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Isotopically enriched germanium detectors for astrophysical gamma-ray spectroscopyA study is presented of the instrumental background in astrophysical gamma-ray spectrometers using isotopically enriched germanium detectors. Calculations show that the beta-decay background, which is the largest component between approximately 0.1 and 1.0 MeV in balloonborne and satellite spectrometers, is dominated by the activation of Ge-74. This component can be reduced by an order of magnitude using detectors enriched to more than 80 percent in (Ge-70). The predicted reduction in the total background for current balloonborne instruments is more than a factor of 1.7 between 0.2 and 1.0 MeV. For future satellite instruments, the reduction in this energy range is by more than a factor of 5.
Document ID
19920053251
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gehrels, Neil
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Nuclear Instruments and Methods in Physics Research, Section A - Accelerators, Spectrometers, Detectors, and Associated Equipment
Volume: 292
ISSN: 0168-9002
Subject Category
Instrumentation And Photography
Accession Number
92A35875
Distribution Limits
Public
Copyright
Other

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