材料筛选用高灵敏度GERDA γ谱仪（二）
Highly Sensitive Gamma-Spectrometers of GERDA for Material Screening: Part 2
摘要：
上一篇关于GERDA材料筛选的文章指出了严格的材料筛选和放射性杂质选择的重要性，这是满足GERDA实验期望背景水平的关键。这是直接使用低水平伽马光谱学完成的。为了在mBq/kg及以下范围内提供足够的选择性功率，所采用的γ谱仪本身必须满足严格的材料要求，并使用精心设计的屏蔽系统。本文介绍了两台这样的光谱仪的安装情况。Corrado位于15 m w.e.的深度。在德国海德堡的MPI-K，GeMPI III位于西3500 m的Gran-Sasso地下实验室。（意大利）。后一个项目旨在探测约0.01 mBq/kg数量级的样品放射性，这是目前的最新水平。应用技术，以满足各自的需求进行了讨论和实验结果表明。
英文摘要：
The previous article about material screening for GERDA points out the importance of strict material screening and selection for radioimpurities as a key to meet the aspired background levels of the GERDA experiment. This is directly done using low-level gamma-spectroscopy. In order to provide sufficient selective power in the mBq/kg range and below, the employed gamma-spectrometers themselves have to meet strict material requirements, and make use of an elaborate shielding system. This article gives an account of the setup of two such spectrometers. Corrado is located in a depth of 15 m w.e. at the MPI-K in Heidelberg (Germany), GeMPI III is situated at the Gran-Sasso underground laboratory at 3500 m w.e. (Italy). The latter one aims at detecting sample activities of the order ~0.01 mBq/kg, which is the current state-of-the-art level. The applied techniques to meet the respective needs are discussed and demonstrated by experimental results.
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