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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Postersession - Medical Physics

ST 2.4: Poster

Dienstag, 31. März 2020, 17:00–18:00, Grotte

Design of a detector cell for charge-readout tests in TMBi — •N. Marquardt¹, K. Bolwin², B. Gerke², V. Hannen¹, C. Huhmann¹, S. Peters¹, K. Schäfers², and C. Weinheimer¹ — ¹Institut für Kernphysik, WWU Münster — ²European Institute for Molecular Imaging, WWU Münster

The heavy organo-metallic liquid TriMethyl Bismuth (TMBi) has been proposed as a medium for a new type of PET detector. TMBi is a transparent liquid with a Bismuth mass fraction of 82%. Due to the high Z component of Bismuth, the 511 keV photons produced in annihilation processes are effectively converted to photo-electrons in the liquid. These photo-electrons produce both Cherenkov light and charge carriers in the TMBi. The detection of the Cherenkov light allows a fast timing, whereas charge-readout using a segmented anode provides an accurate position reconstruction.

Detection of the charge signals requires extremely low noise electronics and a highly purified liquid devoid of any electro-negative components to be able to drift electrons in the liquid. The electrical properties of TMBi relevant for this measurement have barely been studied up to now. Therefore, a small volume detector for charge-readout tests was build to study the TMBi characteristics under high voltage. The poster will present the design and setup of the detector cell and provide preliminary results of the measurements.

This work is supported by the DFG (Project number: WE 1843/8-1; SCHA 1447/3-1) and via the Cells-in-Motion Cluster of Excellence under project number 406703021.