The dead-layer uniformity of the top surface of two high purity germanium detectors has been studied using a novel automated scanning set-up that allows a fine-grained topography of a detector's top and lateral surfaces. Comparisons between measurements and Monte Carlo simulations allowed implementation of a dead-layer variation into the detector model, which reproduces the measurements results. The effect of the non-uniform dead-layer on activity determinations based on low-energy gamma-rays (i.e. below 100 key) has been determined to be of the order of 10% or more. (C) 2013 Elsevier Ltd. All rights reserved.
Determination of dead-layer variation in HPGe detectors
GARFAGNINI, ALBERTO;HEMMER, SABINE ELISABETH;VON STURM ZU VEHLINGEN, KATHARINA CACILIE
2014
Abstract
The dead-layer uniformity of the top surface of two high purity germanium detectors has been studied using a novel automated scanning set-up that allows a fine-grained topography of a detector's top and lateral surfaces. Comparisons between measurements and Monte Carlo simulations allowed implementation of a dead-layer variation into the detector model, which reproduces the measurements results. The effect of the non-uniform dead-layer on activity determinations based on low-energy gamma-rays (i.e. below 100 key) has been determined to be of the order of 10% or more. (C) 2013 Elsevier Ltd. All rights reserved.File in questo prodotto:
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