Abstract
A Compton imaging telescope has been constructed using a 0.2cm thick Silicon (Si) detector of active area 9.0×9.0cm2 and a pixelated Cadmium Zinc Telluride (CZT) detector of dimensions 2.0×2.0×0.5cm3. The Si detector is double sided with 64 strips per side in two orthogonal directions. The CZT detector has 64pixels of pitch 0.25cm. We used several ASICs (32 channel) to read out both detectors. A 137Cs source was used in the study. The energy deposited in the Si and CZT detectors and the points of interaction of the γ-ray in both detectors were read out. We varied the position of the source as well as the vertical separation between the Si and CZT detectors and measured the angular resolution of the source image for the different configurations. The best angular resolution (1σ) was 2.4°. Monte Carlo simulations were run for similar detector configurations and agree with the experimental results.
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