GRIS background reduction results using isotopically enriched Ge
GRIS background reduction results using isotopically enriched Ge
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使用同位素富集 Ge 降低 GRIS 背景的结果
DOI：
10.1063/1.44149
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
H. Klapdor
中科院分区：
文献类型：
--
作者：
S. Barthelmy;L. Bartlett;N. Gehrels;M. Leventhal;B. Teegarden;J. Tuller;S. Belyaev;V. Lebedev;H. Klapdor
伽马射线成像光谱仪（GRIS）于1992年春季从澳大利亚爱丽斯泉起飞两次，在浮子高度共飞行了32小时。7个Ge探测器中的一个（Ge‐Lite）同位素富集（≥97% 70Ge）。这是第一次将富集锗探测器用于天体物理观测。由于具有较厚的反符合屏蔽层，GRIS仪器背景在200-1000 keV的能量范围内主要是内部β衰变。在这个β衰变“驼峰”中，有一半的贡献是由于中子激活的74Ge。GRIS观察到，在浓缩的探测器中，这种能量状态降低了两倍。在未来的仪器（INTEGRAL/NAE）中，具有更厚的反符合屏蔽和更小的孔径，背景减少将会更大。三个强大的乐器背景线（54,67和139 keV）也被消除。消除前两个对回旋加速器线观测特别重要。
The Gamma Ray Imaging Spectrometer (GRIS) was flown twice from Alice Springs, Australia in the spring of 1992 for a total of 32 hours at float alititude. One of the seven Ge detectors (Ge‐Lite) was isotopically enriched (≳97% 70Ge). This is the first time an enriched Ge detector has been used for astrophysical observations. Because of its thick anticoincidence shield, the GRIS instrument background is dominated by internal β‐decay in the energy range 200–1000 keV. Half of the contribution in this β‐decay ‘‘hump’’ is due to neutron activated 74Ge. GRIS observed a factor of two reduction in this energy regime in the enriched detector. In future instruments (INTEGRAL/NAE) with thicker anticoincidence shields and smaller apertures, the background reduction will be even larger. Three strong instrumental background lines (54, 67, and 139 keV) are also eliminated. The elimination of the first two is particularly important for cyclotron line observations.