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The Soft Gamma-ray Detector (SGD) is one of the instrument payloads onboardASTRO-H, and will cover a wide energy band (60--600 keV) at a background level10 times better than instruments currently in orbit. The SGD achieves lowbackground by combining a Compton camera scheme with a narrow field-of-viewactive shield. The Compton camera in the SGD is realized as a hybridsemiconductor detector system which consists of silicon and cadmium telluride(CdTe) sensors. The design of the SGD Compton camera has been finalized and thefinal prototype, which has the same configuration as the flight model, has beenfabricated for performance evaluation. The Compton camera has overalldimensions of 12 cm x 12 cm x 12 cm, consisting of 32 layers of Si pixelsensors and 8 layers of CdTe pixel sensors surrounded by 2 layers of CdTe pixelsensors. The detection efficiency of the Compton camera reaches about 15% and3% for 100 keV and 511 keV gamma rays, respectively. The pixel pitch of the Siand CdTe sensors is 3.2 mm, and the signals from all 13312 pixels are processedby 208 ASICs developed for the SGD. Good energy resolution is afforded bysemiconductor sensors and low noise ASICs, and the obtained energy resolutionswith the prototype Si and CdTe pixel sensors are 1.0--2.0 keV (FWHM) at 60 keVand 1.6--2.5 keV (FWHM) at 122 keV, respectively. This results in goodbackground rejection capability due to better constraints on Comptonkinematics. Compton camera energy resolutions achieved with the final prototypeare 6.3 keV (FWHM) at 356 keV and 10.5 keV (FWHM) at 662 keV, respectively,which satisfy the instrument requirements for the SGD Compton camera (betterthan 2%). Moreover, a low intrinsic background has been confirmed by thebackground measurement with the final prototype.

The Si/CdTe semiconductor Compton camera of the ASTRO-H Soft Gamma-ray Detector (SGD)