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2020•Journal of Nuclear and Particle PhysicsOpen access

Investigations of Natural Radioactivity Levels and Assessment of Radiological Hazard of Tea Samples Collected from Local Market in Ethiopia

Tadelech Sisay Mekonnen, Tilahun Tesfaye Deressu

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Abstract

In this study, the activity concentrations of natural (238U, 232Th, 40K) and artificial radionuclides (137Cs) were measured in six different brands of tea samples. The samples have been collected from local market in Ethiopia (Addis Ababa city) and analysis was done by a detection system consisting of High Purity Germanium (HPGe) detector and multichannel analyser. The average activity concentrations of 238U, 232Th and 40K were found to be 3.66±0.47, 18.28±2.4 and 582.59±29.64 Bq/kg respectively. The activity concentration of 40K is increasing faster than the other NORM for Tea. In order to evaluate the radiological hazard of the natural radioactivity, radium equivalent (Raeq), the external hazard index (Hex), internal hazard index (Hin), the total absorbed dose rate (D), and the annual effective dose equivalent (AEDE) have been calculated and compared with the international acceptable values.

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What this paper is about

In this study, the activity concentrations of natural (238U, 232Th, 40K) and artificial radionuclides (137Cs) were measured in six different brands of tea samples. The samples have been collected from local market in Ethiopia (Addis Ababa city) and analysis was done by a detection system consisting of High Purity Germanium (HPGe) detector and multichannel analyser. The average activity concentrations of 238U, 232Th and 40K were found to be 3.66±0.47, 18.28±2.4 and 582.59±29.64 Bq/kg respectively. The activity concentration of 40K is increasing faster than the other NORM for Tea. In order to evaluate the radiological hazard of the natural radioactivity, radium equivalent (Raeq), the external hazard index (Hex), internal hazard index (Hin), the total absorbed dose rate (D), and the annual effective dose equivalent (AEDE) have been calculated and compared with the international acceptable values.

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Available abstract

In this study, the activity concentrations of natural (238U, 232Th, 40K) and artificial radionuclides (137Cs) were measured in six different brands of tea samples. The samples have been collected from local market in Ethiopia (Addis Ababa city) and analysis was done by a detection system consisting of High Purity Germanium (HPGe) detector and multichannel analyser. The average activity concentrations of 238U, 232Th and 40K were found to be 3.66±0.47, 18.28±2.4 and 582.59±29.64 Bq/kg respectively. The activity concentration of 40K is increasing faster than the other NORM for Tea. In order to evaluate the radiological hazard of the natural radioactivity, radium equivalent (Raeq), the external hazard index (Hex), internal hazard index (Hin), the total absorbed dose rate (D), and the annual effective dose equivalent (AEDE) have been calculated and compared with the international acceptable values.

Key concepts: Radium, Absorbed dose rate, Natural radioactivity, Radiological weapon, Effective dose (radiation), Radionuclide, Environmental science, Analyser

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