Evaluation of Natural Radioactivity in Granite and Marble used as Flooring Materials in Baghdad Province/ Iraq

Abstract

Twenty four samples of various granites and marble used common as flooring materials were collected from many factories and market in Baghdad Province, Iraq. Natural radioactivity of 226 Ra, 232 Th and 40 K in the samples was measured by using high purity germanium detectors with an efficiency of 40%. The Specific activity concentration in granite samples ranged from 9.20 to 79.64 Bq/kg, 10.50 to 229.40 Bq/kg and 185.30 to 1391.20 Bq/kg for 226 Ra, 232 Th and 40 K, respectively. The estimated of radiological parameters: radium equivalent activity (R eq) , activity concentration Index (I) and hazard indices (internal (H in ) and External (H ex )) that associated with the radiation hazard in the samples. The results of activity specific concentrations and radiological parameters of 226 Ra, 232 Th and 40 K were compared with the reported data of the worldwide limit of building materials.