Abstract
The natural radioactivity existed since creation of the universe due to the long life time of some radionuclides. This natural radioactivity is caused byγ-radiation originating from the uranium and thorium series and40K. In this study, the gamma radiation has been measured to determine natural radioactivity of238U,232Th, and40K in collected sedimentary rock samples in different places of Turkey. The measurements have been performed usingγ-ray spectrometer containing NaI(Tl) detector and multichannel analyser (MCA). Absorbed dose rate (D), annual effective dose (AED), radium equivalent activities (Raeq), external hazard index (Hex), and internal hazard index (Hin) associated with the natural radionuclide were calculated to assess the radiation hazard of the natural radioactivity in the sedimentary rock samples. The average values of absorbed dose rate in air (D), annual effective dose (AED), radium equivalent activity (Raeq), external hazard index (Hex), and internal hazard index (Hin) were calculated and these were 45.425 nGy/h, 0.056 mSv/y, 99.014 Bq/kg, 0.267, and 0.361, respectively.
Highlights
The natural radioactivity existed since creation of the universe due to the long life time of radionuclide
This natural radioactivity is caused by γ-radiation originating from the uranium and thorium series and 40 K
Natural radioactivity arising from natural sources is the main contribution to the annual dose received by the world’s population, exposure resulting from radionuclides inherent in the earth’s crust and from cosmic rays
Summary
The natural radioactivity existed since creation of the universe due to the long life time of radionuclide. This natural radioactivity is caused by γ-radiation originating from the uranium and thorium series and 40 K. Gamma radiation emitted from such naturally occurring radionuclides in all ground formations represents the main external exposure to human body [1]. Natural environmental radioactivity and the associated external exposure due to gamma radiation depend primarily on the geological and geographical conditions and appear at different levels in the soils and rocks of each region in the world [2,3,4]
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