Comparison of background in OSO-7 and SMM spectrometers and short-term activation in SMM

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Abstract
The backgrounds in the OSO‐7 Gamma‐Ray Monitor and the Solar Maximum Mission Gamma‐Ray Spectrometer are compared. After scaling to the same volume, the background spectra agree to within 30%. This shows that analyses which successfully describe the background in one detector can be applied to similar detectors of different sizes and on different platforms. The background produced in the SMM spectrometer by a single trapped‐radiation belt passage is also studied. This background is found to be dominated by a positron‐annihilation line and a continuum spectrum with a high energy cutoff at ∼5 MeV. The decay times of the major background components are determined and possible sources are discussed.

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