ULTRALOW BACKGROUND GERMANIUM GAMMA-RAY SPECTROMETER.

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作者
Brodzinski, Ronald [1 ]
Brown, Donald P. [1 ]
Evans Jr., John C. [1 ]
Hensley, Walter K. [1 ]
Reeves, James H. [1 ]
Wogman, Ned A. [1 ]
Avignone III, Frank T. [1 ]
Miley, Harry S. [1 ]
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[1] Pacific Northwest Lab, Richland, WA,, USA, Pacific Northwest Lab, Richland, WA, USA
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There are many applications for a gamma-ray detector which has a background more than two orders of magnitude lower than a standard; low background; intrinsic-Ge; Compton-suppressed spectrometer; including the study of neutrinoless and two-neutrino double beta decay. This paper describes a series of experiments performed to develop an ultralow background detector with a 135 cm' intrinsic Ge diode in three different environments . The baseline experiment involved a typical low level counting facility . Sources of background were identified; and a baseline background was measured as a function of energy . An extensive program; carried out over several years; identified clean sources of material and evaluated their radiopurity. A cooperative program between the Pacific Northwest Laboratory (PNL); the University of South Carolina (USC); and Princeton Gamma Tech; Inc. (PGT) was developed; and a new cryostat was built from materials identified from the radiopurity measurements. The detector was then tested above ground in a combination bulk and partial cosmic-ray anticoincidence shield . The detector was then moved to a site in the Homestake gold mine in Lead; South Dakota; where 1438 m of rock overburden provided a water-equivalent thickness for cosmic ray at- * This work was supported by the US Department of Energy under Contract No . DE-AC06-76RLO 1830 and the Na-tional Science Foundation under Grant No . PHY-ß2o9562;
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页码:207 / 213
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