Erlangen 2026 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 3: Detectors for Medical Applications

ST 3.3: Vortrag

Mittwoch, 18. März 2026, 14:15–14:30, KH 01.013

SiPM Characterisation for the Construction of a Compton Camera Prototype — Atharva Bahekar, Yazeed Balasmeh, Ivor Fleck, Mara Fries, Lars Maczey, and •Devanshi Mehta — Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen

The development of a next-generation Compton camera capable of operating beyond the current energy limitations of conventional nuclear medical imaging requires highly efficient and low-noise gamma detectors. As part of the ongoing Compton camera project at the University of Siegen, this work focuses on the characterization of UV-sensitive Silicon Photomultipliers (SiPMs), which will form a key component of the detector system. In this work, I will present the characterization of Hamamatsu SiPMs compared to Broadcom, focusing on noise behaviour, breakdown characteristics and photon detection efficiency. Staircase measurements were performed to study breakdown behaviour and noise characteristics. Furthermore, I will present the dependence of noise on bias voltage and temperature, including the integration of a cooling system to improve stability. Alongside UV tests, we are checking how the SiPMs perform with scintillators such as GAGG and LGSO, focusing on PDE in the visible range.

Keywords: Compton Camera; Medical Imaging; SiPMs; Scintillators; Cherenkov light detection