Journal of the Faculties of Science and Agriculture, Delta State University, Abraka, Nigeria

ISSN: 1119-9008
DOI: 10.5987/UJ-NJSE


DOI: 10.5987/UJ-NJSE.17.129.1   |   Article Number: 7D8F5C1C4   |   Vol.15 (1) - November 2017

Authors:  Oyibo B and Mokobia C E

Keywords: Delta State, Background ionization radiation, farms, immediate monitoring

In-situ background ionization radiation (BIR) level in 25 farms spread across the local government areas of Delta State, Nigeria was measured using a FOS 2011+ radiation metre, with reading accuracy of 0.001.  The precise positions of the locations were determined using a geographical positioning device (GPS). Results show that the BIR levels range from 0.008 – 0.014 mRh-1, with a mean of 0.009 ± 0.0004 mRh-1.  Three (12 %) of the studied farm lands have radiation levels higher than the 0.013 mRh-1recommended by the ICRP. The mean values of the radiation health parameters obtained are 7.19 mGyy-1, 3.78 mSvy-1 and 12.46 x 10-3 for dose rate, annual equivalent dose and excess life-time cancer risk, each of which is higher than the corresponding internationally recommended value of 1.0 mGy-1, 1. 0 mSvy-1 and 0.29 x 10-3 respectively. It is suggested that there should be an immediate monitoring and regulatory action by the relevant radiation protection authorities.


Agbalagba, O. E. and Meindinyo, R. K. (2010). Radiological impact of oil spilled environment: A case study of the Eriemu well 13 and 19 oil spillage in Ughelli region of Delta State, Nigeria.     

ClueBot, N. G. (2016). Environmental radioactivity: Background level in Soils. Wikipedia, the free encyclopedia https:/ 11/3/16.                                                

Ebong, I.D.U., and Alagoa K.D. (1992). Fertilizer impact in lonization Radiation Background at a Production Plant. Nig Journal of Physics Vol. 4, 143-149.

ICRP (1977). International Commission on Radiological Protection. Publication 26. Recommendation of ICRP. Images for Geological map of Delta State. Assessed 12/3/16                       

Mangset, W. E., Ike, E. E., Christopher, L. D., Solomon, A. O. and Mallam, S. P (2014). Evaluation of Radiation Hazard Indices and Excess Lifetime cancer Risk due to natural Radioactivity in Ground Water in Mining Areas of Plateau State. International Journal of Engineering and Applied Sciences, 5.5: 9-23        

Mokobia, C. E, and Balogun, F. A. (2004). Background gamma terrestrial dose rate in Nigeria   functional coal mines. Oxford university press.

Mokobia, C. E.  Aniku, T. and Avwiri, G. (2016). Evaluating the Radiological Health   Compliance of Some Beach Environments in Delta State. Journal of Applied Science and Environment Management, 20.3: 513-519.         

NCRP (1987). National Council on Radiation Protection and Measurements. Ionizing Radiation Exposure of the population of the United States. NCRP Report 93: Bethesda, Maryland  NEI (2016): Nuclear Energy Institute. Food and Agriculture Washington.

Oritse, G., and Bivbera, G. (2010). Nairaland Forum. Radioactive Toxic Waste Dumped in Nigeria Again – Science/Technology. Accessed 19/2/16

Pashazadeh, A. M. Aghajani, M., and Assadi, M. (2014). Annual effective dose from   environmental gamma radiation in Bushehr city. Journal of Environmental Health Science and Engineering. PubMed Central pmc385667. Accessed 19/2/16.        

The Sun (2011). The Sun Newspaper. ‘Koko toxic waste: Indigenes still live with nightmare 27 years after’. sunnews Accessed 19/2/16.        

UNSCEAR (1962). United Nations Scientific Committee on the Effects of Atomic Radiation. Radiation from Natural Sources. Annex

UNSCEAR (2010). United Nations Scientific Committee on the Effects of Atomic Radiation. Sources and effects of ionizing radiation. Report vol 1. Dose Assessment methodologies.