| 摘要 |
GAMMA RAY DETECTING DEVICE USING CRYSTAL WAVEGUIDES A .gamma.-ray telescope that comprises a dislocation-free single crystal. Typical crystals include silicon and germanium, for example. The crystal is surrounded by an active shield that functions as an anticoincidence counter and a .gamma.-ray detector is disposed adjacent the crystal in order to detect received .gamma.-rays. The .gamma.-ray detector comprises an imaging proportional counter, scintillation counter, or a .gamma.-ray detecting charge coupled device, for example. The .gamma.-ray detector is based on the Borrmann effect, which is the anomalous transmission of .gamma.-rays through dislocation free single crystals at the Bragg angle. For extended sources, data processing is provided to separate the directional and wavelength dependence of the intensity variation. The .gamma.-ray telescope has angular resolution of at least one arc second and may have an effective aperture of several square meters. Reduction in background radiation, which is es-sentially determined by the crystal thickness, may be made quite large, greater than 1012. Consequently, the use of the present invention makes it possible to detect a weak .gamma.-ray source even in the presence of a large isotropic background.
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