[en] The radioactivity levels for soil and marine sediments of the arabian Gulf and surrounding land areas were measured. The measured samples will be used in future against any increase in radioactivity levels that may occur. There were 27 samples collected from the west bank of the arabian Gulf and surrounding land areas in the eastern region of sausi arabia. marine sediment samples were collected at depths from water surface ranging from 5 up to 25 meters from 10 locations while soil samples were collected from 17 locations. All collected samples fall within a rectangular of 355km length and 163km width. The cities and towns within the rectangular are include Al-Khaji, muneefa, saffaniah, dhahran and buqayg. Concentrations of ⁴0 K, ²38 U, ²26 Ra, ²32 Th and ¹37Cs radionuclides have been determined. The ranges of activities observed for ²23 U and ²32 Th were 17.09 - 39.76 Bq/kg and 0.15-0.95 Bq/kg for marine sediments. For soil samples, the activities observed were 2.81-10.8 Bq/kg for ²38 U and ²32 Th, respectively