Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 7: Instrumentation and Applications I

HK 7.8: Vortrag

Montag, 11. März 2002, 18:45–19:00, F

Tracking Detectors for Gamma-ray Imaging — •Lucian Mihailescu, Werner Gast, and Rainer Lieder — Forschungszentrum Jülich, IKP, Jülich

Gamma-ray imaging devices based on the Compton-camera principle could provide the highest detection efficiency, at least in theory, since they do not require any kind of collimation or masking. In reality, the large volume detectors needed for good efficiency, the high granularity needed for precise localization of the Compton interactions, and the high energy resolution needed for the reconstruction of the scattering angles made them incompetitive for practical implementation with respect to other approaches until now. With the advent of a new technical concept, the gamma-ray tracking detector, this situation may change. The tracking detector is a large volume high resolution semiconductor detector with relatively low granularity, but combined with advanced digital signal processing methods it is able to provide an effective position sensitivity being two orders of magnitude higher than that given by the physical granularity. The signal processing employs the WPC (Wavelet transform - Pattern recognition - Correlation) analysis which decomposes and extracts multiple interactions occuring in the detector by analyzing the features of the digitized detector segment signals. In this contribution we present the relevant criteria for a Compton-camera design based on tracking detector principles with planar Ge diodes.