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Gamma-ray spectrometry of LDEF samples at SRL [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
15 pages : digital, PDF file
Additional Creators:
Westinghouse Savannah River Company, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A total of 31 samples from the Long Duration Exposure Facility (LDEF), including materials of aluminum, vanadium, and steel trunnions were analyzed by ultra-low-level gamma spectroscopy. The study quantified particle induced activations of ²²Na, ⁴⁶Sc, ⁵¹Cr, ⁵⁴Mn, ⁵⁶Co, ⁵⁷Co, ⁵⁸Co, and ⁶°Co. The samples of trunnion sections exhibited increasing activity toward the outer end of the trunnion and decreasing activity toward its radial center. The trunnion sections did not include end pieces, which have been reported to collect noticeable ⁷Be on their leading surfaces. No significant ⁷Be was detected in the samples analyzed. The Underground Counting Facility at Savannah River Laboratory (SRL) was used in this work. The facility is 50 ft. underground, constructed with low-background shielding materials, and operated as a clean room. The most sensitive analyses were performed with a 90%-efficient HPGe gamma-ray detector, which is enclosed in a purged active/passive shield. Each sample was counted for one to six days in two orientations to yield more representative average activities for the sample. The non-standard geometries of the LDEF samples prompted the development of a novel calibration method, whereby the efficiency about the samples surfaces (measured with point sources) predicted the efficiency for the bulk sample.
Report Numbers:
E 1.99:wsrc-ms--91-171
E 1.99: conf-9106256--3
conf-9106256--3
wsrc-ms--91-171
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
07/22/1991.
"wsrc-ms--91-171"
" conf-9106256--3"
"DE92008850"
1. Long Duration Exposure Facility (LDEF) post-retrieval symposium,Kissimmee, FL (United States),2-8 Jun 1991.
Winn, W.G.
Funding Information:
AC09-89SR18035
View MARC record | catkey: 13803015