In this study, the qualitative activity of natural radionuclides was measured for building materials samples, which were collected from an archaeological area in the Sumerian city called "Tell Zughrul". Ten samples was collected from different types of building materials used in building houses, places of worship, and livestock pens. A 3”x3” NaI (Tl) gamma-ray spectroscopy system was used. The results of the measurements showed that the specific activity of U-238, Th-232, Ra226, and K-40 is ranged (from 10.14 - 23.63 Bq/kg) with an average of (16.96 Bq/kg), (9.28 -18.27 Bq/kg) with an average of (15.11 Bq/kg), (6.96 -20.8 Bq/kg) with an average value of (15.2 Bq/kg), and (127.93 - 274.4 Bq/kg) with an average value (209.102 Bq/kg) respectively. To assess the Radiological Hazards of the radioactivity in building material samples, Radium Equivalent Activity, Internal and External Hazard Index, Absorbed Gamma Dose, Representative level index, Annual Effective Dose, and Excess Lifetime Cancer Risk were determined. The results show that all samples of building materials for the ancient area of (Tell Zugrul), were less than the recommended max. Limit values provided by UNSCEAR and ICRP reports, although there are differences in the concentration values of these elements according to the samples.

Natural Radioactivity, Building Materials, Gamma-ray Absorbed Dose, NaI (Tl), Sumerian City.