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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Postersession - Medical Physics

ST 2.3: Poster

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

Purification of the organo-metallic liquid TMBi for use in a novel PET detector — •Simon-Nis Peters¹, Konstantin Bolwin², Björn Gerke², Volker Hannen¹, Christian Huhmann¹, Klaus Schäfers², and Christian Weinheimer¹ — ¹Institut für Kern- physik, 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 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, charge readout using a segmented anode can provide an accurate position reconstruction. To be able to drift the charges to the anode a high level of purification of the liquid is required, removing any electro-negative contaminations. Due to the reactive nature of the liquid, purification using getter materials is not an option. In addition only vacuum grade ceramics and stainless steel components can be used for a purification system. The Poster will present the design of a purification bench combining a TMBi distillation column with molecular sieves and a prototype detector cell which will allow to determine the characteristics of charge readout in the liquid. This work is supported by the DFG (Project number: WE 1843/8-1; SCHA 1447/3-1)