DETERMINATION OF RADON AND NATURAL RADIOACTIVITY CONCENTRATION IN SOME BUILDING MATERIALS USED IN IZMIR, TURKEY

The aim of this study is to determine the radon and natural radioactivity concentrations of some building materials and to assess the radiation hazard associated with those mortar materials when they are used in the construction of dwellings. Radon measurements were realized by using LR-115 Type 2 solid state nuclear track detectors. Radon activity concentrations of these materials were found to vary between 130.00 +/- 11.40 and 1604.06 +/- 40.5 Bq m(-3). The natural radioactivity in selected mortar materials was analyzed by using scintillation gamma spectroscopy. The activity concentrations for Ra-226, Th-232 and K-40 for the studied mortar materials ranged from ND to 48.5 +/- 7.0 Bq kg(-1), ND to 41.0 +/- 6.4 Bq kg(-1) and ND to 720.4 I 26.8 Bq kg(-1), respectively. Radium equivalent activities, external and internal hazard indexes, gamma and alpha indexes and absorbed gamma dose rates were calculated to assess the radiation hazard of the natural radioactivity in studied samples. The calculated Ra-eq values of all samples were found to be lower than the limit of 370 Bq kg(-1) set for building materials. The estimated hazard index values were found to be under the unity and the absorbed dose rate values were also below the worldwide average of 84 nGy h(-1).