Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 68: Detector Systems 2

T 68.8: Vortrag

Mittwoch, 23. März 2022, 18:00–18:15, T-H27

Fast neutron and gamma tomography with a stilbene-based multi-pixel detector — •Nina Höflich and Oliver Pooth — RWTH Aachen University - Physics Institute III B, Aachen, Germany

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 × 6  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 as well as gamma rays of 4.44 MeV for our measurements.
The talk will focus on recent results from tomographic test measurements of simple objects. Strategies for image reconstruction and image processing will be presented. Additionally, possible improvements will be discussed, based on Geant4 simulation results.