Radiological risk assessment of 238U, 232TH and 40K in the top soils of ahero paddy fields of Kisumu county, Kenya
Abstract
A radiological risk assessment of 238U, 232Th and 40K in the top soils of Ahero paddy fields of Kisumu County has been measured using NaI(TI) gamma ray spectroscopy. A total of 17 samples were collected at a depth of 15 - 20 cm and measured for activity concentrations of three radionuclides which were used to calculate the absorbed dose rates and Annual effective dose rates of the samples. Samples were collected from fields at various stages of farming process i.e. four (4) weeks after transplanting (field 1), during transplanting (field 2), after harvesting and land ploughed (field 3) and a control field (field 4) where rice farming had not been done for 2 years. .The average activity concentrations for the three radionuclides for field 1 were 32.63 3 Bq/kg for 238U, 104.69 Bq/kg for 232Th and 75.00 Bq/kg for 40K. The average activity concentrations of the radionuclides from field 2 were 16.97 68.03 Bq/kg and 70.31 Bq/kg for 238U, 232Th and 40K respectively. The average activity concentrations of the radionuclides from field 3 (post harvesting) were 28.92 Bq/kg, 91.73 and 122.60 Bq/kg for 238U, 232Th and 40K respectively. The average activity concentrations of the radionuclides were 29.74 Bq/kg, 121.11 Bq/kg and 87.51 Bq/kg for 238U, 232Th and 40K respectively. The average Absorbed Dose Rates were 81.5 nGy/h for field 1, 52.59 nGy/h for field 2; 74.68 nGy/h for field 3 and 91.79 nGy/h for field 4. The values were below the permissible limit of 1500 nGy/h, thus the radiological risk associated with the top soils of the Ahero Paddy fields of Kisumu County, Kenya is insignificant.
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Ugbede, F. O., & Akpolile, A. F. (2019). Determination of specific activity of 238U, 232Th and 40K and radiological hazard assessment of Tuomo River Sediments in Burutu, Delta State, Nigeria. Journal of Applied Sciences and Environmental Management, 23(4), 727-733.
Vanmarcke, H. (2002). UNSCEAR 2000: sources of ionizing radiation. Annalen van de Belgische vereniging voor stralingsbescherming, 27(2), 41-65.
Kebwaro, M. J. (2009). GAMMA Ray Spectrometric Analysis of Surface Soils Around Mrima Hill, Kenya, Using NaI (Tl) Detector and Decomposition Technique.
Pulhani, V. A., Dafauti, S., Hegde, A. G., Sharma, R. M., & Mishra, U. C. (2005). Uptake and distribution of natural radioactivity in wheat plants from soil. Journal of environmental radioactivity, 79(3), 331-346.
Atwood, D. A. (Ed.). (2013). Radionuclides in the Environment. John Wiley & Sons.
Dinh Chau, N., Dulinski, M., Jodlowski, P., Nowak, J., Rozanski, K., Sleziak, M., & Wachniew, P. (2011). Natural radioactivity in groundwater–a review. Isotopes in Environmental and Health Studies, 47(4), 415-4.
Yu, K. N., & Mao, S. Y. (1999). Assessment of radionuclide contents in food in Hong Kong. Health physics, 77(6), 686–696. https://doi.org/10.1097/00004032-199912000-00013
Dance, D. R., Young, K. C., & Van Engen, R. E. (2010). Estimation of mean glandular dose for breast tomosynthesis: factors for use with the UK, European and IAEA breast dosimetry protocols. Physics in Medicine & Biology, 56(2), 453.
Alrefae, T., & Nageswaran, T. N. (2013). Radioactivity of long lived gamma emitters in rice consumed in Kuwait. Journal of the Association of Arab Universities for Basic and Applied Sciences, 13(1), 24-27.
Ugbede, F. O. (2020). Distribution of 40K, 238U and 232Th and associated radiological risks in River sand sediments across Enugu East, Nigeria. Environmental Nanotechnology, Monitoring & Management, 14, 100317.
Ugbede, F. O., Osahon, O. D., & Akpolile, A. F. (2021). Natural radioactivity levels of 238U, United Nations Scientific Committee on the Effects of Atomic Radiation. (1996). Sources and effects of ionizing radiation. UNSCEAR 1996 report to the General Assembly, with scientific annex.
Njenga, L. W. Department/unit: Department of Chemistry. Exchange, 70(252,000.00), 70-000.
Nwankwo, C. U., Ogundare, F. O., & Folley, D. E. (2015). Radioactivity concentration variation with depth and assessment of workers' doses in selected mining sites. Journal of Radiation Research and Applied Sciences, 8(2), 216-220
Kapanadze, K., Magalashvili, A., & Imnadze, P. (2019). Distribution of natural radionuclides in the soils and assessment of radiation hazards in the Khrami Late Variscan crystal massif (Georgia). Heliyon, 5(3), e01377.
Jibiri, N. N., Alausa, S. K., & Farai, I. P. (2009). Assessment of external and internal doses due to farming in high background radiation areas in old tin mining localities in Jos-plateau, Nigeria. Radioprotection, 44(2), 139-151.
Gad, A., Saleh, A., & Khalifa, M. (2019). Assessment of natural radionuclides and related occupational risk in agricultural soil, southeastern Nile Delta, Egypt. Arabian Journal of Geosciences, 12(6), 1-15.
United Nations Scientific Committee on the Effects of Atomic Radiation. (2017). Sources, Effects and Risks of Ionizing Radiation, United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2016 Report: Report to the General Assembly, with Scientific Annexes. United Nations.
Rehani, M. M., Gupta, R., Bartling, S., Sharp, G. C., Pauwels, R., Berris, T., & Boone, J. M. (2015). ICRP publication 129: Radiological protection in cone beam computed tomography (CBCT). Annals of the ICRP, 44(1), 7-127.
Villoing, D., Marcatili, S., Garcia, M. P., & Bardiès, M. (2017). Internal dosimetry with the Monte Carlo code GATE: validation using the ICRP/ICRU female reference computational model. Physics in Medicine & Biology, 62(5), 1885.
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