Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.33: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Study of the spatial resolution of methods for photon interaction position determination in a monolithic scintillator — •A. Miani1,2, S. Liprandi1, S. Aldawood1,3, T. Marinšek1, L. Maier4, C. Lang1, H. van der Kolff1,5, R. Lutter1, R. Gernhäuser4, D. R. Schaart5, G. Dedes1, K. Parodi1, and P. G. Thirolf1 — 1LMU Munich, Germany — 2Università degli Studi di Milano, Italy — 3King Saud University, Riyadh, Saudi Arabia — 4TU Munich, Germany — 5Delft University of Technology, The Netherlands
At LMU Munich, a Compton camera prototype is being developed as a promising tool for ion-beam range verification for hadron therapy by detecting prompt γ rays induced by nuclear reactions between the particle beam and organic tissues.
The camera is composed of a scatterer, consisting of six layers of double-sided Si-strip detectors, and an absorber, a monolithic LaBr3:Ce crystal (50x50x30 mm3) read out by a 256-segments multianode PMT.
Key ingredient of the photon source reconstruction process is the determination of the γ ray interaction position in the monolithic scintillator. It has been determined by applying the k-Nearest Neighbor (k-NN) algorithm (van Dam et al., IEEE TNS 58 (2011)), which requires a large reference library of 2D scintillation light amplitude distributions, determined by scanning the scintillator with a 1 mm collimated 137Cs source and a fine step size (0.5mm). The characterization of the spatial resolution of the k-NN method will be presented.
This work was supported by the DFG Cluster of Excellence Munich Centre for Advanced Photonics (MAP) and KSU, Saudi Arabia.