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http://dx.doi.org/10.1016/j.net.2017.07.020

Analysis of radioactivity levels and hazard assessment of black sand samples from Rashid area, Egypt  

Abdel-Rahman, Mohamed A.E. (Nuclear Engineering Department, Military Technical College)
El-Mongy, Sayed A. (Nuclear and Radiological Regularity Authority (ENRRA))
Publication Information
Nuclear Engineering and Technology / v.49, no.8, 2017 , pp. 1752-1757 More about this Journal
Abstract
The aim of this study is to evaluate the radioactivity levels and radiological impacts of representative black sand samples collected from different locations in the Rashid area, Egypt. These samples were prepared and then analyzed using the high-resolution gamma ray spectroscopy technique with a high-purity germanium detector. The activity concentration ($A_c$), minimum detectable activity, absorbed gamma dose rate, external hazard index ($H_{ex}$), annual effective dose rate equivalent, radium equivalent, as well as external and internal hazard index ($H_{ex}$ and $H_{in}$, respectively) were estimated based on the measured radionuclide concentration of the $^{238}U$($^{226}Ra$) and $^{232}Th$ decay chains and $^{40}K$. The activity concentrations of the $^{238}U$, $^{232}Th$ decay series and $^{40}K$ of these samples varied from $45.11{\pm}3.1Bq/kg$ to $252.38{\pm}34.3Bq/kg$, from $64.65{\pm}6.1Bq/kg$ to $579.84{\pm}53.1Bq/kg$, and from $403.36{\pm}20.8Bq/kg$ to $527.47{\pm}23.1Bq/kg$, respectively. The activity concentration of $^{232}Th$ in Sample 1 has the highest value compared to the other samples; this value is also higher than the worldwide mean range as reported by UNSCEAR 2000. The total absorbed gamma dose rate and the annual effective dose for these samples were found to vary from 81.19 nGy/h to 497.81 nGy/h and from $99.86{\mu}Sv/y$ to $612.31{\mu}Sv/y$, which are higher than the world average values of 59 nGy/h and $70{\mu}Sv/y$, respectively. The $H_{ex}$ values were also calculated to be 3.02, 0.47, 0.63, 0.87, 0.87, 0.51 and 0.91. It was found that the calculated value of $H_{ex}$ for Sample 1 is significantly higher than the international acceptable limit of <1. The results are tabulated, depicted, and discussed within national and international frameworks, levels, and approaches.
Keywords
Black Sand; Environmental Impact; Gamma Spectrometry; Radioactivity Levels; Radiological Hazards Assessment;
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  • Reference
1 G.R. Gilmore, Practical Gamma-ray Spectroscopy, second ed., John Wiley & Sons, New York, 2008, p. 408.
2 IAEA, Thorium Fuel Cycle: Potential Benefits and Challenges, in IAEA-TECDOC, 1450, 2005.
3 M. Abd El Wahab, H.A. El Nahas, Radionuclides measurements and mineralogical studies on beach sands, East Rosetta Estuary, Egypt, Chin. J. Geochem. 32 (2013) 146-156.   DOI
4 A.W. Klement Jr. (Ed.), CRC Handbook of Environmental Radiation, CRC Press, Boca Raton, FL, 1982.
5 C. Monty, UNSCEAR Report 2000: United Nations Scientific Committee on the effects of atomic radiation, sources and effects of ionizing radiation, J. Radiol. Protect. 21 (2001) 83.   DOI
6 H. Cember, T. Johnson, Introduction to Health Physics, fourth ed., McGraw-Hill, New York, NY, 2008.
7 S.F. Hassan, M.A.M. Mahmoud, M.A.E. Abd El-Rahman, Effect of radioactive minerals potentiality and primordial nuclei distribution on radiation exposure levels within muscovite granite, Wadi Nugrus, Southeastern Desert, Egypt, J. Geosci. Environ. Protect. 4 (2016) 62-78.
8 D. Malain, P.H. Regan, D.A. Bradley, M. Matthews, T. Santawamaitre, H.A. Al-Sulaiti, Measurements of NORM in beach sand samples along the Andaman coast of Thailand after the 2004 tsunami, Nucl. Instrum. Methods Phys. Res. A 619 (2010) 441-445.   DOI
9 M.R. Khattab, H. Tuovinen, J. Lehto, I.E. Al Assay, M.G. El Feky, M.A. Abd. El-Rahman, Determination of uranium in Egyptian graniteic ore by gamma, alpha, and mass spectrometry, Instrum. Sci. Technol. 45 (2017) 338-348.   DOI
10 G.A. Dabbour, The Egyptian placer deposits d a potential source for nuclear raw materials, in: Proceedings of the Second Arab Conference on the Peaceful Uses of Atomic Energy, Cairo, 1994.
11 J. Lilley, Nuclear Physics: Principles and Applications, J. Wiley & Sons, New York, 2001.
12 A.G.E. Abbady, M.A.M. Uosif, A. El-Taher, Natural radioactivity and dose assessment for phosphate rocks from Wadi El-Mashash and El-Mahamid Mines, Egypt, J. Environ. Radioact. 84 (2005) 65-78.   DOI
13 M. Tzortzis, H. Tsertos, S. Christofides, G. Christodoulides, Gamma-ray measurements of naturally occurring radioactive samples from Cyprus characteristic geological rocks, Radiat. Meas. 37 (2003) 221-229.   DOI
14 Y. Orgun, N. Altinsoy, S.Y. Sahin, Y. Gungor, A.H. Gultekin, G. Karahan, Z. Karacik, Natural and anthropogenic radionuclides in rocks and beach sands from Ezine region (Canakkale), Western Anatolia, Turkey, Appl. Radiat. Isot. 65 (2007) 739-747.   DOI
15 S. Fares, A. Ashour, M. Abd El-Rahma, M. El-Ashry, Gamma radiation hazards and risks associated with wastes from granite rock cutting and polishing industries in Egypt, Yaderna ta Radyiatsyijna Bezpeka 1 (2012) 64-73.