Abstract
A Compton-suppression spectrometer, consisting of a pure Ge detector and BGO shield detectors is described. A cylindrical symmetry type of the shield detector configuration, with the Ge detector inserted on the symmetry axis, has been designed. The Compton-suppression factor is 6.0 for the photopeak of 60Co at 1332.5 keV. The peak-to-Compton ratio for the peak is 42 : 1 when the BGO detectors are used as a passive shield only, and is 250 : 1 in the suppression mode. Photon activation analysis with this detector has been made for the determination of trace elements in a bulk dysprosium sample. The signal-to-noise ratio for detecting trace elements in the sample has been improved by a factor from 1.3 to 3.1 by Compton suppression compared with that obtained in the non-suppression mode.
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