Abstract
The geometrical parameters which affect the suppression factor for a T-shape HPGe-NaI(Tl) Compton suppression spectrometer are studied by a Monte Carlo simulation method. We simulate two combinations of this sort of Compton suppression spectrometer (113 and 146 cm 3 high-purity germanium detector is inserted into 22.9 cm Ø × 25.4 and 14.0 cm Ø × 17.8 cm annular NaI(Tl) shield detector, respectively). The simulation results of suppression factor are consistent with the results from the experiment. The optimal position of the HPGe detector within the shield is about at the half length of the radius of the NaI(Tl) detector for Compton suppression. Further simulation finds that the suppression factor is independent of the length of the shield but dependent on its radius. Other geometrical topologies for the shield are also discussed.
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