コンピュータ画像処理を応用した鉄鉱石中の微量Ga分布のEPMA観察

抄録

In order to reveal the segregation of small amount of Ga in iron ores, a technique of computer image processing was applied to improve the resolution of concentration in EPMA X-ray images. In this technique, first, the net X-ray intensity was obtained by applying a back-ground correction on a pair of X-ray images observed with the wave-lengthes at the peak and the tail positions of the profile of characteristic Ga X-ray, respectively. Next, a computer image processing of the moving average with a large filter size was applied to improve the resolution of concentration in the X-ray images.
This technique was applied to reaveal the segregation of Ga in the region smaller than a few micron meters in the concentration range of 100∼250 ppm in the iron ore with the average concentration of Ga 54 ppm. The magnetite contained fine minerals of the order of a few micron meters and Ga was concentrated in these small minerals.