Volume 1, Issue 2 (October 2016)

Original research papers

Radioecology

SOIL AND VEGETATION FROM NOVI PAZAR (SERBIA) AND ROŽAJE (MONTENEGRO): RADIOACTIVITY IMPACT ASSESSMENT

Ivanka Antović, Nikola Svrkota, Dalibor Stojanović, Mirzeta Hadžibrahimović, Ranka Žižić, Gordana Laštovička-Medin

Pages: 105-110

DOI: 10.21175/RadJ.2016.02.019

Received: 18 FEB 2015, Accepted: 5 JUN 2015, Published Online: 18 OCT 2016

Soil samples from Novi Pazar (Serbia) and Rožaje (Montenegro) were analyzed by the ORTEC HPGe detectors with relative efficiencies of 35 and 40 % for radioactivity of 226Ra, 232Th/228Ac, 40K and 137Cs. An average radioisotope activity concentration for Novi Pazar soil was found to be 27.6, 49.5, 585 and 14.9 Bq/kg, respectively; while in Rožaje, 137Cs activity concentration was found to be significantly higher – from 33.9 to 322 Bq/kg. The obtained results were used to estimate hazard indices, such as radium equivalent activity (none of the localities showed a radium equivalent activity higher than 370 Bq/kg) and annual gonadal dose equivalent to natural radioisotopes, as well as external terrestrial gamma absorbed dose rate of 226Ra, 232Th/228Ac, 40K and 137Cs, and corresponding annual effective dose – used to evaluate excess lifetime cancer risk (then compared with the world average of 0.2×10-3, taking into account external terrestrial radiation – outdoor, i.e., average annual effective dose of 0.07 mSv). Vegetation samples from Rožaje – blackberry (Rubus fruticosus), spruce (Picea abies) and beech (Fagus sylvatica) showed 226Ra activity – 4.03, 1.1 and 0.99 Bq/kg, respectively; 232Th/228Ac – 4.5, <1.22 and 2.89 Bq/kg, respectively; 40K – 152, 98.4 and 79.3 Bq/kg, respectively; 137Cs – 3.05, 3.54 and 5.24 Bq/kg, respectively; whilst in Pinus sylvestris from Novi Pazar, they were – 2.7, 2.11, 163, <0.34 Bq/kg, respectively. Soil-plant radioisotope transfer factors were also estimated, and compared with typical ranges given in the UNSCEAR 2008 report. Since the most important radiation source for all terrestrial biota is the activity from soil, the dose rates are also evaluated using known internal (and external – in soil) radioisotope activity concentrations, as well as corresponding the dose conversion coefficients for external and internal exposure to particular radioisotope.
  1. Official site: www.novipazar.rs (in Serbian).
  2. MONSTAT, “Statistical Yearbook of Montenegro”, Statistical Office of Montenegro, Podgorica, 2012.
  3. I.Antović,D. Stojanović, N. Svrkota, R. Žižić, M. Hadžibrahimović, “Openning radioecological research in Novi Pazar – territory of Novopazarska Banja," Proc. 27th Symposium of the Radiation Protection Society of Serbia and Montenegro, Vrnjačka Banja – Serbia, pp. 72-75, 2013. (in Serbian)
  4. P. Vukotić et al. “Background gamma-radiation in Montenegro,” Proc. IRPA Regional Symposium on Radiation Protection in Neighbouring Countries of Central Europe, Prague, Czech Republic, pp. 477-479, 1997.
  5. N. M. Antovic, N. Svrkota, I. Antovic, “Measuring 226Ra and 232Th activity in soil and vegetation samples using a method of double g-coincidences,“ J. Radioanal. Nucl. Chem., vol. 283(2), pp. 313-318, 2010.
    DOI: 10.1007/s10967-009-0376-0
  6. International Union of Radioecology, http://iur-uir.org/upload/About%20IUR/radioecology_oslo_presentation2014.pdf, 2014.
  7. HASL-300, “EML Procedures Manual”, Environmental Measurements Laboratory, U.S. Department of Energy, 28 Edition, 1997.
  8. UNSCEAR, Sources and Effects of Ionizing Radiation. Annex B: Exposure from natural radiation sources”, United Nations, New York, 2000.
  9. E. Kapdan, A. Varinlioglu, G. Karahan, “Radioactivity levels and health risks due to radionuclides in the soil of Yalova, northwestern Turkey,” Int. J. Environ. Res., vol. 5(4), pp. 837-846, 2011.
  10. H. Taskin et al. “Radionuclide concentrations in soil and lifetime cancer risk due to gamma radioactivity in Kirklareli, Turkey,” J. Environ. Radioactiv., vol. 100(1), pp. 49-53, 2009.
    DOI: 10.1016/j.jenvrad.2008.10.012
  11. ICRP Publication 60, “1990 Recommendations of the International Commission on Radiological Protection”, 21/1-3, 1991.
  12. J. Beretka, P. J. Mathew, “Natural radioactivity of Australian building materijals, industrial wastes and by-products,” Health Phys., vol. 48(1), pp. 87-95, 1985.
    DOI: 10.1097/00004032-198501000-00007
  13. W. Arafa, “Specific activities and hazards of granite samples collected from the eastern desert of Egypt,” J. Environ. Radioactiv., vol. 75(3), pp. 315-327, 2004.
    DOI: 10.1016/j.jenvrad.2004.01.004
  14. UNSCEAR, “Sources and effects of ionizing radiation. Annex E: Effects of ionizing radiation on non-human biota”, 2008 Report to the General Assembly with Scientific Annexes, United Nations, New York, 2011.
  15. B. D. Amiro, “Radiological dose conversion factors for generic non-human biota used for screening potential ecological impacts,” J. Environ. Radioactiv., vol. 35, pp. 37-51, 1997.
    DOI: 10.1016/S0265-931X(96)00028-8
  16. S. S. Nenadovic, M. T. Nenadovic, I. S. Vukanac, M. O. Omerasevic, Lj. M. Kljajevic, “Radiological hazards of 137Cs in cultivated and undisturbed areas,” Nucl. Technol. Radiat. Prot., vol. 26(2), pp. 115-118, 2011.
    DOI: 10.2298/NTRP1102115N
  17. Lj. Jankovic Mandic, S. Dragovic, “Assessment of terrestrial gamma exposure to the population of Belgrade (Serbia),” Radiat. Prot. Dosim., vol. 140(4), pp. 369-377, 2010.
    DOI: 10.1093/rpd/ncq135
  18. N. M. Antović et al., “Radioactivity impact assessment of Nikšić region in Montenegro,” J. Radioanal. Nucl. Chem., vol. 302 (2), pp. 831-836, 2014.
    DOI: 10.1007/s10967-014-3254-3
  19. N. M. Antovic, P. Vukotic, N. Svrkota, S. K. Andrukhovich, “Pu-239+240 and Cs-137 in Montenegro soil: their correlation and origin,“ J. Environ. Radioactiv., vol. 110, pp. 90-97, 2012.
    DOI: 10.1016/j.jenvrad.2012.02.001
  20. R. K. Singhal, K. Ajay, N. Usha, A. V. R. Reddy, “Evaluation of doses from ionizing radiation to non-human species at Tromay, Mumbai, India,” Radiat. Prot. Dosim., vol. 133(4), pp. 214-222, 2009.
    DOI: 10.1093/rpd/ncp048