Heidelberg 2022 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 6: Detectors and Applications I

ST 6.5: Talk

Wednesday, March 23, 2022, 12:00–12:15, ST-H4

Coincident Detection of Cherenkov Photons from Electrons for Medical Applications — •Kaveh Kooshk, Ivor Fleck, and Daniel Berker — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen

The need for medical imaging devices capable of detecting high energy photons prompts research into new detection methods such as Compton camera in nuclear medicine. A new detection method for Compton electrons using Cherenkov radiation is proposed in this work as a proof of principle. Electrons from beta minus decay of Strontium 90/Yttrium 90 with energies up to 2.28 MeV are used. They are directed through a vacuum channel within which an EM field from an electromagnet allows only a specific energy to reach a collimator at the end of the path. After the collimator, the energy spread of the electrons is less than 6% around the nominal energy which can vary between 0.5 and 2.28 MeV. The electrons subsequently reach a radiator material (PMMA) and produce Cherenkov photons, which are detected via a 8x8 Silicon-Photomultiplier array with 64 readout channels. For each electron, the Cherenkov photons are collected within a time-window of 100 ns. The spatial distribution of the Cherenkov photons and their total number are recorded and will be investigated as a function of electron energy, and the results will be compared with theoretical data.