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Assessment of external and internal doses due to farming in high background radiation areas in old tin mining localitiesin Jos-plateau, Nigeria

Published online by Cambridge University Press:  27 May 2009

N. N. Jibiri ,
S. K. Alausa  and
I. P. Farai
N. N. Jibiri
Affiliation:
Radiation and Health Physics Research Laboratory, Department of Physics, University of Ibadan, Ibadan, Nigeria.
S. K. Alausa
Affiliation:
Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria.
I. P. Farai
Affiliation:
Radiation and Health Physics Research Laboratory, Department of Physics, University of Ibadan, Ibadan, Nigeria.
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Abstract

Farming on soils situated in high background radiation areas can result to enhanced radiation exposure scenarios and pathways to humans. To assess the likely levels of exposures, farm soil samples were collected from different farmlands in three old tin mining localities (Bitsichi, Bukuru and Ropp) in Jos Plateau Nigeria, known for high radiations. The soil samples were analyzed for the activity concentrations of 226Ra, 232Th and 40K, using gamma-ray spectroscopy. The outdoor annual effective dose rates were calculated using the activity concentrations of the radionuclides and were found to vary from 0.07 mSv to 2.02 mSv across the three localities. Considering dust generation from soil tillage and inadvertent ingestion of soil particles, the likely internal radiation hazards were estimated using conservative dust and soil loading factors. The total average annual effective dose rates due to 226Ra and 232Th that could result from dust inhalation and ingestion of soil particles were 16.9 µSv, 8.1 µSv and 8.8 µSv, respectively for Bitsichi, Bukuru and Ropp. Though these values are about 5% the outdoor exposures to the farmers in those farms and greater than 1 µSv y-1, from the point of view of radiation protection and risk, they are significant. It suffices to say, therefore, that the results of this study will create the possibility of the importance to evaluate the health risk among the farming population and workplace environments which often is not covered by regulations concerning health protection.

Keywords

external doseingestion doseinhalation dosefarmingnatural radionuclidesfarm soiltin miningactivity concentrationJos PlateauNigeria
Type
Research Article
Information
Radioprotection , Volume 44 , Issue 2 , April 2009 , pp. 139 - 151
Copyright
© EDP Sciences, 2009

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References

Ademola, J.A. (2008) Exposure to high background radiation level in the tin mining area of Jos Plateau Nigeria, J. Rad. Prot. 28, 93–99. CrossRef
Alexander, M.J., Kidd, A.D. (2000) Farmer’s capability and institutional incapacity in Reclaiming disturbed land on the Jos Plateau, Nigeria, J. Environm. Manag. 59, 141–155. CrossRef
EPA (1997) Environmental Protection Agency, Exposure factors Hand Book. United States Environmental Protection Agency, National Centre for Environmental Assessment Office of Research and Development, Washington DC.
Farai I.P., Jibiri N.N. (2000) Baseline studies of terrestrial outdoor gamma dose rate levels in Nigeria, Radiat. Prot. Dosim. 88, 247–254. CrossRef
Jibiri, N.N., Agomuo, J.C. (2007) Trace elements and radioactivity measurements in some terrestrial food crops in Jos-Plateau, Northcentral, Nigeria, Radioprotection 42, 29–42. CrossRef
Jibiri, N.N., Bankole, O.S. (2006) Soil radioactivity and radiation absorbed dose rates at roadsides in high-traffic density area in Ibadan Metropolis, southwestern, Nigeria, Radiat. Prot. Dosim. 118, 453–458. CrossRef
Jibiri, N.N., Farai, I.P., Alausa, S.K. (2007a) Estimation of annual effective dose due to natural radioactive elements in ingestions of foodstuffs in tin mining area of Jos-Plateau, Nigeria. J. Environm. Radioact. 94, 31- 40. CrossRef
Jibiri, N.N., Farai, I.P., Alausa, S.K. (2007b) Activity concentrations of 226Ra, 228Th, and 40K, in different food crops from a high background radiation area in Bitsichi, Jos Plateau, Nigeria, Radiat. Environm. Biophys. 46, 53–59. CrossRef
Kissel, J.C., Shirai, J.H., Richter, Y., Fenske, R.A. (1998) Empirical investigation of hand-to-mouth transfer of soil, Bull. Environm. Contamin. Toxicol. 60, 379–386. CrossRef
Mittra B.N., Karmakar S., Swain D.K., Ghosh B.C. (2003) Fly ash- a potential source of soil amendment and a component of integrated plant nutrient supply system. International ash utilization symposium, Center for Applied Energy Research, University of Kentucky. Paper No. 28 (http://www.flyash.info).
Molocznik, A., Zagorski, J. (1998) Exposure to dust among agricultural workers, Ann. Agric. Environ. Med. 5, 127–130.
Mustapha, A.O., Mbuzukongira, P., Mangala, M.J. (2007) Occupational radiation exposures of artisans mining columbite-tantalite in the eastern Democratic Republic of Congo, J. Rad. Prot. 27, 187–195. CrossRef
Oatway W.B., Mobbs S.F. (2003) Methodology for estimating the doses to members of the public from the future use of land previously contaminated with radioactivity NRPB-W36 (Chilton: NRPB).
Obed, R.I., Farai, I.P., Jibiri, N.N. (2005) Population dose distribution due to soil radioactivity concentration levels in 18 cities across Nigeria, J. Rad. Prot. 25, 305–312. CrossRef
Oresegun, M.O., Babalola, I.A. (1990) Occupational radiation exposure associated with milling of Th‑U rich Sn in Nigeria, Health Phys. 58, 213–215.
Oresegun, M.O., Babalola, I.A. (1993) The environmental gamma radiation level of Jos, Nigeria, Niger. J. Sci. 27, 263–268.
Pasquini, M.W., Alexander, M.J. (2005) Soil fertility management strategies on the Jos Plateau: the need for integrating empirical and scientific knowledge in agricultural development, Geograph. J. 171, 112–124. CrossRef
Tegen, I., Werner, M., Harrison, S.P., Kohfeld, K.E. (2004) Relative importance of climate and land use in determining present and future global soil dust emission, Geophys. Res. Lett. 31, L05105, DOI: 10.1029/GLO.1912.
UNSCEAR (2000) United Nations Scientific Committee on the effects of Atomic Radiation, Report to the General Assembly, New York: United Nations.
Yu C., Loureiro C., Cheng J.J., Jones L.G., Wang Y.Y., Chia Y.P., Faillace E. (1993) Data collection handbook to support modeling impacts of radioactive material in soil. Environmental Assessment and Information Sciences Division Argonne National Laboratory, Argonne, Illinois.