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Induced radioactivity of LDEF materials and structural componentsWe present an overview of the Long Duration Exposure Facility (LDEF) induced activation measurements. The LDEF, which was gravity-gradient stabilized, was exposed to the low Earth orbit (LEO) radiation environment over a 5.8 year period. Retrieved activation samples and structural components from the spacecraft were analyzed with low and ultra-low background HPGe gamma spectrometry at several national facilities. This allowed a very sensitive measurement of long-lived radionuclides produced by proton- and neutron-induced reactions in the time-dependent, non-isotropic LEO environment. A summary of major findings from this study is given that consists of directionally dependent activation, depth profiles, thermal neutron activation, and surface beryllium-7 deposition from the upper atmosphere. We also describe a database of these measurements that has been prepared for use in testing radiation environmental models and spacecraft design.
Document ID
20040089396
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Harmon, B. A.
(NASA Marshall Space Flight Center Huntsville AL United States)
Laird, C. E.
Fishman, G. J.
Parnell, T. A.
Camp, D. C.
Frederick, C. E.
Hurley, D. L.
Lindstrom, D. J.
Moss, C. E.
Reedy, R. C.
Reeves, J. H.
Smith, A. R.
Winn, W. G.
Benton, E. V.
Date Acquired
August 21, 2013
Publication Date
November 1, 1996
Publication Information
Publication: Radiation measurements
Volume: 26
Issue: 6
ISSN: 1350-4487
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Radiation Health
LDEF Project
Non-NASA Center
unmanned
Flight Experiment
long duration

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