Helium Generation And Diffusion In Graphite And Some Carbides 14 9 And 14 4 Mev Neutrons PDF Download
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Total Pages | : |
Release | : 1976 |
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Download Helium Generation and Diffusion in Graphite and Some Carbides. [14. 9 and 14. 4 MeV Neutrons]. Book in PDF, ePub and Kindle
The cross section for the generation of helium in neutron irradiated carbon was found to be 654 mb at 14.4 MeV and 744 mb at 14.9 MeV. Extrapolating to 14.1 MeV (the fusion reactor spectrum) gives 615 mb. The diffusion of helium in dense polycrystalline graphite and in pyrographite was measured and found to be D = 7.2 x 10−7 m2s−1 exp ( -80 kJ/RT). It is assumed that diffusion is primarily in the basal plane direction in crystals of the graphite. In polycrystalline graphite the path length is a factor of .sqrt. 2 longer than the measured distance due to the random orientation mismatch between successive grains. Isochronal anneals (measured helium release as the specimen is steadily heated) were run and maximum release rates were found at 200°C in polycrystalline graphite, 1000°C in pyrographite, 1350°C in boron carbide, and 1350° and 2400°C (two peaks) in silicon carbide. It is concluded that in these candidates for curtain materials in fusion reactors the helium releases can probably occur without bubble formation in graphites, may occur in boron carbide, but will probably cause bubble formation in silicon carbide. 7 figures.
Author | : United States. Energy Research and Development Administration |
Publisher | : |
Total Pages | : 806 |
Release | : 1977 |
Genre | : Power resources |
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Download ERDA Energy Research Abstracts Book in PDF, ePub and Kindle
Author | : United States. Energy Research and Development Administration. Technical Information Center |
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Total Pages | : 982 |
Release | : 1977 |
Genre | : Force and energy |
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Total Pages | : 508 |
Release | : 1988 |
Genre | : Neutrons |
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Download Neutron Dosimetry Book in PDF, ePub and Kindle
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Total Pages | : 760 |
Release | : 1980 |
Genre | : Power resources |
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Download Energy Research Abstracts Book in PDF, ePub and Kindle
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author | : United States. Energy Research and Development Administration |
Publisher | : |
Total Pages | : 768 |
Release | : 1977-08 |
Genre | : Power resources |
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Download ERDA Energy Research Abstracts Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 744 |
Release | : 1975 |
Genre | : Nuclear energy |
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Total Pages | : 1204 |
Release | : 1986 |
Genre | : Nuclear energy |
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Download INIS Atomindeks Book in PDF, ePub and Kindle
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Total Pages | : 1072 |
Release | : 1977 |
Genre | : Aeronautics |
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Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : Joseph M. Harrer |
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Total Pages | : 1052 |
Release | : 1973 |
Genre | : Technology & Engineering |
ISBN | : 9780870790058 |
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