The Emanation of Radon-220 from Sintered UO2 Powders and Plates PDF Download
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Author: J. C. Clayton
Publisher:
ISBN:
Category : Radon
Languages : en
Pages : 34
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Book Description
Author: J. C. Clayton
Publisher:
ISBN:
Category : Radon
Languages : en
Pages : 34
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The emanation of thoron (Rn/sup 220/) from sintered UO/sub 2/ powders and plates was measured as a function of temperature. The uranium oxide samples were indexed with radiothorium by coprecipitation and coevaporation techniques. The emanation measurements were performed in a flow system, using an alpha scintillation detector and a helium-hydrogen carrier gas mixture. Both the radiothorium concentration (5 to 100 mu C/g UO/sub 2/) and the uranium oxide density (71 to 99 percent TD) were varied. The surface areas and densities of the UO/sub 2/ plates were measured by krypton gas adsorption and liquid immersion techniques, respectively. Assuming a diffusion mechanism, diffusion coefficients for thoron in sintered UO/sub 2/ were calculated as a function of temperature. The data were represented by an equation of the form, D = D/sub O/ exp (-Q/RT). An apparent increase in both activation energy (Q) and D/sub O/ with density was observed for the 1100 to 1450 deg C temperature range. For some samples the thoron emanating power could be measured at temperatures as low as 400 deg C. Log D versus 1/T plots from 400 to 1450 deg C gave intersecttng straight lines with different activation energies. One intersection occurred near the Tammann temperature. The emanation of Rn/sup 220/ from UO/sub 2/ apparently involves several types of diffusion processes. (auth).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The emanation of thoron (Rn22°) from sintered UO2 powders and plates was measured as a function of temperature. The uranium oxide samples were indexed with radiothorium by coprecipitation and coevaporation techniques. The emanation measurements were performed in a flow system, using an alpha scintillation detector and a helium-hydrogen carrier gas mixture. Both the radiothorium concentration (5 to 100 mu C/g UO2) and the uranium oxide density (71 to 99 percent TD) were varied. The surface areas and densities of the UO2 plates were measured by krypton gas adsorption and liquid immersion techniques, respectively. Assuming a diffusion mechanism, diffusion coefficients for thoron in sintered UO2 were calculated as a function of temperature. The data were represented by an equation of the form, D = D/sub O/ exp ( -Q/RT). An apparent increase in both activation energy (Q) and D/sub O/ with density was observed for the 1100 to 1450 deg C temperature range. For some samples the thoron emanating power could be measured at temperatures as low as 400 deg C. Log D versus 1/T plots from 400 to 1450 deg C gave intersecttng straight lines with different activation energies. One intersection occurred near the Tammann temperature. The emanation of Rn22° from UO2 apparently involves several types of diffusion processes. (auth).
