International Journal of Physics
ISSN (Print): 2333-4568 ISSN (Online): 2333-4576 Website: Editor-in-chief: B.D. Indu
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International Journal of Physics. 2015, 3(5), 224-229
DOI: 10.12691/ijp-3-5-5
Open AccessArticle

Measurement of Surface Dose Rate of Nuclear Radiation in Coastal Areas of Akwa Ibom State, Nigeria

Essiett A. A.1, Essien I. E.1 and Bede M. C.1,

1Department of Physics, University of Uyo, Nigeria

Pub. Date: November 05, 2015

Cite this paper:
Essiett A. A., Essien I. E. and Bede M. C.. Measurement of Surface Dose Rate of Nuclear Radiation in Coastal Areas of Akwa Ibom State, Nigeria. International Journal of Physics. 2015; 3(5):224-229. doi: 10.12691/ijp-3-5-5


In this study, the surface doses rate measurements were done in-situ using dose rate meters. The analysis of naturally occurring radionuclides (40K, 238U and 232Th) has been carried out in soil samples collected from Eastern Obolo, Ikot Abasi, and Ibeno local government areas of Akwa Ibom State, using gamma spectroscopy operated on a Canberra vertical high purity 2’’×2’’ NaI(Tl) model 802 detector. The activity concentration ( of the samples ranges from 34.65±2.56 to 214.12±4.34 with mean value 94.60±3.42 for 40K, 5.12±0.38 to 38.5±2.38 with mean value 15.16±1.83 for 238U and 0.03±0.77-30.59 with mean value 15.40±0.73 for 232Th. This study also examines some radiation hazard indices, the mean values obtained are 44.46, 20.52 nGy.h-1, 0.02 mSv, 0.17, 0.20 for Radium Equivalent activity (Raeq), Absorbed Dose rate (D), Annual Effective Dose Rate (Eeff Dose), External Hazard index (Hex) and internal Hazard index (Hin) respectively. These calculated hazard indices to assess the potential radiological health risk in soil and the dose associated with it are well below their permissible limit. The soil and sediments from the study area provide no excessive exposures for inhabitants and can be use as construction material without posing any immediate radiological threat to the public. However, the public is cautioned against excess exposure to avoid future accumulative dose of these radiations.

natural radioactivity radiological hazards NaI (Tl) Detector gamma-ray spectrometry

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[1]  Scholten, L. C. and Timmermans, C. W. M. Natural Radioactivity in Phosphate Fertilizers, Fertilizer Research, 43: 103-107, 1996.
[2]  Raad, O. H. and Hayder H. H. Natural Occuring Radionuclides Materials. Radioisotopes Applications in Physical Sciences. Available at, 2011.
[3]  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, United Nations Office at Vienna, 2008.
[4]  Masita A., Zani H., Ahmad S., Mohamat O., and Abdul Khalik W. An Assessment of Absorbed Dose and Radiation Hazard Index from Natural Radioactivity. The Malaysian Journal of Analytical Science, 2(1): 67-72, 2008.
[5]  Tso, M. Y. and Leung, J. K. Population dose due to natural radiations in Hong Kong. Health Physics, 8:555-78, 2000.
[6]  UNSCEAR. (United Nations Scientific Committee on Effects of Atomic Radiation) sources and effects of Ionizing Radiation (New York: United Nations), 1993.
[7]  Obed, R. I., Farai, I. P. and Jibiri, N. N. Population Dose Distribution Due to Soil Radioactivity Concentration Levels in 18 Cities across Nigeria. Journal of Radiological Protection, 25: 305-312, 2005.
[8]  Chikasawa, K., Ishii T. and Ugiyama, H. Terrestrial Gamma Radiation in Kochi Prefecture, Japan. Journal of Health Sciences, 47, 361-372, 2001.
[9]  Tzortzis, M., Svoukis, E. and Tsertos, H. A comprehensive study of natural gamma radioactivity levels and associated dose rates from surface soils in Cyprus. Radiation Protection Dosimetry Journal, 109, 217-224, 2004.
[10]  UNSCEAR. Source and Effects of Ionizing Radiation. Report to General Assembly, with Scientific Annexes. United Nations Scientific Committee on the Effects of Atomic Radiation, United Nations, New York, pp 265-273, 2000.
[11]  UNSCEAR. Source and Effects of Ionizing Radiation. Report to General Assembly, with Scientific Annexes. United Nations Scientific Committee on the Effects of Atomic Radiation, United Nations, New York, pp. 19-220, 2010.
[12]  Muneer, A. S., Ahmad, T. R., Yasser, A and Abubakar, S. A. Assessment of Natural Radiation Levels and Associated Dose Rate from Surface Soils in Pontian District, Jahor, Malaysia. Journal of Ovonic Research, 9(1): 17-27, 2013.
[13]  Faanu, A., Adukpo, O. K., Okoto, R. J. S., Diabor, E., Darko, E. O., Emi-Reynolds, G., Awudu, A. R., Glover, E. T., Tandoh, J. B., Ahiamadjie, H., Otoo, F., Adu, S. and Kpordzro, R. Determination of Radionuclides in Underground Water Sources within the Environments of University of Cape Coast. Research Journal of Environmental and Earth Sciences, 3(3): 269 -274, 2011.
[14]  Menager, M. T., Health, M. J, Ivanovich, M, Montjotin, C., Barillon, C. R., Camp, J. and Hasler, S. E. Migration of uranium-mineralised fractures into the rock matrix in granite: implications for radionuclide Transport around a radioactive waste repository, Radiochimica Acta, 66(7): 44-83, 1993.
[15]  NCRP, National Council on Radiation Protection and Measurements, Exposure of the population in the United States and Canada from Natural Background Radiation. No.94, USA, 1987.
[16]  Taiwo, B. A. and Tse, C. A. Spatial Variation in Groundwater Geochemistry and Water Quality Index in Port Harcourt. Scientia Africana, 8(1): 134-155, 2009.
[17]  Agbalagba, E. O. and Onoja, R. A. Evaluation of Natural Radioactivity in Soil, Sediment and Water samples of Niger Delta (Biseni) Flood Plain Lakes, Nigeria. Journal of Environmental Radioactivity, 102: 667-671, 2011.
[18]  Senthilkumar, B., Dhavamani, V., Ramkuma, S. and Philominathan, P. Measurement of Gamma Radiation Levels in Soil Samples from Thanjavur, using γ-ray Spectrometry and Estimation of Population Exposure. Journal of Medical Physics, 35: 48-53, 2010.
[19]  Awudu, A. R., Darko, E. O., Schandorf, C., Hayford, E. K., Abekoe, M. K. and Ofori- Danson, P. K. Determination of Activity Concentration Levels of 238U, 232Th and 40K in Drinking Water in a Gold Mine in Ghana. Operational Radiation Safety and Health Physics Journal, 99 (2): 149-153, 2010.
[20]  Faure, G. Principles of Isotopes Geology. 2nd ed., California: John Wiley and son, p. 189, 1986.