Improvement in the spatial resolution for imaging with fast neutrons

We report on the realization of an improved concept for the detection of fast neutrons using a specific setup of scintillators with the aim to overcome limitations in spatial resolution. While fast neutron imaging (FNI) is a technique to investigate very thick material layers in transmission mode, c...

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Veröffentlicht in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2021-02, Vol.988, p.164809, Article 164809
Hauptverfasser: Lehmann, E.H., Mannes, D., Strobl, M., Walfort, B., Losko, A., Schillinger, B., Schulz, M., Vogel, S.C., Schaper, D.C., Gautier, D.C., Newmark, D.
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Sprache:eng
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Zusammenfassung:We report on the realization of an improved concept for the detection of fast neutrons using a specific setup of scintillators with the aim to overcome limitations in spatial resolution. While fast neutron imaging (FNI) is a technique to investigate very thick material layers in transmission mode, currently there is a limit in the spatial resolution at ∼1 mm, which hinders the performance for the detection of features like cracks, material damage or pores in large objects (≫1 cm3). The improved concept presented here is based on the separation of the converter material from the scintillation layer in a suitable way, which was successfully tested and referenced to the standard devices at the NECTAR facility (FRM-2, MLZ, Garching) under realistic beamline conditions. The results imply a break-through in enabling detection of structures on the order of 0.2 to 0.5 mm (a more precise estimation is not possible due to other resolution determining factors in a realistic setup). Potential additional improvements are discussed.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2020.164809