Vertical distribution of natural and artificial (137Cs) radionuclides in soils surrounding the phosphogypsum deposit at Taiba Ndiaye, Senegal

Coumba THIANDOUME, Ousmane NDOUR, Mbayang GUEYE, Alassane TRAORE, Papa Mbaye DIOUF, Aicha MBENGUE, Adams TIDJANI

Résumé


In this study, natural radionuclides (238U, 226Ra, 210Pb, 232Th, and 40K) and 137Cs in soil profiles in the vicinity of phosphoric acid production industry in Taiba Ndiaye (Senegal) were determined using gamma-ray spectrometry. The activity concentrations of 226Ra, 232Th, and 40K in this study were lower than their values given by UNSCEAR (1982).  APb/ ARa ratio was calculated and showed an excess of 210Pb. A study of the vertical distribution of 238U, 226Ra, 210Pb, 232Th, 40K, and 137Cs was also conducted. The radium equivalent activity (Raeq) calculated is 32.03 ± 2.91 Bq.kg−1, which was lower than the recommended limit of 370 Bq.kg-1. The obtained values of absorbed dose rate (D) and the annual effective dose rate (AEDE) were 14.45 ± 1.37 nGy.h-1 and 17.72 ± 1.68 µSv.y-1, respectively and found less than the recommended limit values reported by UNSCEAR (2000).


Mots-clés


Natural radionuclides, 137Cs, Vertical distribution, Absorbed dose rate, and Annual effective dose

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Références


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