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Performance study of galactic cosmic ray shield materials
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Author and Affiliation:
Kim, Myung-Hee Y.(College of William and Mary, Williamsburg, VA., United States)
Wilson, John W.(NASA Langley Research Center, Hampton, VA, United States)
Thibeault, Sheila A.(NASA Langley Research Center, Hampton, VA, United States)
Nealy, John E.(NASA Langley Research Center, Hampton, VA, United States)
Badavi, Francis F.(Christopher Newport Coll., Newport News, VA., United States)
Kiefer, Richard L.(College of William and Mary, Williamsburg, VA., United States)
Abstract: The space program is faced with two difficult radiation protection issues for future long-term operations. First, retrofit of shield material or conservatism in shield design is prohibitively expensive and often impossible. Second, shielding from the cosmic heavy ions is faced with limited knowledge on the physical properties and biological responses of these radiations. The current status of space shielding technology and its impact on radiation health is discussed herein in terms of conventional protection practice and a test biological response model. The impact of biological response on the selection of optimum materials for cosmic ray shielding is presented in terms of the transmission characteristics of the shield material. Although the systematics of nuclear cross sections are able to demonstrate the relation of exposure risk to shield-material composition, the current uncertainty in-nuclear cross sections will not allow an accurate evaluation of risk reduction. This paper presents a theoretical study of risk-related factors and a pilot experiment to study the effectiveness of choice of shield materials to reduce the risk in space operations.
Publication Date: Nov 01, 1994
Document ID:
19950010497
(Acquired Dec 28, 1995)
Accession Number: 95N16912
Subject Category: SPACE RADIATION
Report/Patent Number: NASA-TP-3473, L-17389, NAS 1.60:3473
Document Type: Technical Report
Publisher Information: United States
Contract/Grant/Task Num: RTOP 199-45-16-11
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 38p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: BIOLOGICAL EFFECTS; GALACTIC COSMIC RAYS; HEAVY IONS; IONIZING RADIATION; PHYSIOLOGICAL RESPONSES; RADIATION PROTECTION; RISK; SHIELDING; THERMAL STABILITY; AEROSPACE MEDICINE; EXPOSURE; HEALTH; SPACECREWS
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