Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.50: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Characterization of Compton camera LaBr₃ absorber detector — •T. Marinsek¹, S. Aldawood^1,2, S. Liprandi¹, J. Bortfeldt¹, L. Maier³, C. Lang¹, H. van der Kolff^1,4, I. Castelhano^1,5, R. Lutter¹, G. Dedes¹, R. Gernhäuser³, D. R. Schaart⁴, K. Parodi¹, and P. G. Thirolf¹ — ¹LMU Munich, Garching, Germany — ²King Saud University, Riyadh, Saudi Arabia — ³TU Munich, Garching, Germany — ⁴TU Delft, The Netherlands — ⁵University of Lisbon, Lisbon, Portugal

Detection of prompt γ rays from nuclear interactions between a particle beam and organic tissue using a Compton camera to determine the Bragg peak position is a promising way of ion-beam range verification in hadron therapy. The Compton camera consists of a stack of six double-sided Si-strip detectors acting as scatterers, while the other essential part - the absorber - is made of a LaBr₃ monolithic scintillator crystal (50×50×30 mm³) with reflective side-surface wrapping, offering excellent time and energy resolution. Scintillation light induced in the crystal is detected by a 256-fold segmented multi-anode PMT. Prerequisite to reconstruct the γ source position is the determination of the photon interaction position in the crystal by applying "k-nearest neighbors" algorithm (van Dam et al., Nuclear Science (2011)) using the reference library of light distributions, obtained by performing a 2D scan of the detector using a strong collimated ¹³⁷Cs source. The status of the spatial resolution characterization will be presented.
^∗ Supported by the DFG Cluster of Excellence, MAP (Munich-centre for Advanced Photonics).