加兴地下实验室的低水平γ射线能谱分析。
Low-level γ-ray spectrometry at the underground laboratory Garching.
作者信息
Sivers M v, Hofmann M, Mannel T, Feilitzsch F v, Oberauer L, Potzel W, Schönert S
机构信息
Physik-Department E15, Technische Universität München, 85748 Garching, Germany.
出版信息
Appl Radiat Isot. 2014 Sep;91:49-56. doi: 10.1016/j.apradiso.2014.05.010. Epub 2014 May 24.
Two low-background setups for material screening based on HPGe detectors were built in the Garching Underground Laboratory with an overburden of ~10 m.w.e. They include several layers of passive shielding as well as an active muon veto. The first setup (GEM) comprises a 150% efficiency HPGe detector which can optionally be surrounded by a NaI(Tl) scintillation detector that serves as anti-Compton veto. The second setup (LoAx) consists of two smaller HPGe detectors which are arranged face-to-face to cover a larger solid angle around the sample and to allow coincidence measurements. For a 5.6 kg piece of copper after 11 days of measurement we have reached a sensitivity for (226)Ra and (228)Ra/(228)Th of ~5 mBq kg(-1) with the GEM setup. In the LoAx setup we have achieved limits of less than 100 mBq kg(-1) for (234)Th and (210)Pb with a 156 g sample of PPO wavelength shifter after 18 days of measurement.
在盖兴地下实验室（覆盖层约为10米水当量）建造了两套基于高纯锗探测器的低本底材料筛选装置。它们包括几层被动屏蔽以及一个有源μ子 veto。第一套装置（GEM）包括一个效率为150%的高纯锗探测器，该探测器可选择性地被用作反康普顿 veto的碘化钠（铊）闪烁探测器包围。第二套装置（LoAx）由两个较小的高纯锗探测器组成，它们面对面排列，以覆盖样品周围更大的立体角并进行符合测量。使用GEM装置，对一块5.6千克的铜进行11天测量后，我们对（226）镭和（228）镭/（228）钍的灵敏度达到了约5毫贝克勒尔每千克（-1）。在LoAx装置中，对156克的PPO波长移位器样品进行18天测量后，我们对（234）钍和（210）铅的检测限达到了低于100毫贝克勒尔每千克（-1）。
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