Radioactive Levels and Human Health Effects in a Dumpsite on Ulaanbaatar City, Mongolia
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 26, Issue 4
Abstract
Most of the solid waste from Ulaanbaatar city during the cold season is ash from the partial combustion of coal. Burial of the ashes with other solid wastes has affected radioactive isotope levels in the soil. We investigated levels of radionuclides 226Ra, 232Th, 40K, and 137Cs in soil samples collected from the Naran Enger landfill using a gamma-ray spectrometer. The radioactivity of naturally occurring radionuclides in the soil samples was highest underneath the buried waste zone, and lowest around the ger areas and at the initial reference location. In the buried zone, activity of 40K isotope was two times higher than the world average. The results showed that radium equivalent activity (Raeq) ranged between 69 and 183 Bq · kg−1, and the Raeq of ash was 338.3 Bq · kg−1. The external and internal hazard indexes were 0.2 and 0.5, respectively. From the Raeq, Hin, Hex, Dout, and Din values, we calculated lifetime cancer risk and found the risk to be (0.8−1.58) × 10−3. Current values of Raeq and hazard indices were found to be within the recommended limits.
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Acknowledgments
This work was supported by the Young Scientist Grant of the National University of Mongolia (Grant No. P2019-3717) with additional support from the Ministry of Education, Culture, Science and Sport, and the Mongolian Foundation for Science and Technology (SSA_2020/26).
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 26 • Issue 4 • October 2022
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© 2022 American Society of Civil Engineers.
History
Received: Jan 13, 2022
Accepted: May 22, 2022
Published online: Aug 5, 2022
Published in print: Oct 1, 2022
Discussion open until: Jan 5, 2023
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