Title: High temperature radiance spectroscopy measurements of solid and liquid uranium and plutonium carbides
Authors: MANARA DarioDE BRUYCKER FrankBOBORIDIS KonstantinosELOIRDI RachelTOUGAIT OlivierMALKI Mohammed
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 426 no. 1-3 p. 126-138
Publication Year: 2012
JRC N°: JRC68645
ISSN: 0022-3115
URI: http://www.sciencedirect.com/science/article/pii/S0022311512001626
DOI: http://dx.doi.org/10.1016/j.jnucmat.2012.03.041
Type: Articles in periodicals and books
Abstract: In this work is reported an experimental study of the radiance of liquid and solid uranium and plutonium carbides at wavelengths 550nm   920 nm. A fast multi-channel spectro-pyrometer has been employed for the radiance measurements of samples heated up to and beyond their melting point by laser irradiation. The melting temperature of uranium monocarbide, soundly established at 2780 K, has been taken as a radiance reference. Based on it, a wavelength-dependence has been obtained for the high-temperature spectral emissivity of some uranium carbides (1  C/U  2). Similarly, the peritectic temperature of plutonium monocarbide (1900 K) has been used as a reference for plutonium mono-carbide and sesquicarbide. The present spectral emissivities of solid uranium and plutonium carbides are close to 0.5 at 650 nm, in agreement with previous literature. However, their high temperature behaviour, value in the liquid, carbon-content and wavelength dependences in the visible-near infrared range have been determined here for the first time. Liquid uranium carbide seems to interact with electromagnetic radiation in a more metallic way than does the solid, whereas a similar effect has not been observed for plutonium carbides. The current emissivity values have also been used to convert into real temperature the measured radiance spectra, and thus perform a thermal analysis of the laser heated samples. Some high-temperature phase boundaries in the systems U-C and Pu-C are shortly discussed on the basis of the current results.
JRC Directorate:Nuclear Safety and Security

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