keywords: Cattle-dung, grass, Lagos, natural radionuclides, Nigeria, rearing-field, soil
Estimating the levels of radiation in the environment is crucial in implementing appropriate controls towards radiological protection. The aim of this study was to determine the radioactivity levels in the grass, soils and dung using a well calibrated thallium-doped sodium iodide scintillator detector. The radioactivity level in the soil ranged from 301.18 to 440.48 Bqkg-1 with a mean value of 403.07±33.85 Bqkg-1; 10.19 to 13.05 Bqkg-1 with a mean value of 11.47±0.75 Bqkg-1 and 9.12 to 11.97 Bqkg-1 with a mean value of 10.44±0.75 Bqkg-1 for 40K, 238U and 232Th. The activity concentrations in the grass samples ranges from 202.41 to 99.57 Bqkg-1 with a mean value of 115.46±21.68 Bqkg-1; 11.21 to 8.44 Bqkg-1 with a mean value of 10.06±0.75 Bqkg-1 and 10.50 to 3.00 Bqkg-1 with a mean value of 8.31±2.76 Bqkg-1 for 40K, 238U and 232Th while the activity concentration in the dung samples ranged from 115.21 to 225.44 Bqkg-1 with a mean value of 184.90±40.92 Bqkg-1; 10.13 to 13.17 Bqkg-1 with a mean value of 11.50±0.78 Bqkg-1 and 8.12 to 11.28 Bqkg-1 with a mean value of 10.20±0.71 Bqkg-1 for 40K, 238U and 232Th. The mean values of soil-grass transfer factors were 0.29±0.05, 0.88±0.10 and 0.80±0.27 for 40K, 238U and 232Th respectively. The values reported for the soil samples were lower than the world average values of 410.0 Bqkg-1; 35.0 Bqkg-1 and 28.0 Bqkg-1 for 40K, 238U and 232Th. The results indicated a possible low radiological effect on human feeding on cattle beef in the study area.
Ababneh AM 2009. Radioactivity concentrations in soil and vegetables from the northern Jordan rift valley and the corresponding dose estimates. Radiat. Prot. Dosim., 134: 30-37. Abbady EGA, Uosif MAM & El-Taher A 2005. Natural radioactivity and dose assessment for phosphate rocks from Wadi El-Mashash and El-Mahamid mines, Egypt. J. Environ. Radiat., 84: 65-78. Abu-Khadral SA, Abdel-Sabour MF, Abdel-Fattah AT & Eissa HS 2008. Transfer Factor of Natural Radionuclides from Egyptian Soils to Roots and Leaves of the Wheat Plant, 15-19, Cairo. Alausa SK 2012. Radioactivity in farm soils and food crops are grown in Jos and Abeokuta Nigeria and its associated cancer risks. A Doctorate Dissertation, University of Ibadan, Nigeria. Alausa SK, Olabamiji AO & Kola Odunaike 2015. Estimation of natural radionuclides in cattle from a rearing-field at Alabata, Abeokuta, Ogun State, South Western, Nigeria. J. National Assoc. Math. Phy., 29: 353-362. Alharbi A & El – Taher A 2013. A study on transfer factors of radionuclides from soil to plant. Life Science Journal, 2. http://www.lifesciencesite.com. Retrieved 22 October 2018. Hafezi S, Amidi J & Attarilar A 2005. The Concentration of Natural Radionuclides in Soil and Assesment of External Exposure to the Public in Tehran-Iran. Iran J. Radiation Resou., 3(2): 85-88. IAEA 1989. Measurements of Radionuclides in Food and the Environment, in International Atomic Energy Agency Tech. 1989, IAEA: Vienna. Ilori AO, Alausa SK & Ajanaku O 2017. Activity Concentrations, Absorbed Dose Rate and Annual Effective Dose of Surface Soils of Agege, Lagos State, Southwestern Nigeria. J. National Assoc. Math. Phy.,42: 357-360. Jamal Al-Jundi 2015. 226Ra, 228Ra and 40K activity concentration in some vegetable consumed in Jordan and resultant annual ingestion effective dose. J. Indian Assoc. for Radiation and Protection (IARP), 38: 29-34. Jibiri NN & Ajao AO 2005. Natural Activities of 40K, 238U and 232Th in elephant grass (Pennisetum purpureum) in Ibadan Metropolis, Nigeria. J. Envtal. Radioactivity, 78(1): 105. Jibiri NN, Farai IP & Alausa SK 2006. Activity concentration of 226Ra, 228Th and 40K in different food crops from a high background radiation area in Bitsichi, Jos Plateau, Nigeria. J. Envtal. Radioactivity, 90(1): 29 – 36. L’Annunziata MF 2007. Radioactivity: Introduction and History, Amsterdam: Elsevier, B.V. Mofunanya AAJ, Ebigwai JK, Bello OS & Egbe AO 2015. Comparative study of the effects of organic and inorganic fertilizer on nutritional composition of Amaranthus spinosus L. Asian J. Plant Sci., 14(1): 34-39. NPC 2006. National Population Census Report, Federal Republic of Nigeria. web.archieve.org. Retrieved 12 November, 2018. Obiora DN & Onwuka OS 2005. Groundwater exploration in Ikorodu, Lagos Nigeria: A surface geophysical in survey contribution. The Pacific J. Sci. and Techn., 6(1) 86-93. Ojo TJ & Afolayan BO 2013. Distribution of radionuclide concentration with proximity to the Lagoon in Lagos state, Southwestern Nigeria. Advance in Physics Theories and Applications, 15: 5 – 7. Salbu B, Lind OC & Skipperud L 2004. Radionuclide specification and its relevance in environmental impact assessment. J. Envtal. Radioactivity, 2: 25-57. Shyamal RC, Razaul A, Rahman AKM & Sarker R 2013. Radioactivity concentration in soil and transfer factors of radionuclides from soil to grass and plants in the Chittagong city of Bangladesh. J. Physical Sci., 24(1): 95-113.