Regensburg 2019 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 4: Poster session
ST 4.5: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Performance of a monolithic scintillator studied under realistic conditions in a Compton Camera system — •Giovanni Paolo Vinci, Tim Binder, Silvia Liprandi, Maria Kawula, Katia Parodi, and Peter G. Thirolf — Ludwig-Maximilans-Universität München
The Compton Camera (CC) prototype under commissioning in Garching aims at providing an online beam range verification tool using the prompt γ rays emitted by excited nuclei during the irradiation of tissue with a particle beam. Currently, we are working with 50x50x30 mm3 monolithic LaBr3:Ce or CeBr3 scintillators as CC absorber component, read out by multianode photomultipliers. These configurations show excellent energy, spatial and timing resolutions.
In realistic conditions, however, the Compton electrons, generated in the scatterer, consisting of 6 layers of 0.5 mm thick double-sided Silicon strip detectors (DSSSD), may reach the scintillator, since the thickness of the DSSSD array is not enough to stop them. So far, the determination of the photon interaction position in the absorber crystal was studied only with individual collimated γ sources. Yet, it remains to be explored how the resolution is affected by either an electron and the Compton scattered photon or two photons impinging simultaneously onto the crystal. This work will present a study of these two scenarios using simultaneous irradiation by a collimated 204Tl electron source and collimated 137Cs or 60Co photon sources.
This work is supported by the DFG Cluster of Excellence Munich Centre for Advanced Photonics (MAP).