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The use of an active coded aperture for improved directional measurements in high energy γ-ray astronomy

The coded aperture, a refinement of the scatter-hole camera, offers a method for the improved measurement of γ-ray direction in γ-ray astronomy. Two prototype coded apertures have been built and tested. The more recent of these has 128 active elements of the heavy scintillator BGO. Results of tests for γ-rays in the range 50 - 500 MeV are reported and future application in space discussed.