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Journal of Applied Sciences
  Year: 2013 | Volume: 13 | Issue: 1 | Page No.: 140-146
DOI: 10.3923/jas.2013.140.146
 
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Measurement of Natural Radioactivity in the Clays Consummated in Côte d’Ivoire using Gamma-ray Spectrometry
Coulibaly Vamoussa, Sei Joseph, Kouame N`Dri, Koua Aka Antonin, Oyetola Samuel and Brun Stephane

Abstract:
The presence of radionuclides in natural materials was one of the major causes of external and internal exposure to ionizing radiation (gamma rays). The knowledge of the radioactivity levels in these commonly used materials was of great importance in the assessment of possible radiological risks to human health. The purpose of this study was to determine the natural radioactivity due to 226Ra, 232Th and 40K of some clay samples consummated in Côte d’Ivoire for their therapeutic virtues by using gamma spectrometry. The activity concentration of 226Ra, 232Th and 40K ranged from 19.0±8.2 to 54.8±20.8 Bq kg-1 (with a mean of 33.6±13.2 Bq kg-1), from 12.8±3.5 to 42.3±12.1 Bq kg-1 (with a mean of 31.3±8.5 Bq kg-1) and from 16.0±59.2 to 790±245 Bq kg-1 (with a mean of 314.1±101.7 Bq kg-1), respectively. Radium equivalent activities and various hazard indices were also calculated to assess the radiation hazard. The Radium equivalent activity (Raeq) ranged from 90.2±28.4 to 130.3±43.8 Bq kg-1 (with an average of 102.6±33.1 Bq kg-1), was lower than the limit of 370 Bq kg-1. The calculated values of external hazard index (Hex) 0.24±0.08-0.35±0.12 and internal hazard index (Hin) 0.32±0.11-0.50±0.18 were also lower than unity. The annual effective dose ranged from 52.2±16.3 to 73.8±24.8 μSv y-1 with a mean of 59.6±19.1 μSv y-1 whereas the effective dose by ingestion varied from 17.1±6.2 to 30.8±11.1 μSv y-1 with an average of 21.3±7.6 μSv y-1. These values were lower than the limit of 1 mSv y-1. From this study, it was found that the use of the investigated clay samples for their therapeutic virtues did not induce significant radiation hazards.
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How to cite this article:

Coulibaly Vamoussa, Sei Joseph, Kouame N`Dri, Koua Aka Antonin, Oyetola Samuel and Brun Stephane, 2013. Measurement of Natural Radioactivity in the Clays Consummated in Côte d’Ivoire using Gamma-ray Spectrometry. Journal of Applied Sciences, 13: 140-146.

DOI: 10.3923/jas.2013.140.146

URL: https://scialert.net/abstract/?doi=jas.2013.140.146

 
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