Abstract
A lot of porcelains were found at the Mietsu Naval Facility Site in Saga, Japan, which was approved as a World Heritage by UNESCO in July, 2015. We determined the X-ray fluorescence intensity ratios of Fe, Rb, Sr, Y and Zr involved in the body clay of the porcelains by synchrotron X-ray fluorescence analysis, and compared them with those excavated from the Saga castle site and with Amakusa or Izumiyama porcelain stones. The X-ray fluorescence intensity ratio of each element was the highest for Fe in all samples, but other chemical elements depended on the kind of porcelain and the porcelain stone. Sr was the lowest for porcelain stones, but increased greatly for porcelains. A plot of log {Intensity ratio (Rb/Sr)} vs. log {Intensity ratio (Zr/Sr)} gave a good straight line. The data for the porcelain stones gathered in the 1st quadrant and those of the porcelains of the Saga castle site shifted a little to the left lower side, but those of porcelains of the Mietsu Naval Facility site shifted to the more left and lower side. The change in the intensity ratio of elements was ascribed to the porcelain stones used and to the manufacturing process of the clay.
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