Gamma spectrometric characterization of raw materials used in ceramic industry in Spain

Autores UPV
Año
CONGRESO Gamma spectrometric characterization of raw materials used in ceramic industry in Spain

Abstract

A total of 25 raw materials used by the Spanish ceramic industry were analyzed: various types of clay and kaolin, silica, borax, zirconium silicate, zirconium oxide, etc. These materials are used mostly for manufacturing a variety of products: frits and glazes, pigments, tiles, bricks, tableware, sanitary ware, etc. In addition, these raw materials combined in different proportions, give rise to another type of raw materials used in the manufacture of ceramic tiles. These products are the following: atomized, frits and pigments. A total of 18 of them have been analyzed in this work. On each sample has been performed a gamma spectrometry analysis and quantified the following radionuclides: 234Th, 226Ra, 214Pb, 214Bi, 210Pb, 235U, 228Ac, 212Pb, 212Bi, 208Tl and 40K. The results show very different values depending on the origin of the raw material. Thus, the values of activity concentration concentrations to 238U decay series are between DL (Detection Limit) and 4000 Bq.kg-1for micronized zirconium silicate. Activity concentration values to 232Th decay series are between the DL and 700 Bq.kg-1, for micronized zirconium silicate also. Activity concentration values of 40K range between DL and 1300 Bq.kg-1, corresponding to a particular type of red clay. The full paper will present a description of the samples, the material and methods used for the gamma spectrometry characterization and the full set of results found.