Methods for achieving ultra-low backgrounds in above-ground germanium detector systems |
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Authors: | R. J. Arthur J. H. Reeves |
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Affiliation: | (1) Pacific Northwest Laboratory, 99352 Richland, Washington, (USA) |
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Abstract: | The authors have previously shown how to achieve a 40-fold reduction in system background for above-ground germanium detectors. Such systems are generally sufficient for examining small hydrogenous samples or samples of non-hydrogenous materials such as soil, glass, metals, etc. However, samples with a large hydrogen content yield a seriously degraded background due to a number of neutron-induced interactions, such as Compton scatter following hydrogen capture of thermalized neutrons. A study was performed to better understand the sources of thermal neutron flux in above-ground detector systems. The effects of different quantities of hydrogen in the sample were also examined. Methods are presented for additional lowering of system background for both hydrogenous and non-hydrogenous samples. |
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