Measurements of the thermal radiative properties of liquid uranium

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:6400852

Havstad, M A; McLean, W II ^[1]; Self, S A ^[2]

---

1. Lawrence Livermore National Lab., CA (United States)
2. Stanford Univ., CA (United States). Dept. of Mechanical Engineering

Measurements of the thermal radiative properties of liquid uranium have been made using an instrument with two optical systems, one for measuring the complex index of refraction by ellipsometry, the other for measuring the normal spectral emissivity by direct comparison to an integral blackbody cavity. The measurements cover the wavelength range 0.4 to 10 [mu]m with sample temperatures between 940 and 1630 K. Two 5keV ion sputter guns and an Auger spectrometer produce and verify, in-situ, atomically pure sample surfaces. Good agreement between the two methods is observed for the normal spectral emissivity, which varies with wavelength in a manner typical of transition metals. The two components of the complex index of refraction, the index of refraction and the extinction coefficient, increase with wavelength, from [approximately]3 at 0.4 [mu]m to [minus]20 at 9.5 [mu]m. Both components of polarized reflectivity are shown for visible to infrared wavelengths.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6400852
• Report Number(s): UCRL-JC-111377; CONF-920804--27; ON: DE93012595
• Country of Publication: United States
• Language: English

Related Subjects

050500 -- Nuclear Fuels-- Uranium Enrichment
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSIVITY
ENERGY TRANSFER
FLUIDS
HEAT TRANSFER
LIQUIDS
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIANT HEAT TRANSFER
RADIATIONS
REFLECTIVITY
REFRACTIVE INDEX
SURFACE PROPERTIES
THERMAL RADIATION
URANIUM