Abstract
Computer simulations using GEANT 3.21 with shields of various parameters are performed to investigate how shield parameters can influence the cosmic-muon induced background of a typical low-level HPGe γ-spectrometric system. It was found that the background increases with increasing inner shield dimensions to reach a saturated value for very large dimensions when the composition of the shield (bulk material, thickness, lining and proportion between height and width) is not changed. The background for a large shield is almost twice that for a tight one. The background does not depend significantly on the position of the detector inside a shield and on the shape (cylinder or rectangular) provided the inner dimensions are the same. There is a strong dependence on bulk material and lining. Backgrounds are lower below ≈500 keV but higher above ≈500 keV and in the 511 keV annihilation peak for higher- Z materials. Several types of lining are simulated and compared. Best results are obtained for a lead shield lined with 2 mm of tin.
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