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Home  >  Volume 36 (no2)

Title: Evaluation of Natural Radionuclide and Dose Assessment in Soil around Aluminium processing industries in Sango-Ota, Nigeria by Ademola A. K (pages 237-244)
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Abstract

The activity concentrations of natural radionuclides 226Ra, 232Th and 40K in soil samples collected from four aluminium processing industries in Sango-Ota, Nigeria were measured by gamma spectrometry using high-purity germanium detector.  The values of 226Ra, 232Th and 40K in the samples ranged from 5-10, 2–4 and 148-200 Bqkg−1, respectively  in aluminium waste and 16 – 69, 17-87 and 101-562 Bqkg−1, respectively, in the soil samples. All the mean activity concentrations of the radionuclide in the samples are lower than the world average except for 226Ra which is slightly higher in soil. The radium equivalent activity concentrations and the absorbed dose rates in the samples are below the recommended values. The calculated external and internal hazard indices are less than unity as required. The annual gonadal dose equivalents in all the samples are lower than the world average.  The mean annual effective dose in aluminium waste samples is 17.9 and in soil 53.2 μSvy−1, which is lower than the 1 mSvy−1 recommended for the general public. The estimated fatality cancer effect is lower than the UNSCEAR limit.  The results obtained show that the workers and the public are not at risk as far as radiological hazard is concerned. 

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