Assessment of radioactivity of 226Ra, 232Th and 40K in soil and plants for estimation of transfer factors and effective dose around Mkuju river Project, Tanzania
F. Banzi1, P. Msaki1, N. Mohammed1
1Physics Department, University of Dar es Salaam, Dar es Salaam, Tanzania
Min. miner. depos. 2017, 11(3):93-100
https://doi.org/10.15407/mining11.03.093
Full text (PDF)
ABSTRACT
Purpose.To establish pre-mining indicators to assess radiological impact as a result of release of radionuclides to environment during uranium mining at Mkuju River Project radioactivity of 226Ra, 232Th and 40K in soil, plants, fruits and cereals.
Methods. The High Purity Germanium detector was used to determine the radioactivity and the data were subsequently used to establish soil to plant transfer factors and annual effective dose.
Findings. The results revealed a strong positive correlation (r) of 0.947 and 0.950 for 226Ra and 232Th, respectively, between values determined in soils and plants. Implicit in these finding is that the distribution of radionuclides in soils is directly proportional to the corresponding radionuclides in plants.
Originality.The roots of wild grass had the highest specific radioactivity (Bqkg-1) for 226 Ra (2.15 ± 0.02), 232Th (1.43 ± 0.02) and 40K (198.16 ± 1.72) and the roots of cabbage had the highest values for 226Ra (1.38 ± 0.04), 232Th (1.34 ± 0.03) and 40K (146.12 ± 1.02) among the food crops, an indication of a higher ability to uptake radionuclides from soil. Similarly, since the TFs were found higher in wild grass for 226Ra (0.0533 ± 0.04), 232Th (0.0374 ± 0.002) and 40K (0.5297 ± 0.05) and cabbage for 226Ra (0.0362 ± 0.03), 232Th (0.0360 ± 0.001) and 40K (0.4173 ± 0.05).
Practical implications. It is an evident that these plants can serve as good bio indicators to assess release of radionuclides from inside the mining site to the public domain. Moreover, the annual effective dose (mSvy-1) for 40K (0.23 ± 0.02), 226Ra (0.046±0.004) and 232Th (0.073 ± 0.006) in edible crops when consumed in the vicinity of the MRP before the mining operations were, as expected, insignificant.
Keywords: radioactivity, transfer factors, effective dose, Mkuju River, Tanzania
REFERENCES
Ababneh, A.M., Masa’deh, M.S., Ababneh, Z.Q., Awawdeh, M.A., & Alyassin, A.M. (2009). Radioactivity Concentrations in Soil and Vegetables from the Northern Jordan Rift Valley and the Corresponding Dose Estimates. Radiation Protection Dosimetry, 134(1), 30-37.
https://doi.org/10.1093/rpd/ncp064
Adriano, D.C., Doswell, A.C., Ciravolo, T.G., Pinder, III. J., & McLeod, K.W. (2000). Radionuclide Content of Selected Root Vegetables as Influenced by Culinary Preparation. Journal of Environmental Radioactivity, 49(3), 307-317.
https://doi.org/10.1016/s0265-931x(99)00116-2
Ahmedali, S.T. (1989). X-ray Fluorescence Analysis in Geological Sciences. Advance Methodology. Geological Association of Canada Short Course, (7).
https://doi.org/10.1017/s0016756800015259
Baeza, A., Barandica, J., Paniagua, J.M., Rufo, M., & Sterling, A. (1999). Using 226Ra/228Ra Disequilibrium to Determine the Residence Half-Lives of Radium in Vegetation Compartments. Journal of Environmental Radioactivity, 43(3), 291-304.
https://doi.org/10.1016/s0265-931x(98)00047-2
Baker, A., McGrath, S., Reeves, R., & Smith, J. (1999). Metal Hyperaccumulator Plants. A Review of the Ecology and Physiology of a Biological Resource for Phytoremediation of Metal-Polluted Soil. Phytoremediation of Contaminated Soil and Water, 85-108.
