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Scoping estimates of the LDEF satellite induced radioactivityThe Long Duration Exposure Facility (LDEF) satellite was recovered after almost six years in space. It was well-instrumented with ionizing radiation dosimeters, including thermoluminescent dosimeters, plastic nuclear track detectors, and a variety of metal foil samples for measuring nuclear activation products. The extensive LDEF radiation measurements provide the type of radiation environments and effects data needed to evaluate and help resolve uncertainties in present radiation models and calculational methods. A calculational program was established to aid in LDEF data interpretation and to utilize LDEF data for assessing the accuracy of current models. A summary of the calculational approach is presented. The purpose of the reported calculations is to obtain a general indication of: (1) the importance of different space radiation sources (trapped, galactic, and albedo protons, and albedo neutrons); (2) the importance of secondary particles; and (3) the spatial dependence of the radiation environments and effects expected within the spacecraft. The calculational method uses the High Energy Transport Code (HETC) to estimate the importance of different sources and secondary particles in terms of fluence, absorbed dose in tissue and silicon, and induced radioactivity as a function of depth in aluminum.
Document ID
Document Type
Contractor Report (CR)
Armstrong, Tony W.
(Science Applications International Corp. Prospect, TN, United States)
Colborn, B. L.
(Science Applications International Corp. Prospect, TN, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1990
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NAS 1.26:184074
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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