Musandam peninsula located at one of the most important marine strait overlooking the Arabian/ Parisian Gulf. Environmentally, this area is characterized by its primitivistic status and vulnerable to any natural or manmade disturbances. This work presents the second phase of a comprehensive radiation measurement in Musandam Peninsula environment amid to investigating the presences of depleted , 40K an uranium (DU) residues and assessing the current levels of Ra-226, Ra-228 K-40 and Cs-1(37) in surface soil of coastal area. For this purpose, thirty representative soil samples were collected and analyzed for U-235 using gamma rays spectrometry and for total U using ICP-OES techniques. Results revealed that the range of isotopic abundance of U-235 was (0.70%-0.77%) with an average of 0.72%, confirming the detected uranium is naturally originated from the geological formations of investigated soil. Additionally, the values of Th/U ratios were calculated to be ranged from 0.37 to 1.95 with an average of 1.5 indicating the dominant geological formations are metamorphic sedimentary rocks that contain low levels of Th. The averages of radioactivity levels of NORMs indicated 16.02 Bqkg(-1), 7.83 Bqkg(-1) and 174.03 Bqkg(-1) for Ra-226, Ra-228, and K-40 respectively. The average of areal concentrations for Cs-137 was 2481.5 Bqm(-2) ranges from 1040 Bq/m(2) to 9225 Bqm(-2). The total external annual effective dose from all measured radionuclides was 23 mu SV Cs-237 contribution is 1% while U-238, Th-232 series and K-40 radionuclides contributions are 32%, 28% and 39% respectively. Radium equivalent, external, and internal radiation hazard indices indicate no radiological anomaly. (C) 2018 The Egyptian Society of Radiation Sciences and Applications. Production and hosting by Elsevier B.V.
