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Comparison of background in underground HPGe-detectors in different lead shield configurations

In underground HPGe-detector systems where the cosmic ray induced background is low, it is often difficult to assess the location of background sources. In this study, background counting rate of different HPGe-detectors in different lead shields is reported with he aim of better understanding background sources. To further enhance the understanding of the variations of environmental parameters, the background as a function of time over a long period was also studied.