| 摘要 |
PURPOSE: To detect specific high-energy gamma rays by providing a non- defective single crystal with an entrance surface and a transmission surface at the opposite end and a gamma ray detection means that is arranged so that rays enter the input surface of a crystal at a specific Bragg angle. CONSTITUTION: A telescope 10 has a non-defective single crystal 12 made of, for example, silicon, and one end face and the other end face of the single crystal 12 constitute an input surface 14 and a transmission surface 18, respectively. The crystal 12 is surrounded by a gamma active shield 24 that is used as an anticoincidence counter that is made of, for example, sodium iodide. A gamma ray detector 20 is arranged close to the transmission surface 18. With this configuration, the telescope 10 is in the direction of a Bragg angle ξfor a specific wavelength related to the telescope 10. Detected gamma rays are counted, the telescope 10 is rotated at a different angle ξ for gamma rays with a different wavelength, and gamma rays are detected again. A data processing system 32 is connected to the detector 20 for counting gamma rays. |