https://doi.org/10.1201/9781439822654.ch5
Banzi, F.P., Msaki, P.K., & Mohammed, N.K. (2015). Distribution of Heavy Metals in Soils in the Vicinity of the Proposed Mkuju Uranium Mine in Tanzania. Environment and Pollution, 4(3), 42-50.
https://doi.org/10.5539/ep.v4n3p42
Basu, P., Sarangapani, R., Sivasubramanian, K., & Venkatraman, B. (2015). Estimation of Annual Effective Dose Rate due to the Ingestion of the Primordial Radionuclide 40K for the Population around the Kalpakkam Nuclear Site, Tamil Nadu, India. Radiation Protection and Environment, 38(1), 14-22.
https://doi.org/10.4103/0972-0464.162827
Bersimbaev, R.I., & Bulgakova, O. (2015). The Health Effects of Radon and Uranium on the Population of Kazakhstan. Genes and Environment, 37(1).
https://doi.org/10.1186/s41021-015-0019-3
Bruzzi, L., Baroni, M., Mele, R., & Nanni, E. (1997). Proposal for a Method of Certification of Natural Radioactivity in Building Materials. Journal of Radiological Protection, 17(2), 85-94.
https://doi.org/10.1088/0952-4746/17/2/005
Canet, A., &Jacquemn, R., (1990). Methods for Measuring Radium Isotopes. Gamma Spectrometry the Environmental Behavior of Radium. IAEA Technical Report, (1), 189-204.
Chakraborty, S.R., Azim, R., Rahman, A.K.M.R., & Sarker, R. (2013). Radioactivity Concentrations in Soil and Transfer Factors of Radionuclides from Soil to Grass and Plants in the Chittagong City of Bangladesh. Journal of Physical Science, 24(1), 95-113.
Cochrane, N., & D’Souza, A. (2015). Measuring Access to Food in Tanzania: A Food Basket Approach. Amber Waves, 13-24.
Eriksson, A., (1977). Direct Uptake by Vegetation of Deposited Materials. Agricultural College of Sweden: Uppsala.
Fernandes, H.M., Franklin, M.R., Veiga, L.H.S., Freitas, P., & Gomiero, L.A. (1996). Management of Uranium Mill Tailing: Geochemical Processes and Radiological Risk Assessment. Journal of Environmental Radioactivity, 30(1), 69-95.
https://doi.org/10.1016/0265-931x(95)00032-6
Gaso, M.I., Segovia, N., Cervantes, M.L., Herrera, T., Perez-Silva, E., & Acosta, E. (2000). Internal Radiation Dose from 137Cs due to the Consumption of Mushrooms from a Mexican Temperate Mixed Forest. Radiation Protection Dosimetry, 87(3), 213-216.
https://doi.org/10.1093/oxfordjournals.rpd.a033000
IAEA (International Atomic Energy Agency). (1994). Handbook of Parameter Values for Predicting of Radionuclide Transfer in Temperate Environments. Technical Report Series No. 364, Vienna.
IAEA (International Atomic Energy Agency). (2008). Quantification of Radionuclide Transfer in Terrestrial and Freshwater Environments for Radiological Assessments. Technical Reports Series No. 472, Vienna.
IAEA (International Atomic Energy Agency). (2010). Handbook of Parameter Values for the Prediction of Radionuclide Transfer in Terrestrial and Freshwater Environments. Technical Reports Series No. 472, Vienna.
ICRP (International Committee of Radiological Protection). (1996). Age Dependent Doses to Members of Public from Intake of Radionuclides: Compilation of Ingestion and Inhalation Coefficients. ICRP Publication, Elsevier Science.
ICRP (International Committee of Radiological Protection). (2012). Compendium of Dose Coefficients Based on ICRP Publication. ICRP Publication, Annals of the ICRP.
ICRP (International Committee of Radiological Protection). (2007). The 2007 Recommendations of the International Commission on Radiological Protection. ICRP Publication, Annals of the ICRP.
