Author: Myung-Hee Y. Kim
Publisher:
ISBN:
Category : Galactic cosmic rays
Languages : en
Pages : 18

Get Book Here

Book Description

Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725577077
Category :
Languages : en
Pages : 30

Get Book Here

Book Description
Theoretical calculations of radiation attenuation due to energetic galactic cosmic rays behind Martian rock and Martian regolith material have been made to compare their utilization as shields for advanced manned missions to Mars because the detailed chemical signature of Mars is distinctly different from Earth. The modified radiation fields behind the Martian rocks and the soil model were generated by solving the Boltzmann equation using a HZETRN system with the 1977 Solar Minimum environmental model. For the comparison of the attenuation characteristics, dose and dose equivalent are calculated for the five different subgroups of Martian rocks and the Martian regolith. The results indicate that changes in composition of subgroups of Martian rocks have negligible effects on the overall shielding properties because of the similarity of their constituents. The differences for dose and dose equivalent of these materials relative to those of Martian regolith are within 0.5 and 1 percent, respectively. Therefore, the analysis of Martian habitat construction options using in situ materials according to the Martian regolith model composition is reasonably accurate. Adding an epoxy to Martian regolith, which changes the major constituents of the material, enhances shielding properties because of the added hydrogenous constituents. Kim, Myung-Hee Y. and Thibeault, Sheila A. and Simonsen, Lisa C. and Wilson, John W. Langley Research Center NASA/TP-1998-208724, NAS 1.60:208724, L-17722 RTOP 199-45-16-12...

Author: M. Alexander
Publisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 122

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 166

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 256

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category : Exobiology
Languages : en
Pages : 292

Get Book Here

Book Description

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309169593
Category : Science
Languages : en
Pages : 65

Get Book Here

Book Description
This study, commissioned by the National Aeronautics and Space Administration (NASA), examines the role of robotic exploration missions in assessing the risks to the first human missions to Mars. Only those hazards arising from exposure to environmental, chemical, and biological agents on the planet are assessed. To ensure that it was including all previously identified hazards in its study, the Committee on Precursor Measurements Necessary to Support Human Operations on the Surface of Mars referred to the most recent report from NASA's Mars Exploration Program/ Payload Analysis Group (MEPAG) (Greeley, 2001). The committee concluded that the requirements identified in the present NRC report are indeed the only ones essential for NASA to pursue in order to mitigate potential hazards to the first human missions to Mars.

Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 658

Get Book Here

Book Description

Author: Grant Heiken
Publisher: CUP Archive
ISBN: 9780521334440
Category : Science
Languages : en
Pages : 796

Get Book Here

Book Description
The only work to date to collect data gathered during the American and Soviet missions in an accessible and complete reference of current scientific and technical information about the Moon.