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  • Space Radiation  (2)
  • CHEMISTRY AND MATERIALS (GENERAL)  (1)
  • Electronic structure and strongly correlated systems  (1)
  • 1
    Publication Date: 2019-07-18
    Description: For over 35 years, astronauts in low Earth orbit or on missions to the moon have been exposed to space radiation comprised of high-energy protons, heavy ions, and secondary neutrons. We reviewed the radiation exposures received by astronauts in space and on Earth, and presented results from the first epidemiological study of cataract incidence in the astronauts. Our data suggested an increased risk for cataracts from space radiation exposures. Using parametric survival analysis and the maximum likelihood method, we estimated the dose-response and age distribution for cataract incidence in astronauts by space radiation. Considering the high-LET dose contributions on specific space missions as well as data from animal studies with neutrons and heavy ions, suggested a linear response with no dose-threshold for cataracts. However, there are unanswered questions related to the importance and the definition of clinically significant cataracts commonly used in radiation protection, especially in light of epidemiological data suggesting that the probability that sub-clinical cataracts will progress is highly dependent on the age at which cataracts appear. We briefly describe a new study that will address the measurement of cataract progression-rates in astronauts and a ground-based comparison group.
    Keywords: Space Radiation
    Type: ISOT; Oct 19, 2004 - Oct 20, 2004; Fort Worth, TX; United States
    Format: text
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  • 2
    Publication Date: 2019-07-18
    Description: For over 35 years, astronauts in low Earth orbit or on missions to the moon have been exposed to space radiation comprised of high-energy protons, heavy ions, and secondary neutrons. We reviewed the radiation exposures received by astronauts in space and on Earth, and presented results from the first epidemiological study of cataract incidence in the astronauts. Our data suggested an increased risk for cataracts from space radiation exposures*. Using parametric survival analysis and the maximum likelihood method, we estimated the dose-response and age distribution for cataract incidence in astronauts by space radiation. Considering the high-LET dose contributions on specific space missions as well as data from animal studies with neutrons and heavy ions, suggested a linear response with no dose-threshold for cataracts. However, there are unanswered questions related to the importance and the definition of "clinically significant" cataracts commonly used in radiation protection, especially in light of epidemiological data suggesting that the probability that "sub-clinical" cataracts will progress is highly dependent on the age at which cataracts appear. We briefly describe a new study that will address the measurement of cataract progression-rates in astronauts and a ground-based comparison group.
    Keywords: Space Radiation
    Type: ISOT; Oct 19, 2004 - Oct 20, 2004; Fort Worth, TX; United States
    Format: text
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  • 3
    Publication Date: 2013-08-31
    Description: The results of the Trapped Radiation Effects Panel for the Space Environmental Effects on Materials Workshop are presented. The needs of the space community for new data regarding effects of the space environment on materials, including electronics are listed. A series of questions asked of each of the panels at the workshop are addressed. Areas of research which should be pursued to satisfy the requirements for better knowledge of the environment and better understanding of the effects of the energetic charged particle environment on new materials and advanced electronics technology are suggested.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA(SDIO Space Environmental Effects on Materials Workshop, Part 2; p 597-605
    Format: application/pdf
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  • 4
    Publication Date: 2011-05-06
    Description: Author(s): F. Hardy, D. Aoki, C. Meingast, P. Schweiss, P. Burger, H. v. Löhneysen, and J. Flouquet The field dependence of the electronic specific heat γ(H) of URhGe is determined using temperature-dependent magnetization measurements and Maxwell’s relation for all three orthorhombic directions. A large (≈40%) enhancement of γ(H) is found at the reorientational transition H_{R} for fields a... [Phys. Rev. B 83, 195107] Published Thu May 05, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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