Other
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ldef.symp...11r&link_type=abstract
In NASA. Langley Research Center, Second LDEF Post-Retrieval Symposium Abstracts p 11 (SEE N92-27218 18-99)
Other
Clips, End Plates, Gamma Rays, Impurities, Keels, Long Duration Exposure Facility, Radioactivity, Trapped Particles, Cobalt Isotopes, Galactic Cosmic Rays, Manganese Isotopes, Radiation Dosage, Scandium Isotopes, Sodium 22, Steels, Uranium Isotopes
Scientific paper
Final activities are reported for gamma ray emitting isotopes measured in 35 samples from LDEF. In 26 steel trunnion samples, activities of Mn-54 and Co-57 were measured and limits set on other isotopes. In five Al end support retainer plates and two Al keel plate samples, Na-22 was measured. In two Ti clip samples, Na-22 was measured, limits for Sc-46 were obtained, and high activities for impurity Uranium and daughter isotopes were observed. Four sets of depth vs activity profiles were measured for the D sections of the trunnion. For all 4 profiles, the activities first decreased with increasing distance from the surface of the trunnion but were fairly flat near the center. These profiles are consistent with production by both the lower energy (approx. 100 MeV) trapped particles and high energy (approx. 10 GeV) galactic-cosmic ray particles. For the near surface samples, the earth quadrant had more Mn-54 than the space quadrant. For the D sections, there was less Mn-54 in the east trunnion than in the west trunnion. Comparisons are made among the samples and with activities measured by others. The limit for Sc-46 in the Ti clips is compared with the activities of Mn-54 produced in the steel pieces by similar reactions. Activities predicted by several models are compared with the measured activities.
Moss Calvin E.
Reedy Robert C.
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