RADIONUCLIDE CONCENTRATIONS AND IMPACT ASSESSMENT OF THE JOS TIN MINING SOIL RESIDUES
Abstract
This study was performed to measure the radionuclides in the tin mining soil mounds from the Jos Plateau, Nigeria and to evaluate the impact of radiation on the environment where the soils are used as building materials. Gamma spectrometry was employed via a NaI(Tl) detector to determine the activities of the radionuclides 40K, 238U and 232Th in ten (10) samples from points within a distance of 20 km along the mining trail. The results of measurements of natural radionuclide ( 238U, 232Th and 40K) in soil samples show that the concentrations of 238U, 232Th and 40K ranged between 1.51 – 4.98, BDL - 8.64 and 10.3 – 35.2 Bq/kg with mean concentrations of 3.20 1.16, 1.31 2.75 and 25.60 8.89 Bq/kg, respectively. The external hazards ranged between 0.008 – 0.044 with mean value of 0.019 0.009 while the internal hazards ranged between 0.014 – 0.048 with mean value of 0.028 0.009. These hazard values are less than 1. The annual gonadal dose equivalent (AGDE) ranged between 10.28 – 55.87 Svy-1 with mean value of 24.22 12.16 Svy-1 . The radium equivalent activities ranged from 3.07 – 16.23 Bq/kg with a mean value of 7.04 3.53 Bq/kg. The external absorbed dose rate ranged from 5.35– 18.76 Gyh-1 with a mean value of12.95 4.26 Gyh-1 . The internal absorbed dose rate ranged from 10.34 – 35.53 Gyh-1 with an average value of 24.87 8.13 nGyh-1 . The external absorbed dose equivalent rate ranged from 0.007- 0.023 with a mean value of0.016 . The internal absorbed dose equivalent rate ranged from 0.051 – 0.174 with an average value of 0.122 . All the calculated radiological indices fall within the recommended safe limits and world averages. The soil mounds, therefore, do not constitute environmental radiation risks and the soils could be used in construction.References
References
R. J. Hyde, The Jos Plateau: A field Course
Handbook, Ahmadu Bello University, Zaria (1986).
T. Badejoko, Nigerian Journal of Mining and
Geology 10 (1975) 42.
I. Oshin and M.A. Rahaman, Journal of African
Earth Sciences 55 (1986) 167.
M.A. Rahaman, Publication of the Geological
Survey of Nigeria 3 (1988) 11.
W. N. Macleod and D. C. Turner, Bulletin of the
Geological Survey of Nigeria. 32, No. 2 (1971).
A. F. Calvert, Nigeria and its Tin Fields, Arno
Press, New York (1977).
M.J. Alexander, Land Degradation Development 7
(1996) 77.
M.J. Alexander and A.D. Kidd, Nigerian Journal of
Environmental Management 59 (2000) 141.
M.O. Oresegun and I.A. Babalola, Health Physics
(1990) 213.
M.O. Oresegun and I.A. Babalola, Nigerian Journal
of Science 27 (1993) 263.
A.E. Ogezi, International Conference on Energy,
Environment and Disasters-INCEED, Charlotte,
USA, July 24-30 (2005).
M.W. Pasquini and M.J. Alexander, The
Geographical Journal 171 (2005) 112.
C.R. Cothern and W.L. Lappenbusch, Health
Physics 45 (1983) 89.
I.A. Babalola, Nigerian Journal of Science 18
(1984) 98.
A.O. Sanni, D. James and E.A. Schweikert,
Nigerian Journal of Science 20 (1985) 115.
M.E. Adiukwu – Brown and A.E. Ogezi, Journal of
Environmental Sciences 4, No. 1 (2000) 35
J.A. Ademola, Journal of Radiological Protection
(2008) 93.
U.Forstner and G.T.W. Wittmann, Metal Pollution
in the Aquatic Environment, Springer – Verlag,
Berlin (1983).
S.K. Alausa, Radioactivity in farm soils and food
crops grown in Jos and Abeokuta, Nigeria and its
associated cancer risks, Unpublished Ph.D Thesis,
University of Ibadan, Nigeria (2012).
P.T. Flawn, Environmental Geology, Conservation,
Landuse Planning and Resources Management,
Harper and Row Publishers, New York (1970).
N.N. Jibiri, Application of in-situ gamma ray
spectrometry in baseline studies of outdoor
radiation exposure levels in Nigeria, Unpublished
Ph.D Thesis, University of Ibadan, Nigeria (2000).
I.P. Farai and N.N. Jibiri, Radiation Protection
Dosimetry 88 (2000) 247.
N.N. Jibiri, S.K. Alausa and I.P. Farai, International
Journal of Low Radiation 6, No. 2 (2009) 79.
N. N. Jibiri, I. P. Farai and S. K. Alausa, Journal of
Environmental Radioactivity 94 (2007) 31.
J.A. Ademola, Health Physics 94 (2008) 43.
J. Beretka and P.J. Mathew, Health Physics 48
(1985) 87.
I.Xinwei, Journal of Radioanalytical Nuclear
Chemistry 262 (2004) 775.
R. Krieger, Bentowerk Fertigteil-Techn., 47 (1981)
L. Venturini and M. B. Nisti, Radiation Protection
Dosimetry 71 (1997) 227.
I. P. Farai and J. A. Ademola, Journal
Environmental Radioactivity 79, No. 2 (2005) 119.
K. N. Yu, Z. J. Guan, M. J. Stoks and E. C. Young,
Journal of Environmental Radioactivity 17 (1992)
J.H. Zaidi, M. Arif, S. Ahmad, I. Fatima and I.H.
Qureshi, J. of Appl. Radiat. and Isot. 51, No. 5
(1999) 559.
J. Al-Jundi, W. Salah, M. S. Bawa’aneh and F.
Afaneh, Radiation Protection Dosimetry 118, No.
(2005) 93.
United Nations Scientific Committee on Effects of
Atomic Radiation (UNSCEAR), Sources and
Effects of Ionizing Radiation, New York: United
Nations 1 (2000).
S. Turhan and L. Gunduz, Journal of Radiological
Protection 99, No. 2 (2008) 332.
United Nations Scientific Committee on Effects of
Atomic Radiation (UNSCEAR), Sources and
Effects of Ionizing Radiation, New York: United
Nations (1993).
European Commission (EC), Radiation Protection
(1999).
C. Papastefanou, S. Stoulos and M. Manolopculou,
Journal of Radioanalytical and Nuclear Chemistry
, No. 3 (2005) 367.
R. Mehra, S. Singh and K. Singh, Indian Journal of
Physics 83, No. 7 (2009) 1031.
A.M. Arogunjo, V. H llriegl, A Giussani, K.
Leopold, U. Gerstmann, I. Veronese and U. Oeh,
Journal of Environmental Radioactivity 100, No. 3
(2009) 232.