Multiwavelength Astronomy Multimedia


GRIS germanium detectors


GRIS consists of seven of the world's largest, high-purity, n-type germanium (Ge) detectors. The detectors are cooled to liquid nitrogen temperatures (in order to achieve high resolution) and are surrounded by a thick anti-coincidence shield which allows the rejection of background events from true astrophysical events.


  • Gamma-Ray Imaging Spectrometer (GRIS)
  • Detector
  • Instrument


NASA/GSFC; Image courtesy Neil Gehrels



Associated Lesson

Gamma Ray Tools

This material is based upon work supported by NASA under Grant Nos. NNX09AD33G and NNX10AE80G issued through the SMD ROSES 2009 Program.

Any opinions, findings, and conclusions or recommendations expressed in this website are those of the author(s) and do not necessarily
reflect the views of the National Aeronautics and Space Administration.