Evaluation of Natural Radioactivity Levels of Pre-Cambrian Basement Rocks from the South-Western Margin of Arabian-Nubian Shield, Sudan
- 569 Downloads
This study aimed to investigate the activity concentration levels of 238U and 40K for the basement rocks using in situ gamma-ray spectrometry to set a base data to be used as a reference in case of any radiological accident. In average, the activity concentration levels of 40K are 1226 Bg\kg and 860 Bq\kg in migmatite gneisses and micaschist, respectively. The higher levels in the migmatite gneisses are due to high concentration of feldspar minerals. These average values are either analogous or higher than the standard concentration levels of continental crust. The activity concentration levels of 238U from migmatite gneisses show an average value of 42.4. The micaschist displays an average value of 45.6 Bq\kg. These values are greatly elevated than the average values recorded from basement rocks worldwide.
KeywordsIn situ gamma-ray spectrometry Natural radioactivity Basement rocks North kordofan state Sudan
The authors wish to express their deep appreciation and gratitude to the team of SAEC for analyzing the collected samples.
- 1.UNSCEAR: Source and affects of ionizing radiation. Report to General Assembly, with Scientific Annexes, United Nations, New York (1993)Google Scholar
- 2.El-Mageed, A.I., El-Kamel, A.H., Abbady, A., Harb, S., Youssef, A.M.M., Saleh, I.I.: Assessment of natural and anthropogenic radioactivity levels in rocks and soils in the environments of Juban town in Yemen Radiation. Phys. Chem. 80(2011), 710–715 (2011)Google Scholar
- 3.Sam, A.K., Holm, E.: The natural radioactivity in phosphate deposits from Sudan. Sci. Total Environ., 162, 173Ð178 (1995)Google Scholar
- 5.Vail, J.R.: Outline of The Geological of The Nuba Mountains and Vicinity. Southern Kordofan Province, Sudan (1973)Google Scholar
- 6.Vail, J.R.: Outline of the geology and mineral deposit of the democratic Republic of the Sudan and adjacent areas. Overseas Geology and Mineral Resources, 49 (1978)Google Scholar
- 7.IFAD: Re-Appraisal Report, vol. II. Annexes, Elobeid, Sudan (1999)Google Scholar
- 8.Eisenbud, M., Gesell, T.: Environmental Radioactivity from Natural, Industrial and Military Sources, pp. 134–200. Acad.press, SanDiego, CApp (1997)Google Scholar
- 9.UNSCEAR: Source and affects of ionizing radiation. Report to General Assembly with Scientific Annexes, United Nations, New York.Mukhtar, A. (2003): Environmental Study for Radionuclides at Miri Lake. Ph.D. Thesis, Faculty of Science, Department of Physics, University of Khartoum (2000)Google Scholar