Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

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Abstract: Eighteen samples of sediments collected from Um Bogma, South Western Sinai, and twelve granite samples collected from Gabal Gattar, North Eastern Desert in Egypt have been investigated. Concentrations of radionuclides in sediment and granite samples were determined by γ-ray spectrometer using HPGe detector with a specially designed shield. The content of uranium is high in sediments and granite samples, and the content of ⁴⁰K in granite is higher than that in sediments. The absorbed dose rate ranged from 419 to 3908 nGy/h for sediment samples and from 1002 to 1307 nGy/h for granite samples. The representative external hazard indicies (Hex) for sediment and granite samples were estimated. The state of radioactive disequilibrium in the U-series at Um Bogma and Gabal Gattar areas were also studied. The activity ratios between ²²⁶Ra/²³⁸U for sediment and granite were calculated. Thorium to Uranium concentration ratios (Clark value) was also estimated. The total excess lifetime cancer risk (ELCR) was measured.

Keywords: natural radioactivity, HPGe detector, sediment, granite, disequilibrium, excess lifetime cancer risk, activity ratio.

1. M.S. Al-Masri et al. External gamma-radiation dose to Syrian population based on the measurement of gamma-emitters in soils. Journal of Radioanalylical and Nuclear Chemistry 267(2) (2006) 337. https://doi.org/10.1007/s10967-006-0052-6

2. R. Fujiyoshi, S. Sawamura. Mesoscale variability of vertical profiles of environmental radionuclides (⁴⁰K, ²²⁶Ra, ²¹⁰Pb and ¹³⁷Cs) in temperate forest soils in Germany. Science of the Total Environment 320 (2004) 177. https://doi.org/10.1016/j.scitotenv.2003.08.007

3. A.M. Gbadebo, A.J. Amos. Assessment of radionuclide pollutants in bedrock and soils from Ewekoro cement factory, South Nigeria. Asian J. Applied Sci. 3 (2010) 135.

4. Radionuclides in Ecosystems (Washington, USEPA, 2007). https://www3.epa.gov/radtown/ecosystems.html

5. M. Harenyama et al. Two-dimensional measurement of natural radioactivity of granitic rocks by photosimulated luminescence technique. Geochemical Journal 34(1) (2000) 1. https://www.terrapub.co.jp/journals/GJ/pdf/3401/34010001.pdf

6. J.H. Doveton, D.F. Merriam. Borehole petrophysical chemostratigraphy of Pennsylvanian black shales in the Kansas subsurface. Chem. Geol. 206 (2004) 249. https://doi.org/10.1016/j.chemgeo.2003.12.027

7. T. Weissbrod. The Paleozoic of Israel and adjacent countries. Part 2: The Paleozoic outcrops in southwestern Sinai and their correlation with those of southern Israel. Geological Survey of Israel Bulletin 48 (1969) 32 p. Article

8. M.A. El Sharkawi, M.M. El Aref, A.A. Mottelib. Manganese deposits in Carboniferous paleokarst profile, Um Bogma Region, west-central Sinai, Egypt. Mineralium Deposita 25 (1990) 34. https://doi.org/10.1007/BF03326381

9. I.E. Aassy et al. Uranium in laterites, Southwestern Sinai, Egypt. In: First seminar on nuclear raw materials and their technology (Cairo, Egypt, 1 - 3 Nov., 1999) 1.

10. I.E. El Aassy et al. Report on the prospection and proving of some radioactive occurrences in west central Sinai, Egypt. Internal Report. (Cairo, Nuclear Materials Authority, 1986).

11. A.E. Omar. Geoenvironmental and radioactivity assessment of east Abu Zenima area, southwestern Sinai, Egypt using remote sensing and JIS. PhD Thesis (Egypt, Suez Canal University, 2016) 236 p.

12. M.Y. Attawiya. Petrochemical and geochemical studies of granite rocks from Gable Gattar area, Eastren Desert, Egypt. Arab. J. Nucl. Sci. Appl. 23(2) (1990) 13.

13. M.H. Shalaby, A.F. Moharem. Geochemistry and radioelement distribution in the fresh and altered hammamat sedimentary rocks along Wadi Baligh, North Eastern Desert, Egypt. Sedimentology of Egypt: journal of the Sedimentological Society of Egypt 9 (2001) 145.

14. M.L. EL Rakaiby, M.H. Shalaby. Geology of Gebel Qattar batholith, central Eastern Desert, Egypt. Int. J. Remote Sens. 13(12) (1992) 2337. https://doi.org/10.1080/01431169208904272

15. A.B. Salman, M.H. Shalaby, L.M. Noseir. Uranium province, Northern Red Sea Hills, Egypt. In: Proc. of the Intern. Earth Sciences Congress on Aegean Regions (Izmir, Turkey, 1 - 6 Oct., 1990) Vol. 1, p. 89.

16. H.M. EL Shatoury, M.E. Mostafa, E.F. Nasr. Granites and granitoid rocks in Egypt, a statistical approach of classification. Chemie der Erde 43 (1984) 83.

17. J.K. Greenberg. Characteristics and origin of Egyptian younger granites. Geological Society of America Bulletin 92 (1981) 749. https://doi.org/10.1130/GSAB-P2-92-749

18. M.E. Roz. Geology and uranium mineralization of Gebel Qattar area, North Eastern Desert, Egypt. M.Sc. thesis. (Egypt, Cairo, Al-Azhar University, 1994).

19. Preparation and certification of IAEA gamma-ray spectrometry reference materials. RGU-1, RGTh-1 and RGK-1. IAEA/RL/148. International Atomic Energy Agency, 1987. 54 p. http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/18/088/18088420.pdf

20. R.M. Anjos et al. Natural radionuclide distribution in Brazilian commercial granites. Radiat. Meas. 39 (2005) 245. https://doi.org/10.1016/j.radmeas.2004.05.002

21. S. Turhan, L. Gunduz. Determination of specific activity of ²²⁶Ra, ²³²Th and ⁴⁰K for assessment of radiation hazards from Turkish pumice samples. J. Environ. Radioact. 99 (2008) 332. https://doi.org/10.1016/j.jenvrad.2007.08.022

22. R.A. Sutherland, E. de Jong. Statistical analysis of gamma-emitting radionuclide concentrations for three fields in southern Saskatchewan, Canada. Health Phys 58 (1990) 417. https://journals.lww.com/health-physics/Abstract/1990/04000/Statistical_Analysis_of_Gamma_emitting.4.aspx

23. Sources and Effects of Ionizing Radiation. Report to General Assembly with Scientific Annexes (New York, United Nations Scientific Committee on the Effect of Atomic Radiation, 2010). http://www.unscear.org/unscear/en/publications/2008_1.html

24. M. Tufail et al. Natural radioactivity from the building materials used in Islamabad and Rawalpindi, Pakistan. Science of the Total Environmental 121 (1992) 283. https://doi.org/10.1016/0048-9697(92)90321-I

25. A.A. Qureshi et al. Evaluation of excessive lifetime cancer risk due to natural radioactivity in the rivers sediments of Northern Pakistan. Journal of Radiation Research and Applied Science 7 (2014) 438. https://doi.org/10.1016/j.jrras.2014.07.008

26. H. Taskin et al. Radionuclide concentrations in soil and lifetime cancer risk due to the gamma radioactivity in Kiklareli, Turkey. J. Environ. Radioact. 100 (2009) 49. https://doi.org/10.1016/j.jenvrad.2008.10.012