Pulse Shape Analysis of a Segmented Planar Germanium Detector by Using the Green's Function Method and Rise-Time Correlations for Depth Information(Nuclear Physics)

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We performed pulse shape analysis to extract depth information for an interaction point of γ rays in a 25-fold segmented germanium detector. With a 90° Compton spectrometer with collimators on both incidence and exit sides, we measured pulse shapes for the two interaction points, (x, y, z) = (2.5cm, 2.5cm, 0.5cm) and (2.5cm, 2.5cm, 1.0cm). Experimental pulse shapes were compared with calculated ones by the three-dimensional Green's function method. Analytical solutions for induced charges on each cathode and an anode were obtained for a hole and an electron as a function of time It is suggested that a rise-time correlation between the anode and the central cathode signals, T_<90> (anode) - T_<50> (cathode), can be used as a useful means to determine the depth (z) of an interaction point given an in-plane position (x, y). It is shown that calculated rise-time correlations are in qualitative agreement with experimental ones obtained by uncollimated γ rays
社団法人日本物理学会の論文
2004-12-15