Determination of Laser-evaporated Uranium Dioxide by Neutron Activation Analysis
Author : Roland Allred
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Page : 120 pages
File Size : 45,98 MB
Release : 1987
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Author : Roland Allred
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Page : 120 pages
File Size : 45,98 MB
Release : 1987
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Page : pages
File Size : 42,37 MB
Release : 1987
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Safety analyses of nuclear reactors require information about the loss of fuel which may occur at high temperatures. In this study, the surface of a uranium dioxide target was heated rapidly by a laser. The uranium surface was vaporized into a vacuum. The uranium bearing species condensed on a graphite disk placed in the pathway of the expanding uranium vapor. Scanning electron microscopy and X-ray analysis showed very little droplet ejection directly from the laser target surface. Neutron activation analysis was used to measure the amount of uranium deposited. The surface temperature was measured by a fast-response automatic optical pyrometer. The maximum surface temperature ranged from 2400 to 3700°K. The Hertz-Langmuir formula, in conjunction with the measured surface temperature transient, was used to calculate the theoretical amount of uranium deposited. There was good agreement between theory and experiment above the melting point of 3120°K. Below the melting point much more uranium was collected than was expected theoretically. This was attributed to oxidation of the surface. 29 refs., 16 figs., 7 tabs.
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Page : 500 pages
File Size : 34,81 MB
Release : 1988
Category : Power resources
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Page : 988 pages
File Size : 38,19 MB
Release : 1988
Category : Nuclear energy
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Page : 912 pages
File Size : 12,67 MB
Release : 1976-04
Category : Nuclear energy
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Page : 1338 pages
File Size : 30,75 MB
Release : 1970
Category : Aeronautics
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Page : 1162 pages
File Size : 50,4 MB
Release : 1973
Category : Nuclear energy
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Page : 1590 pages
File Size : 41,12 MB
Release : 1988
Category : Research
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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Page : 1600 pages
File Size : 49,88 MB
Release : 1988
Category : Government reports announcements & index
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Page : 1256 pages
File Size : 37,21 MB
Release : 1994
Category : Physics
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