SMuK 2023 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 5: Physics and Technology for Radiation Detection

ST 5.2: Vortrag

Mittwoch, 22. März 2023, 16:05–16:20, ZEU/0146

Development of a Compton Camera with detection of electrons’ interaction point and energy in the scattering layer using Cherenkov photons — •Kaveh Kooshk¹, Reimund Bayerlein², Ivor Fleck¹, Ulrich Werthenbach¹, and Michael Ziolkowski¹ — ¹Universität Siegen, NRW, DE — ²University of California Davis, CA, US

A Compton Camera can be a great real-time imaging asset for Proton Beam Therapy cancer treatment and radio-immunotherapy. The main goal is imaging of gammas above 0.5 MeV, which cannot otherwise be resolved by conventional detectors such as SPECT with good efficiency. To that end, we designed an experimental setup which reconstructs Compton electron’s energy and direction using coincident detection of Cherenkov photons. In order to calibrate the energy estimation, we built a device which separates electrons with energies up to 2.28 MeV from a 90Sr/90Y source to a very small spectrum using a magnetic field. The electrons subsequently undergo Cherenkov effect in a PMMA radiator, in contact with a 8x8 SiPM array with 3x3mm² sized read-out channels. A separation resolution of 10 to 20% has been achieved for 7 different energy beams from 0.8 MeV to 2 MeV. The number of Cherenkov photons, detected in coincidence from SiPm’s time-over-threshold signal within a time-window of 10 ns, is used to estimate the electron energy. The results are compared with a mean value available from theory.