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In this study, the activity concentration of natural ( 238 U, 232 Th, 40 K)and artificial radionuclides (137 Cs) were measurements in six different brandsof tea have been collected from local market in Ethiopia (Addis Ababa city).have been analyzed by a detection system consisting of High Purity Germanium(HPGe) detector and multichannel analyzer. The average activity concentrationswere nuclide M D A report 238U, 232Th and 40 K respectively. The mean valueswere found 3.66$ \pm$0.47, 18.28$\pm $2.4 and 582.59$ \pm $29.64 Bq/kgrespectively. The activity concentration of 40K is increasing faster than theother NORM for Tea. In order to evaluate the radiological hazard of the naturalradioactivity, radium equivalent (Raeq ), the external hazard index (Hex),internal hazrd index (Hin) , the total absorbed dose rate (D), the annualeffective dose equivalent (AEDE) have been calculated and compared with theinternational acceptable value.

Investigations of Natural Radioactivity levels and Assessment of radiological hazard of Tea samples collected from local market in Ethiopia