Soft Gamma-ray Detector for the ASTRO-H mission

Hiroyasu Tajima*, Roger Blandford, Teruaki Enoto, Yasushi Fukazawa, Kirk Gilmore, Tuneyoshi Kamae, Jun Kataoka, Madoka Kawaharada, Motohide Kokubun, Philippe Laurent, Francois Lebrun, Olivier Limousin, Greg Madejski, Kazuo Makishima, Tsunefumi Mizuno, Kazuhiro Nakazawa, Masanori Ohno, Masayuki Ohta, Goro Sato, Rie SatoHiromitsu Takahashi, Tadayuki Takahashi, Takaaki Tanaka, Makoto Tashiro, Yukikatsu Terada, Yasunobu Uchiyama, Shin Watanabe, Kazutaka Yamaoka, Daisuke Yonetoku

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

57 Citations (Scopus)


ASTRO-H is the next generation JAXA X-ray satellite, intended to carry instruments with broad energy coverage and exquisite energy resolution. The Soft Gamma-ray Detector (SGD) is one of ASTRO-H instruments and will feature wide energy band (40-600 keV) at a background level 10 times better than the current instruments on orbit. SGD is complimentary to ASTRO-H's Hard X-ray Imager covering the energy range of 5-80 keV. The SGD achieves low background by combining a Compton camera scheme with a narrow field-of-view active shield where Compton kinematics is utilized to reject backgrounds. The Compton camera in the SGD is realized as a hybrid semiconductor detector system which consists of silicon and CdTe (cadmium telluride) sensors. Good energy resolution is afforded by semiconductor sensors, and it results in good background rejection capability due to better constraints on Compton kinematics. Utilization of Compton kinematics also makes the SGD sensitive to the gamma-ray polarization, opening up a new window to study properties of gamma-ray emission processes. The ASTRO-H mission is approved by ISAS/JAXA to proceed to a detailed design phase with an expected launch in 2014. In this paper, we present science drivers and concept of the SGD instrument followed by detailed description of the instrument and expected performance.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2010
Subtitle of host publicationUltraviolet to Gamma Ray
Publication statusPublished - 2010
EventSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
Duration: 2010 Jun 282010 Jul 2

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Country/TerritoryUnited States
CitySan Diego, CA


  • CdTe
  • Compton telescope
  • Gamma-ray
  • Polarimeter
  • Semiconductor detector
  • Silicon Detector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Soft Gamma-ray Detector for the ASTRO-H mission'. Together they form a unique fingerprint.

Cite this