SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 97: Calorimeter / Detector Systems IV

T 97.6: Vortrag

Mittwoch, 22. März 2023, 18:45–19:00, WIL/C133

Simultaneous fast neutron and gamma tomography with a stilbene-based multi-pixel detector — Aenne Abel, •Nina Höflich, and Oliver Pooth — III. Physikalisches Institut B, RWTH Aachen University

The neutron detectors group at the Physics Institute III B, RWTH Aachen University, develops a multi-pixel detector for a compact fast neutron imaging setup. Since the interactions of fast neutrons in matter differ from those of X-rays and gamma rays, imaging with fast neutrons in addition to X- or gamma ray imaging can provide complementary information about the object of interest.
Our current detector prototype uses cuboids of the organic scintillator stilbene as active material, coupled to a SiPM array. The pixel size is 6.2 × 6.2 mm² . The usage of stilbene allows to distinguish neutron- and gamma-induced signals in the detector. An Americium-Beryllium neutron source delivers fast neutrons of up to 11 MeV and gamma rays of 4.44 MeV for our measurements.
In this talk, tomographic measurements of different test objects will be discussed, combining information from neutron and gamma attenuation. The main focus will be on the spatial resolution and the material distinction capability of our setup. Furthermore, possible improvements of our setup and the tomographic reconstructions will be briefly discussed.