CONTENT OF URANIUM ISOTOPES IN COALS OF KAZAKHSTAN

Authors

  • Sh. N. Nazarkulova Non-commercial joint-stock company “Al-Farabi Kazakh National university”
  • L. T. Asadova Non-commercial joint-stock company “Al-Farabi Kazakh National university”
  • N. A. Nursapina Non-commercial joint-stock company “Al-Farabi Kazakh National university”
  • I. V. Matveyeva Non-commercial joint-stock company “Al-Farabi Kazakh National university”
  • A. N. Gurin Non-commercial joint-stock company “Al-Farabi Kazakh National university”

Keywords:

coal, uranium isotopes, alpha-spectrometry, Karazhyra, Shubarkol, Ekibastuz

Abstract

The content of natural isotopes of uranium (uranium-238 and uranium234) is considered in the presenting paper. The samples of coals from three main coal deposits, located on the territory of Kazakhstan (Karazhyra, Shubarkol and Ekibastuz) were analyzed by alpha-spectrometric method after the corresponding chemical separation, which included separation of radionuclides by liquid-liquid extraction (30% solution of TBP in toluene) and preparation of counting sample by electrodeposition. The measurements were done at the high resolution alpha-spectrometer (Canberra, semiconductor PIPS detectors) and the Alpha Analyst program was used for processing spectra. The content of total uranium increases in the following series: coal of Karazhyra deposit < coal of Shubarkol deposit < coal of Ekibastuz deposit. The results showed that the most safety is coal from Karazhyra coal deposit (0.55±0.12 Bq/kg and 0.85±0.14 Bq/kg for uranium-238 and uranium-234, correspondently). The highest values of concentration of uranium isotopes were recorded for coals of Ekibastuz deposit, but even for it the content of uranium-238 is much lower than the average natural radionuclide activity concentrations in coal.

References

[1] Jinfeng Li, Chuangao Wang, Ziqiang Pan, Ziying Jiang, Ling Chen, Yanqi Zhang, Jingshun Pan, Chunhong Wang, Jingjing Li, Ruirui Liu. Analysis of 210Pb and 210Po emissions from coal-fired power plants // Fuel. 2018. Vol. 236. P. 278-283.
[2] Key World Energy Statistics 2017 // International Energy Agency. 2017. https://www.iea.org/publications/freepublications/publication/KeyWorld2017.pdf.
[3] I. Kursun Unver, M. Terzi. Distribution of trace elements in coal and coal fly ash and their recovery with mineral processing practices // Journal of Mining & Environment. 2018. Vol. 9. P. 641-655.
[4] Banu Ozden, Erkan Guler, Taavi Vaasma, Maria Horvath, Madis Kiisk, Tibor Kovacs. Enrichment of naturally occurring radionuclides and trace elements inYatagan and Yenikoy coalfired thermal power plants // Journal of Environmental Radioactivity. 2018. Vol. 188. P. 100-107.
[5] Dai S., Finkelman R.B. Coal as a promising source of critical elements: Progress and future prospects // International Journal of Coal Geology. 2017. Vol. 186. P. 155-164.
[6] Vaasma T., Kaasik M., Loosaar J., Kiisk M., Tkaczyk A. Long-term modelling of fly ash and radionuclide emissions as well as deposition fluxes due to the operation of large oil shale-fired power plants // Journal of Environmental Radioactivity. 2017. Vol. 244. P. 178-179.
[7] Nuccetelli C., Pontikes Y., Leonardi F., Trevisi R. New perspectives and issues arising from the introduction of (NORM) residues in building materials: a critical assessment on the radiological behavior // Constr. Build. Mater. 2015. Vol. 82. P. 323-331.
[8] Using coal ash in highway construction: a guide to benefits and impacts, EPA-530-K-05-002 U.S. // Environmental Protection Agency. 2005. https://www.epa.gov/nscep.
[9] Schwandorf H. Uranium graded coals in Europe, Glückauf magazine. 2001.
[10] Uralbekov B., Burkitbayev M., Satylbadiyev B., Matveyeva I., Tuzova T., Snow D. Spatial and temporal variability of U-234/U-238 activity rations in the Shu River, Central Asia // Environmental Earth Sciences. 2014. Vol. 9. P. 3635-3642.
[11] Burkitbayev M., Uralbekov B., Nazarkulova S., Matveyeva I., Vintro LL. Uranium series radionuclides in surface waters from the Shu river (Kazakhstan) // Journal of Enviromental Monitoring. 2012. Vol. 14(4). P. 1190-1195.

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Published

2021-05-03