Abstract
Suppression systems reduce Compton backscattering counts in a gamma ray spectrum. Every system has particular calibration nuances due to differences in electronics, detectors and environment. This study examines several Compton suppression systems at the NIST Center for Neutron Research in an effort to produce a general guide to their setup and use rather than determine specific settings for a certain experiment. Troubleshooting procedures for timing and calibration of these systems were also examined.A central high purity germanium (HPGe) detector is surrounded by guard detectors. Counts picked up by both detectors are Compton or escape events, while those detected only by the HPGe are photopeaks considered useful for analysis. The electronics system accepts counts detected only by the HPGe detector and rejects ones in coincidence with the guard detectors. Analysis of calibrated Cs-137, Na-24 and Co-60 sources demonstrated the effective Compton suppression for the systems. Examination of certified reference materials, activated in the reactor, demonstrated the experimental readiness of the systems.
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