Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 40: Detectors 5 (scintillators)

T 40.8: Vortrag

Dienstag, 5. März 2024, 17:45–18:00, Geb. 30.23: 2/17

Simultaneous tomography with fast neutrons and gamma rays using the scintillator stilbene — •Nina Höflich, Glen Kiely, and Oliver Pooth — III. Physikalisches Institut B, RWTH Aachen University, 52074 Aachen

The neutron detectors group at the III. Physics Institute B, RWTH Aachen University, develops a multi-pixel detector for a compact fast neutron imaging setup. Imaging with fast neutrons in addition to X- or gamma ray imaging can provide complementary information about the object of interest.
The scintillator stilbene, cut into 16 cuboids arranged in a 4×4 array, is used for particle detection. The scintillation light is detected with 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. Tomographic measurements of simple test objects were performed, combining the measured fast neutron and gamma attenuation.
Additionally, a Geant4 simulation was developed enabling to simulate various configurations for imaging with fast neutrons and gammas. It allows to simulate tomographies with the current detector, but also various configurations (e.g. detector pixel sizes, arrangements, etc) for tomography with a future, larger detector.
In this talk, setup and results of both the tomographic measurements and the Geant4 simulation will be presented.

Keywords: Fast neutron imaging; Geant4; Scintillation detectors; Neutron detection