Bonn 2020 – scientific programme
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ST: Fachverband Strahlen- und Medizinphysik
ST 7: Radiation Therapy and Detector Physics
ST 7.5: Talk
Thursday, April 2, 2020, 15:00–15:15, H-HS II
Energy Resolution of a Compton Camera Absorber Detector with SiPM Readout for up to 6.13 MeV — •Tim Binder1,2, Katia Parodi1, Florian Schneider2, and Peter G. Thirolf1 — 1Ludwig-Maximilians Universität, Munich, Germany — 2KETEK GmbH, Munich, Germany
The capability of spatially resolved γ detection is required in many applications in modern physics. A Compton camera (CC) allows to spatially resolve the γ-ray origin while still providing an acceptable efficiency compared to other detection setups. In medical physics a CC can be used to detect prompt γrays to verify the range of a hadron beam in the body during a patient’s tumor treatment or to detect a higher energetic γ (∼1.5 MeV) which is coincidently emitted by a β+ emitter (e.g. 44Sr) in a so-called Gamma-PET scanner. The γ origin is obtained, by using the kinematics of Compton scattering, where the energy and interaction position of the primary and the scattered γ is of major interest. Consequently, the energy resolution of the CC, consisting of a scatter and an absorber detector, is a key parameter.In this work, the energy resolution over a wide energy range (100 - 6130 keV) of a monolithic (50 x 50 x 30 mm3) LaBr3:Ce and a CeBr3 scintillator, respectively, with KETEK SiPM array readout and the PETsys TOFPET2 ASIC data acquisition system will be presented. Furthermore, a comparison study between SiPM with 25 µm and 50 µm microcell sizes will be shown and compared to a PMT readout. This work was supported by the DFG Cluster of Excellence MAP (Munich-Centre for Advanced Photonics) and the Bayerische Forschungsstiftung.