Abstract
An apparatus to measure the thermal diffusivities of samples of irradiated nuclear fuels at temperatures up to 1200°C is described. A disk-shaped specimen is heated to the desired test temperature in a vacuum furnace. A heat pulse from a ruby laser is absorbed on one face of the specimen and the temperature rise at the rear face is followed by means of the thermal radiation emitted from it. A cone of this radiation is collected by a concave mirror, transmitted through an optical system and focused on to a lead sulphide detector. The output from this is amplified and fed to an ultra-violet, high-speed recorder.
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