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flash6669
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3楼2010-07-04 13:54:42
flyaway7371
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2楼2010-07-04 13:50:26
yanghui2521
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Ionizing radiation exposure of LDEF (Pre-recovery estimates) This article is not included in your organization's subscription. However, you may be able to access this article under your organization's agreement with Elsevier. E.V. Benton†, W. Heinrich‡, T.A. Parnell§, T.W. Armstrong¶, J.H. Derrickson§, G.J. Fishman§, A.L. Frank†, J.W. Watts Jr§ and B. Wiegel‡ †Physics Department, University of San Francisco, San Francisco, CA 94117-1080, U.S.A. ‡Physics Department, University of Siegen, 5900 Siegen, F.R.G. ¶SAIC (Loc. 476), Route 2, Prospect, TN 38477, U.S.A. Received 31 October 1990; revised 20 March 1991. Available online 29 August 2002. Abstract The long duration exposure facility (LDEF), launched into a 258 nautical mile orbit with an inclination of 28.5°, remained in space for nearly 6 yr. The 21,500 lb NASA satellite was one of the largest payloads ever deployed by the Space Shuttle. LDEF completed 32,422 orbits and carried 57 major experiments representing more than 200 investigators from 33 private companies, 21 universities and nine countries. The experiments covered a wide range of disciplines including basic science, electronics, optics, materials, structures and power and propulsion. A number of the experiments were specifically designed to measure the radiation environment. These experiments are of specific interest, since the LDEF orbit is essentially the same as that of the Space Station Freedom. Consequently, the radiation measurements on LDEF will play a significant role in the design of radiation shielding of the space station. The contributions of the various authors presented here attempt to predict the major aspects of the radiation exposure received by the various LDEF experiments and therefore should be helpful to investigators who are in the process of analyzing experiments which may have been affected by exposure to ionizing radiation. The paper discusses the various types and sources of ionizing radiation including cosmic rays, trapped particles (both protons and electrons) and secondary particles (including neutrons, spallation products and high-LET recoils), as well as doses and LET spectra as a function of shielding. Projections of the induced radioactivity of LDEF are also discussed. Work partially supported by NASA Grant NAG8-138, NASA George C. Marshall Space Flight Center, Marshall Space Flight Center, AL 35812, U.S.A. |
4楼2010-07-04 21:27:32
yanghui2521
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5楼2010-07-04 21:32:16
