Hard X-ray and gamma-ray detector for ASTRO-H based on Si and CdTe imaging sensors

M. Kokubun*, S. Watanabe, K. Nakazawa, H. Tajima, Y. Fukazawa, T. Takahashi, J. Kataoka, T. Kamae, H. Katagiri, G. M. Madejski, K. Makishima, T. Mizuno, M. Ohno, R. Sato, H. Takahashi, T. Tanaka, M. Tashiro, Y. Terada, K. Yamaoka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We have been developing a hard X-ray imager and soft gamma-ray detector as on board instruments of the ASTRO-H mission. The Hard X-ray Imager (HXI) is one of the three focal plane detectors of ASTRO-H, which is aimed to realize the focusing imaging of hard X-ray photons in combination with hard X-ray telescopes. By use of the hybrid structure composed of double-sided silicon strip detectors and a cadmium telluride strip detector, it fully covers the energy range up to 80 keV with a high quantum efficiency. High spatial resolutions of 250μm pitch and energy resolutions of 12 keV (FWMH) are at the same time achieved with low noise front-end ASICs. The Soft Gamma-ray Detector (SGD) is a novel and unique detector which is characterized by semiconductor Compton cameras surrounded by narrow field-of-view active shields, and covers a higher energy range (30600 keV) than that of HXI. It consists of four Compton Cameras constructed with many layers of Silicon and CdTe pad detectors. With its multi-layer structure and Compton reconstruction capability, in addition to the BGO active shields read by Avalanche photo-diodes, this detector will achieve an extremely high background rejection efficiency in the orbit. We report the current status of hardware development including the design requirement, expected performance, and technical readinesses of key technologies.

Original languageEnglish
Pages (from-to)425-427
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2010 Nov 1


  • ASTRO-H mission
  • Semiconductor detector
  • X-ray/γray astrophysics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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