München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Instrumentation XI, Accelerators and Applications

HK 52.5: Vortrag

Donnerstag, 21. März 2019, 15:15–15:30, HS 11

Characterization of organo-metallic liquids for a novel PET detector — •Simon Peters¹, Konstantin Bolwin², Björn Gerke², Volker Hannen¹, Christian Huhmann¹, Klaus Schäfers², and Christian Weinheimer¹ — ¹Institut für Kernphysik, WWU Münster — ²European Institute for Molecular Imaging, WWU Münster

Recently, a new type of PET detector has been proposed using a heavy organo-metallic liquid - TriMethyl Bismuth (TMBi) - as target material. TMBi is a transparent liquid with 82% by weight of Bismuth as the heaviest non-radioactive element. 511 keV photons from annihilation processes are effectively converted to photo-electrons in the material due to the high Z bismuth component. These photo-electrons produce both Cherenkov light and charges in the liquid. While the optical component enables a fast timing, a charge readout using a segmented anode can provide an accurate position reconstruction.
The charge measurement requires a high level of purification of the liquid to remove any electro-negative contaminations. In addition, as charge multiplication in the liquid is not an option, the readout of the pulses requires extremely low noise electronics. To be able to compare to existing results from literature, first test measurements were performed using Tetra-Methyl-Si as detection medium. The talk will present the setup of a test bench for purification and current / pulse detection and thereby characterization of the organo-metallic liquid under study. This work is supported by DFG via the Cells-in-Motion Cluster of Excellence.