Physics – Atomic Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1159..287f&link_type=abstract
IN: EUV, X-ray, and gamma-ray instrumentation for astronomy and atomic physics; Proceedings of the Meeting, San Diego, CA, Aug.
Physics
Atomic Physics
1
Background Noise, Gamma Ray Spectrometers, Noise Reduction, Pulse Duration, Signal Detectors, Balloon-Borne Instruments, Cosmic Rays, Photosensitivity, Radioactive Decay
Scientific paper
A pulse-shape discrimination (PSD) technique is developed to reject the beta-decay background resulting from activation of Ge gamma-ray detectors by cosmic-ray secondaries. These beta decays are a major source of background at 0.2-2 MeV energies in well shielded Ge detector systems. The technique exploits the difference between the detected current pulse shapes of single- and multiple-site energy depositions within the detector: beta decays are primarily single-site events, while photons at these energies typically Compton scatter before being photoelectrically absorbed to produce multiple-site events. Depending upon the amount of background due to sources other than beta decay, PSD can more than double the detector sensitivity.
Campbell Randall D.
Feffer Paul T.
Lin Robert P.
Primbsch Henry J.
Smith Masson D.
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