The Oriented Scintillation Spectrometer Experiment (OSSE) consists of four NaI scintillation detectors, sensitive to energies from 50 keV to 10 MeV. Each of these detectors can be individually pointed. This allows observations of a gamma-ray source to be alternated with observations of nearby background regions. An accurate subtraction of background contamination can then be made.
NASA Science Official: Neil Gehrels, of the Astrophysics Science Division at NASA/ GSFC.
The Oriented Scintillation Spectrometer Experiment (OSSE), url=<a rel="nofollow" class="external free" href="http://heasarc.gsfc.nasa.gov/docs/cgro/cgro/osse.html">http://heasarc.gsfc.nasa.gov/docs/cgro/cgro/osse.html</a>.