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Al Neelian University (2021)

Evaluation of natural radioactivity and determination of concentrations of some elements around Jebel Mun areas in Western Darfur

Hamdi Abdelnabi Abdalla Amin

Titre : Evaluation of natural radioactivity and determination of concentrations of some elements around Jebel Mun areas in Western Darfur

Auteur Hamdi Abdelnabi Abdalla Amin

Université de soutenance : Al Neelian University

Grade : PhD Degree in Analytical Chemistry 2021

Résumé
This study was conducted on Jebel Mun areas in Western Darfur to evaluate the concentration of natural radioactivity and to determine the concentrations of some elements. A total of about 113 samples from soil, rock, crops, leaves, and water samples were collected from this area. Activity concentrations of 238U, 232Th, 228Ra, 40K, and 137Cs have been measured by High Germanium Gamma Spectrometry (HGGS). The indoor and outdoor annual effective dose was calculated by survey meter (RD1706).Radiation hazards, the radium equivalent, and the absorbed gamma dose rate at 1 meter above the ground surface was calculated using the equation based on gamma analysis from radionuclides. XRF technique was used to determine the elements concentrations in soil, rocks, and crops. Finally some element water, soil, rocks, leaves, and water samples were measured using ICP-OES and ICP-AES techniques. The maximum concentrations activity revealed for soil samples were (283) for232Th, (273) for228Ra,(1820) for 40K, and(10.8) Bq/kg for 137Cs. While rock samples maximum values were recorded 154, 158, and 2760 Bq/kg for 232Th, 228Ra, and 40K respectively. Whereas crop samples maximum concentration activity was obtained 120, 7.30, 5.42, and 555 Bq/kg. While in leaves were ranged 22.5, 34.0, 47.8 and1340Bq/kg for 232Th, 228Ra,226Ra, and 40K respectively. The indoor and outdoor annual effective dose was found to be 0.07 to 1.96 mSv/y. However, 5 sites are above the allowable limit ICRP 1 mSv/y.Radiation hazards was estimated to be from 0.23 to 2.18. it was clearly found that four sites are highest than ICRP limit, the radium equivalent was calculated for soil and rock samples and was found to be 84.2 to 808 Bq/kg for soil samples, while in rock samples ranged between 35.1 to 555 Bq/kg .The study found that four sites higher for soil samples and fourteen sites for rock samples, were exceeded 370 Bq/kg by UNSCEAR. While the absorbed gamma dose rate at 1 meter above the ground surface, of the soil samples estimated 40.2 to372 nGy/h. Comparing the absorbed dose rate in the air and in this study with other areas in Sudan such as EL-Gash, it was 37.5nGy/h while Sinnar was 38.80 nGy/h this study the highest was estimated (107 nGy/h).

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Page publiée le 15 janvier 2022