RADIONUCLIDE CONTENT IN SOME BUILDING-MATERIALS IN SYRIA AND THEIR INDOOR GAMMA DOSE-RATE

Radionuclide contents of materials used in the cement industry and nat ural raw building materials in Syria have been determined by gamma spe ctrometry. Samples crushed and counted in Marinelli beaker bricks, cer amic, fireclay and phosphogypsum showed higher levels of radioactivity . Sand, cement, marble and limestone contained lower values. All sampl es fulfilled the criteria set up by OECD except the phosphogypsum. The absorbed gamma dose rate in indoor air was estimated to be 25.2 nGy.h -1: this value has been corrected for build-up, windows and door facto rs.