U. Cevic, N. Damla, A. I. Kobya, A. Celik and A. Kara, “Radiation Dose Estimation and Mass Attenuation Coefficients of Marble Used in Turkey,” Annals of Nuclear Energy, Vol. 37, No. 12, 2010, pp. 1705-1711.
 D. Malczewski, L. Teper and J. Dorda, “Assessment of Natural and Anthropogenic Radioactivity Levels in Rocks and Soils in the Environs of Swieradow Zdroj in Sudetes, Poland, by in Situ Gamma-Ray Spectrometry,” Journal of Environmental Radioactivity Vol. 73, No. 3, 2004, pp. 233-245. http://dx.doi.org/10.1016/j.jenvrad.2003.08.010
 T. A. Myatt, J. G. Allen, T. Minegishi, W. B. Mccarthy, J. H. Stewart, D. L. Macintosh and J. F. Mccarthy, “Assessing Exposure to Granite Countertops-Part 1, Radiation,” Journal of Exposure Science and Environmental Epidemiology, Vol. 20, No. 3, 2010, pp. 273-280.
 Y. Orgün, N. Altinsoy, A. H. Gültekin, G. Karahan and N. Celebi, “Natural Radioactivity Levels in Granitic Plutons and Groundwaters in Southeast Part of Eskisehir, Turkey,” Applied Radiation and Isotopes, Vol. 63, No. 2, 2005, pp. 267-275.
 A. T. Przylibski, “Concentration of 226Ra in Rocks of the Southern Part of Lower Silesia,” Journal of Environmental Radioactivity, Vol. 75, No. 2, 2004, pp. 171-191.
 N. Walley El-Dine, A. El-Shershaby, F. Ahmed and A. S. Abdel-Haleem, “Measurement of Radioactivity and Radon Exhalation Rate in Different Kinds of Marbles and Granites,” Applied Radiation and Isotopes, Vol. 55, No. 6, 2001, pp. 853-860.
 M. S. Yasir, A. Abd Majid and R. Yahaya, “Study of Natural Radionuclides and Its Radiation Hazard Index in Malaysian Building Materials,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 273, No. 3, 2007, pp. 539-541. http://dx.doi.org/10.1007/s10967-007-0905-7
 T. H. Selim and A. I. Kandil, “Characteristics of Marble Industry in Egypt: Structure, Conduct and Performance,” International Business and Economics Research Journal, Vol. 5, No. 1, 2006, pp. 25-34.
 A. G. E. Abbady, “Estimation of Radiation Hazard Indices from Sedimentary Rock in Upper Egypt,” Applied Radiation and Isotope, Vol. 60, No. 1, 2004, pp. 111-114.
 A. M. El Arabi, A. G. E. Abbady and A. S. Hussein, “Gamma-Ray Measurements of Natural Radioactivity in Sedimentary Rocks from Egypt,” Nuclear Science and Techniques, Vol. 17, No. 2, 2006, pp. 123-128.
 M. Tufail, N. Akhter and M. Wqes, “Measurement of Terrestrial Radiation for Assessment of Gamma Dose from Cultivated and Barren Saline Soils of Faisalabad in Pakistan,” Radiation Measurements, Vol. 41, No. 4, 2006, pp. 443-451. http://dx.doi.org/10.1016/j.radmeas.2005.01.007
 N. M. Ibrahim, B. El Ezaby, N. Nada, T. M. Abd ElMakasoud and S. N. Abd El Azem, “Radioactivity Concentration in Some Industrial Ores and Their Waste Products by Gamma Spectrometry,” The 7th Conference of Nuclear Physics and Application, Cairo, 2000, pp. 6-10.
 A. Nada, “Gamma Spectroscopic Analysis for Estimation of Natural Radioactivity Levels in Some Granite Rocks of Eastern Desert, Egypt,” Cairo Arab Journal of Nuclear Science and Application, Vol. 37, No. 2, 2004, pp. 201-222.
 OECD Organization of Economic Cooperation and Development, “Exposure to Radiation from Natural Radioactivity in Building Materials,” Report by a Group of Experts of the OECD Nuclear Energy Agency, OECD, Paris, 1979.
 T. R. Ajayi and O. O. Kuforiji, “Natural Radioactivity Measurement in Rock Samples of Ondo and Ekiti States in Nigeria,” Radiation Measurements, Vol. 33, No. 1, 2000, pp. 13-16.
 G. J. White and A. S. Road, “Radon Emanation from NORM Contaminated Pipe Scale and Soil at Petroleum Industry Sites,” Journal of Environmental Radioactivity, Vol. 54, No. 3, 2001, pp. 401-13.
 M. I. Chowdhury, M. N. Alam and K. S. Ahmed, “Concentration of Radionuclides in Building and Ceramic Materials of Bangladish and Evaluation of Radiation Hazard,” Journal of Radioanalytical Nuclear Chemistry, Vol. 231, No. 1-2, 1998, pp. 117-122.