Abstract
The crude copper in molten state includes some gaseous constituents, and the ingot of the crude copper becomes porous. The test piece disk cut off from the ingot hence has many pits on its surface which give serious influences on the proportionality of X-ray intensity and the concentration of impuri-ties. But this influence of the surface state was reduced by using copper as an internal standard.
The linear calculation line was obtained in the range Sb 0.030.08% and Pb 0.1 0.3% by plotting the X-ray intensity ratio Sb-Kα/Cu-Kβ (2nd) or Pb-Lβ/Cu-Kβ (2nd) vs. antimony or lead content. The results by this method gave good agreements with those by the chemical analysis. The time required was about 10 minutes.
The distribution of antimony and lead was also investigated by chemical analysis, optical micrography and electron probe X-ray microanalysis. The randomness of their distribution and the propriety of this method of sampling were confirmed.
