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Project:   Fermi Gamma-ray Burst Monitor (GBM)

  
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The GBM detector system consists of twelve single NaI detectors mounted in bunches of three detectors on each corner of the Fermi satellite and of two BGO detectors mounted on opposite sides of the spacecraft.

The energy range covered by the NaI detectors is 10 keV to 1 MeV, and the range of the BGO is 150 keV to ∼30 MeV.

NaI detector
NaI detector 		BGO detector
BGO detekcor
The central crystal, wraped in black, is viewed by two Photomultipliers (golden color)
 
location of GBM on Fermi
Location of the GBM detectors on the
Fermi structure. 		GBM on Fermi
GBM mounted on Fermi
(similar view as the drawing left; image: Ben Cooper)

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