A Proposed Performance Index For Galactic Cosmic Ray Shielding Materials PDF Download
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Author | : John William Wilson |
Publisher | : |
Total Pages | : 16 |
Release | : 1993 |
Genre | : Biology |
ISBN | : |
Download A Proposed Performance Index for Galactic Cosmic Ray Shielding Materials Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 28 |
Release | : 2018-08-09 |
Genre | : |
ISBN | : 9781725017238 |
Download A Proposed Performance Index for Galactic Cosmic Ray Shielding Materials Book in PDF, ePub and Kindle
In past studies, the reductions in absorbed dose and dose equivalent due to choice of material composition have been used to indicate shield effectiveness against exposure to galactic cosmic rays. However, these quantities are highly inaccurate in assessing shield effectiveness for protection against the biological effects of long-term exposure to the galactic heavy ions. A new quantity for shield performance is defined that correlates well with cell killing and cell transformation behind various shield thicknesses and materials. In addition, a relative performance index is identified that is inversely related to biological injury for different materials at a fixed shield mass and is directly related to the ratio of the fourth- and the second-order linear energy transfer (LET) moments. Wilson, John W. and Wood, J. S. and Shinn, Judy L. and Cucinotta, Francis A. and Nealy, John E. Langley Research Center NASA-TM-4444, L-17199, NAS 1.15:4444 RTOP 592-43-21-01...
Author | : Myung-Hee Y. Kim |
Publisher | : |
Total Pages | : 44 |
Release | : 1994 |
Genre | : Shielding (Radiation) |
ISBN | : |
Download Performance Study of Galactic Cosmic Ray Shield Materials Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 42 |
Release | : 2018-07-09 |
Genre | : |
ISBN | : 9781722482985 |
Download Performance Study of Galactic Cosmic Ray Shield Materials Book in PDF, ePub and Kindle
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. Kim, Myung-Hee Y. and Wilson, John W. and Thibeault, Sheila A. and Nealy, John E. and Badavi, Francis F. and Kiefer, Richard L. Langley Research Center RTOP 199-45-16-11...
Author | : James R. Gaier |
Publisher | : |
Total Pages | : 10 |
Release | : 2012 |
Genre | : |
ISBN | : |
Download Preliminary design of a galactic cosmic ray shielding materials testbed for the International Space Station Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 464 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : John William Wilson |
Publisher | : |
Total Pages | : 496 |
Release | : 1997 |
Genre | : Extraterrestrial radiation |
ISBN | : |
Download Shielding Strategies for Human Space Exploration Book in PDF, ePub and Kindle
The purpose of the workshop was to define requirements for the development and evaluation of high performance shield materials and designs and to develop ideas regarding approaches to radiation shielding.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1994 |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalog of United States Government Publications Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 752 |
Release | : 1994 |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalogue, United States Public Documents Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1220 |
Release | : 1994 |
Genre | : Government reports announcements & index |
ISBN | : |
Download Government Reports Annual Index Book in PDF, ePub and Kindle