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Astro-H is the sixth Japanese X-ray space observatory which will be launched in 2014. Two of onboard instruments of Astro-H, Hard X-ray Imager and Soft Gamma-ray Detector are surrounded by many number of large Bismuth Germanate (Bi 4 Ge 3 O 12 ; BGO) scintillators. Optimum readout system of scintillation lights from these BGOs are essential to reduce the background signals...
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