pulsed broad-energy neutron beam and the dual discrete-energy γ-ray beam are produced in a 11 B target by a pulsed deuteron beam in the same nuclear reaction 11 B(d,n+γ) 12 C. The neutrons can easily be separated from the γ-component by the TOF method, the same technique used to measure the neutron energies. So far the events in the "Gamma peak" have been rejected in the data analysis as "background" and only the neutron events were analyzed for producing element-sensitive images as in Figure 1: .…”

Section: Tests Of the Fndder Detection Systemmentioning

confidence: 99%

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Time and position sensitive single photon detector for scintillator read-out

Schößler¹,

Bromberger²,

Brandis³

et al. 2012

J. Inst.

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We have developed a photon counting detector system for combined neutron and γ radiography which can determine position, time and intensity of a secondary photon flash created by a high-energy particle or photon within a scintillator screen. The system is based on a micro-channel plate photomultiplier concept utilizing image charge coupling to a position-and time-sensitive read-out anode placed outside the vacuum tube in air, aided by a standard photomultiplier and very fast pulse-height analyzing electronics. Due to the low dead time of all system components it can cope with the high throughput demands of a proposed combined fast neutron and dual discrete energy γ radiography method (FNDDER). We show tests with different types of delay-line read-out anodes and present a novel pulse-height-to-time converter circuit with its potential to discriminate γ energies for the projected FNDDER devices for an automated cargo container inspection system (ACCIS).

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“…Neutron conversion is achieved with a Fiber Optical Scintillator screen (FOS) made of plastic fi bers of 50 mm length and 0.7 mm in diameter. For obtaining time resolution of the order of ns, two different concepts are realized in the "Time Resolved Integrating Optical Imaging Neutron detector (TRION) [18] and the "Time Resolved Event Counting Optical Neutron detector (TRECOR) [19]. TRION collects simultaneously image frames at up to 8 different energies within a pulsed broad energy spectrum by a segmented ns gateable image intensifi er.…”

Section: Fast Neutron Imaging Detectorsmentioning

confidence: 99%