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Radioactivities of Long Duration Exposure Facility (LDEF) materials: Baggage and bonanzasRadioactivities in materials onboard the returned Long Duration Exposure Facility (LDEF) satellite were studied by a variety of techniques. Among the most powerful is low background Ge semiconductor detector gamma ray spectrometry. The observed radioactivities are of two origins: those radionuclides produced by nuclear reactions with the radiation field in orbit and radionuclides present initially as contaminants in materials used for construction of the spacecraft and experimental assemblies. In the first category are experiment related monitor foils and tomato seeds, and such spacecraft materials as Al, stainless steel, and Ti. In the second category are Al, Be, Ti, Va, and some special glasses. Consider that measured peak-area count rates from both categories range from a high value of about 1 count per minute down to less than 0.001 count per minute. Successful measurement of count rates toward the low end of this range can be achieved only through low background techniques, such as used to obtain the results presented here.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Smith, Alan R.
(California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Hurley, Donna L.
(California Univ. Berkeley. Lawrence Berkeley Lab, CA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts
Subject Category
Atomic And Molecular Physics
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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