ABSTRACT The current study was conducted primarily to investigate and estimate 137Cs activity concentrations and the external dose rate due to fallout radionuclide 137Cs. Soil samples were collected from different 25 locations at Riyadh Province and analyzed using low level γ-spectrometry equipped with HPGe-detector. 137Cs activity concentrations and calculated dose rate were found in the range of 0.8 - 3.1 Bq·kg–1 and 0.05 to 0.8 nSv·h–1 with an average value of 1.70 ± 0.7 Bq·kg–1 and 0.11 ± 0.05 nSv·h–1 respectively. The measured 137Cs activity concentration range was compared with the reported ranges in the literature from some of the other locations in the world. Results obtained in this study show that 137Cs concentration is of a lower level in the investigated area. However, the range of 137Cs concentrations observed in this study is significantly high relative to similar data reported from Libya. The average value of estimated external effective dose rate is found far below the dose rate limit of of 1.0 mSv·y–1 for members of the general public recom-mended by ICRP as well as the external gamma radiation dose of 0.48 mSv·y–1 received per head from the natural sources of radiation assessed by (UNSCEAR, 2000). It is concluded that 137Cs soil contamination does not pose radia-tion hazards to the population in the investigated areas.
Cite this paper
A. Alaamer, "Characterization of 137Cs in Riyadh Saudi Arabia Soil Samples," World Journal of Nuclear Science and Technology, Vol. 2 No. 4, 2012, pp. 161-164. doi: 10.4236/wjnst.2012.24024.
 UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation), “Sources and Effects of Ionizing Radiation,” Report to the General Assembly with Scientific Annexes, United Nations, New York, 1993.
 UNSCEAR (United Nations Scienti?c Committee on the Effects of Atomic Radiation), “Effects and Risks of Ionizing Radiation,” Report to the General Assembly, with Annexes, English, Publishing and Library Section, United Nations Of?ce, 1988.
 A. Noureddin, B. Baggoura, J. J. Larosa and N. Vajda, “Gamma and Alpha Emitting Radionuclides in Some Algerian Soil Samples,” Applied Radiation and Isotopes, Vol. 48, No. 8, 1997, pp. 1145-1148.
 S. N. A. Tahir, K. Jamil, J. H. Zaidi, M. Arif and N. Ahmed, “Activity Concentration of 137Cs in Soil Samples from Punjab Province (Pakistan) and Estimation of Gamma Ray Dose Rate for External Exposure,” Radiation Protection Dosimetry, Vol. 118, No. 3, 2006, pp. 345-351.
 E. Gomez, F. Garcias, M. Casas and V. Cerda, “Determination of 137 Cs and 90Sr in Calcareous Soils: Geographical Distribution on the Island of Majorca,” Applied Radiation and Isotopes, Vol. 48, No. 5, 1997, pp. 699704. doi:10.1016/S0969-8043(96)00330-2
 R. H. Higgy and M. Pimpl, “Natural and Man-Maderadioactivity in Soils and Plants around the Researchreactor of Inshass,” Applied Radiation and Isotopes, Vol. 49, No. 12, 1998, pp. 1709-1712.
 P. Vukotic, G. I. Borisov, V. V. Kuzmic, N. Antovic, S. Dapcevic, V. V. Uvarov and V. M. Kulakov, “Radioactivity on the Montenegrin Coast, Yugoslavia,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 235, No. 12, 1998, pp. 151-157. doi:10.1007/BF02385954
 B. Karakelle, N. Ozturk, A. Kose, A. Varinlioglu, A. Y. Erkol and F. Yilmaz, “Natural Radioactivity Insoil Samples of Kocaeli Basin, Turkey,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 254, No. 3, 2002, pp. 649-651. doi:10.1023/A:1021635415222
 E. Hamed Bashier, I. Salih and A. K. Sam, “Gis Predictive Mapping of Terrestrial Gammaradiation in the Northern State, Sudan,” Radiation Protection Dosimetry Advance Access, Published 15 March 2012.
 M. A. Shenber, “Fallout 137 Cs in Soils from North Western Libya,” Journal of Radioanalytical and Nuclear Chemistry, Vol. 250, No. 1, 2001, pp. 193-194.
 K. Jamil, S. Ali, M. Iqbal, A. A. Qureshi and H. A. Khan, “Measurements of Radionuclides in Coal Samples from Two Provinces of Pakistan and Computation of External Gamma-Ray Dose Rate in Coal Mines,” Journal of Environmental Radioactivity, Vol. 41, No. 2, 1998, pp. 207216. doi:10.1016/S0265-931X(97)00094-5
 J. R. Lamarsh, “Introduction to Nuclear Engineering,” Addison-Wisley, New York, 1983.
 S. Ali, M. Tufail, K. Jamil, A. Ahmad and H. A. Khan, “Gamma-Ray Activity and Dose Rate of Brick Samples Fromsome Areas of North West Frontier Province (NWFP), Pakistan,” Science of the Total Environment, Vol. 187, No. 3, 1996, pp. 247-252.
 P. Jacob and H. G. Paretzke, “Gamma-Ray Exposure from Contaminated Soil,” Nuclear Science and Engineering, Vol. 93, No. 3, 1986, 248-261.
 International Commission on Radiological Protection, “1990 Recommendations of the International Commissionon Radiological Protection,” Annals of the ICRP, ICRP Publication 60, Vol. 21, No. 1-3, Pergamon Press, Oxford, 1991.
 United Nations Scientific Committee on the Effects of Atomic Radiation, “Sources and Effects of Ionizing Radiation,” Report to the General Assembly, New York, 2000.