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The spacific activity of naturally radionuclides ( 226 Ra,  212 Pb, and  40 K) in water samples of Tigris river was tested using a NaI(Tl) scintillation detector at 30 separate locations in tigris river in Iraq’s Salah Al-Din Governorate. The activity concentrations of activity of  226 Ra,  212 Pb,  137 Cs, and  40 K ranged from ( 0.056, 0.702, 0.15, 105.12 Bq/L ) to ( 805.6, 75.12, 27.6, 1149.4 Bq/L ), with an average of ( 315.6, 30.8, 12.04, and 509.2 Bq/L) respectively. The average The radium equivalent activity was found to be (397.4 Bg/kg). The absorbed dose rate in air for the samples was also investigated, and its averagr of (185.6 nGyh-1). For one year, the outdoor annual effective doses with an average of (0.23mSv/y), and the indoor annual effective doses with an average of (0.911mSv/y). The external hazard indices, as well as the internal hazard indices, were found to be more than one higher than the global limit, with average values of 2.04 and 2.89, respectively, higher than the global limit. The International Commission on Radiological Safety and Ionizing Radiation’s Biological Effects Radiation risk factors is used to measure the excess lifetime cancer risk.

Radioactivity Investigation In Water of Tigris River in Salah Al-Din Governorate, Iraq