A borax fusion technique to cast glass discs for quantitative X-ray analysis is described in detail. The method is based on the “nonwetting” properties of a Pt/Au alloy towards molten borax, on the favourable composition of the flux and finally on the favourable form of the casting mould. The critical points of the technique are stressed, resulting in a method which could be carried out successfully by inexperienced workers. In general the method compares favourably in speed and accuracy with wet-chemical methods.
van Willigen, J. H. H. G., Kruidhof, H., & Dahmen, E. A. M. F. (1971). A borax fusion technique for quantitative X-ray fluorescence analysis. Talanta, 18(4), 450-452. https://doi.org/10.1016/0039-9140(71)80067-X