The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.

The Determination of Parts per Million Levels of Thorium in Optical Components by X-ray Fluorescence

Volume 29, Number 1 (Feb. 1975) Page 63-67

Keenan, Joseph A.

A nondestructive technique for the determination of thorium in optical glass has been devised using tube-excited x-ray fluorescence with an energy-dispersive detector. Capability for full calibration and sample analysis has been incorporated into a computer-coupled system. Bulk thorium concentrations as low as 87 ppm have been detected with a coefficient of variation of 27.2% at 95% confidence using NBS-certified standards. At 466 ppm the coefficient of variation was 5.6% at the 95% confidence level. Qualitative determination of thorium in optical coatings has been demonstrated also.