Ionization parameters of Trimethylbismuth for high-energy photon detection

Autor: Klaus P. Schäfers, Ch. Weinheimer, G. Tauzin, D. Yvon, V. Sharyy, J.-P. Bard, J. P. Mols, M. Farradèche, J-P. Dognon
Přispěvatelé: Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Structure et Dynamique par Résonance Magnétique (LCF) (LSDRM), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut für Kernphysik, Westfälische Wilhelms-Universität Münster = University of Münster (WWU), European Institute for Molecular Imaging (EIMI), ANR-18-CE92-0012,BOLD-PET,Détecteur Bismuth-Organique Mixte, Optique Tcherenkov et Chambre Ionisation, pour la Tomographie par Emission de Positrons(2018), Palacin, Serge, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Département de Physique des Particules (ex SPP) (DPP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Physique des Particules (ex SPP) (DPhP), HEP, INSPIRE
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Nuclear and High Energy Physics
Photon
Physics - Instrumentation and Detectors
FOS: Physical sciences
Electron
01 natural sciences
030218 nuclear medicine & medical imaging
03 medical and health sciences
0302 clinical medicine
Electric field
Ionization
0103 physical sciences
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Instrumentation
Cherenkov radiation
Physics
[CHIM.MATE] Chemical Sciences/Material chemistry
Time projection chamber
010308 nuclear & particles physics
Detector
Instrumentation and Detectors (physics.ins-det)
[CHIM.MATE]Chemical Sciences/Material chemistry
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
[PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Ionization chamber
Atomic physics
Zdroj: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2020, 958, pp.162646. ⟨10.1016/j.nima.2019.162646⟩
15th Vienna Conference on Instrumentation
15th Vienna Conference on Instrumentation, Feb 2019, Vienna, Austria
HAL
ISSN: 0168-9002
1872-9576
DOI: 10.1016/j.nima.2019.162646⟩
Popis: CaLIPSO is an innovative photon detector concept designed for high precision brain PET imaging. For the first time, liquid trimethylbismuth is used as sensitive medium. The detector operates as a time-projection chamber and detects both Cherenkov light and charge signal. Indeed, each 511-keV photon releases a single primary electron that triggers a Cherenkov radiation and ionizes the medium. As trimethylbismuth has never been studied before, we measured its free ion yield defined as the number of electron-ion pairs released by the primary electron. To this end, we developed a low-noise measuring system to determine the weak current induced by a 60Co source in the liquid with an accuracy better than 5 fA for an electric field up to 7kV/cm. We used tetramethylsilane as benchmark liquid to validate the apparatus and we measured a zero-field free ion yield of 0.53 +/- 0.03 in agreement with literature. However, we found a zero-field free ion yield of 0.083 +/- 0.003 for trimethylbismuth, which is a factor 7 lower than the typical values for similar dielectric liquids. Quantum chemistry computations on heavy atoms tend to demonstrate the high ability of trimethylbismuth to capture electrons, which could explain this weak value. This recombination mechanism marks a new step in understanding charge transport in liquid detectors. Finally, to verify the detectability of individual charge pulses, we developed a charge pulse measurement system which has been successfully validated with TMSi. Measurements with TMBi are ongoing.
15th Vienna Conference on Instrumentation (2019)
Databáze: OpenAIRE
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