Further analyses have been performed on a U02-B4C fuel element which was thermally tested under both radial and axial thermal gradients. A new sampling technique was employed which permitted the division of radial samples into smaller volumes of material than was previously used for boron analyses. With this technique, the boron losses, predicted for open systems, was observed, especially in that region of the fuel which was operating above 13500C, No significant boron migration was detected in either the radial or axial directions in the fuel element, indieating that the boron losses were carried off in the flowing helium stream, verifying earlier results in open systems.
A method has been developed for the analysis of hafnium metal for aluminum, copper, iron, titanium, and tungsten in the ppm range and zirconium in the 1 0–4.0% range. Solid machined pieces 1 × 1 in. or larger are used. Spectra are excited with a low voltage ignited ac arc with low inductance and capacitance. Hafnium serves as the internal standard The method offers an increase in speed and improved precision over the carrier distillation technique which has been commonly used
Further analyses have been performed on a U02-B4C fuel element which was thermally tested under both radial and axial thermal gradients. A new sampling technique was employed which permitted the division of radial samples into smaller volumes of material than was previously used for boron analyses. With this technique, the boron losses, predicted for open systems, was observed, especially in that region of the fuel which was operating above 13500C, No significant boron migration was detected in either the radial or axial directions in the fuel element, indieating that the boron losses were carried off in the flowing helium stream, verifying earlier results in open systems.
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