IUR (International Union of Radioecologists). (1994). Handbook of Parameter Values for the Prediction of Radionuclide Transfer in Temperate Environments. Technical Reports Series No. 364, Vienna.
Jagetiya, B., Sharma, A., Soni, A., & Khatik, U.K. (2014). Phytoremediation of Radionuclides: A Report on the State of the Art. Radionuclide Contamination and Remediation Through Plants, 1-31.
https://doi.org/10.1007/978-3-319-07665-2_1
Kabata-Pendias, A., & Pendias, H. (1992). Trace Elements in Soil and Plants. London: CRC Press, Taylor & Francis Group.
Kabata-Pendias, A. (2011). Trace Elements in Soils and Plants. London: CRC Press, Taylor & Francis Group.
Linsalata, P., Morse, R.S., Ford, H., Eisenbud, M., Franca, E.P., de Castro, M.B., & Carlos, M. (1989). An Assessment of Soil-to-plant Concentration Ratios for Some Natural Analogues of the Transuranic Elements. Health Physics, 56(1), 33-46.
https://doi.org/10.1097/00004032-198901000-00003
Manigandan, P.K., & Manikandan, N.M. (2008). Migration of Radionuclide in Soil and Plants in the Western Ghats Environment. Iranian Journal of Radiation Research, 6(1), 7-12.
Mohammed, N.K., & Mazunga, M.S. (2013). Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit. International Journal of Analytical Chemistry, 1-4.
https://doi.org/10.1155/2013/501856
Mortvedt, J.J. (1994). Plant and Soil Relationships of Uranium and Thorium Decay Series Radionuclides a Review. Journal of Environment Quality, 23(4), 643-650.
https://doi.org/10.2134/jeq1994.00472425002300040004x
MSL (Mantra Resources Limited). (2010). NI 43 – 101 Technical Report on Resources Update of the Mkuju River Project.
Ng, Y.C., Colsher, C.S., & Thompson, S.E. (1979). Transfer Factors for Assessing the Dose from Radionuclides in Agricultural Products. Livermore: Lawrence Livermore Laboratory.
Nielsen, O.J. (1981). A Literature Review on Radioactivity Transfer to Plants and Soil. Roskilde: Risø National Laboratory.
Santos, E.E., Lauria, D.C., Amaral, E.C.S., & Rochedo, E.R. (2002). Daily Ingestion of 232Th, 238U, 226Ra, 228Ra and 210Pb in Vegetables by Inhabitants of Rio de Janeiro City. Journal of Environmental Radioactivity, 62(1), 75-86.
https://doi.org/10.1016/s0265-931x(01)00152-7
Shaw, G., & Bell, J.N.B. (1994). Plants and Radionuclides. In Plants and the Chemical Elements. Biochemistry, Uptake, Tolerance and Toxicity. Weinheim: VCH.
TFCT (Tanzania Food Composition Tables). (2008). Compiled by Muhimbili University of Health and Allied Sciences (MUHAS), Dar es Salaam; Tanzania Food and Nutrition Centre (TFNC), Dar es Salaam; and the Harvard School of Public Health (HSPH), Boston, MA.
UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation Sources, Effects and Risks of Ionization Radiation). (2000). Report to the General Assembly, with Scientific Annexes B: Exposures from Natural Radiation Sources. New York.
UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation Sources, Effects and Risks of Ionization Radiation). (2013).
Attachment C-13. Methodology for the Assessment of Dose from Ingestion of Radioactive Material. UNSCEAR 2013 Report, Annex A, Levels and Effects of Radiation Exposure due to the Nuclear Accident after the 2011 Great East-Japan Earthquake and Tsunami. Appendix C. Assessment of Doses to the Public.
Whicker, F.W., Hinton, T.G., Orlandini, K.A., & Clark, S.B. (1999). Uptake of Natural and Anthropogenic Actinides in Vegetable Crops Grown on a Contaminated Lake Bed. Journal of Environmental Radioactivity, 45(1), 1-12.
https://doi.org/10.1016/s0265-931x(98)00076-9
