Journal
JOURNAL OF INSTRUMENTATION
Volume 17, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1748-0221/17/12/P12021
Keywords
Counting-gas and liquid purification; Gamma detectors (scintillators; CZT; HPGe; HgI etc); Liquid detectors
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG)
- French national research agency (ANR)
- [WE 1843/8-1]
- [SCHA 1447/3-1]
- [ANR-18-CE92-0012-01]
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In this paper, a new type of PET detector using TriMethyl Bismuth (TMBi) as target material is proposed. The experimental setup aims to remove impurities and characterize the properties of TMBi for its application as a detector medium. This study demonstrates the potential of TMBi in PET applications but also highlights the challenges to be addressed.
A new type of detector for positron-emission tomography (PET) has been proposed recently, using a heavy organo-metallic liquid - TriMethyl Bismuth (TMBi) - as target material. TMBi is a transparent liquid with the high Z element Bismuth contributing 82% of its mass. 511 keV annihilation photons are converted efficiently into photo-electrons within the detector material producing both Cherenkov light and free charge carriers in the liquid. While the optical component enables a fast timing, a charge readout using a segmented anode can provide an accurate position reconstruction and energy determination. The charge measurement requires a high level of purification, as any electronegative contaminants cause signal degradation. In addition to the purity requirements, the reactive nature of TMBi poses many challenges that need to be met until a fully functioning detector for PET applications can be realized. The paper presents an experimental setup that aims to remove electronegative impurities by electrostatic filtering and to characterise the properties of TMBi, e.g. the relative permittivity, for its application as a detector medium for charge read out.
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