Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nascp3134..287w&link_type=abstract
LDEF, 69 months in space : first post-retrieval symposium. Edited by Arlene S. Levine. Washington, D.C. : National Aeronautics
Physics
Earth Orbital Environments, Gamma Ray Spectrometers, Long Duration Exposure Facility, Nondestructive Tests, Radiation Effects, Radioactive Isotopes, Spaceborne Experiments, Spectrum Analysis, Chromium Isotopes, Cobalt Isotopes, Manganese Isotopes, Radiometric Resolution, Scandium Isotopes, Sodium 22, Vanadium
Scientific paper
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 Na-22, Sc-46, Cr-51, Mn-54, Co-56, Co-57, Co-58, and Co-60. 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 Be-7 on their leading surfaces. No significant Be-7 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 percent 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.
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