An Assessment of Absorbed Dose and Radiation Hazard Index from Natural Radioactivity in Soils from Akwa Ibom State, Nigeria

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Author(s) Bede, M. C | Essiett, A. A | Inam, E.
Pages 80-92
Volume 4
Issue 3
Date March, 2015
Keywords Dose, Radiation, Hazard Index.
Abstract

An assessment of Absorbed Dose Rate and Radiation hazard Index from Natural Radioactivity in Soils from Eastern Obolo, Eket, Ibeno, Ikot Abasi and Uyo local government area of Akwa Ibom state was carried out. The levels of naturally occurring radioactivity in the soil samples were evaluated using NaI (Tl) Model 802 Gamma Ray Spectrometer: The mean concentration of 238U were respectively 11.93±1.63, 8.91±1.39, 21.78±2.32, 12.42±1.63 and 12.13±1.98 Bq.kg-1. The mean concentration of 232Th were respectively 14.75±0.70, 18.96±0.62, 21.47±0.76, 12.76±0.75 and 19.09±0.71 Bq.kg-1.The mean concentration of 40K were respectively 136.86±3.66, 56.82±3.01, 62.34±3.33, 76.16±3.24 and 67.37±3.29 Bq.kg-1. The Absorbed Dose Rate, Eternal Hazard Index and Internal Hazard Index were calculated using the activity concentrations of 238U, 232Th and 40K and the mean values obtained were respectively 20.45, 18.26, 25.99, 16.86, 20.27 nGy.h-1; 0.17, 0.10, 0.15, 0.21, 0.10 Bq.kg-1 and 0.26, 0.13, 0.21, 0.13, 0.15 Bq.kg-1. The obtained values were less than the recommended safety limits of 51 nGy.h-1 and 1 Bq.kg-

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