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N.Chimedtsogzol, Ts.Erkhembayar, Ts.Otgontuya, M.Baatarkhuu School of Materials Science, Mongolian University of Science and Technology, Mongolia Ash Radioactivity of the Fourth Thermal Power Plant in Ulaanbaatar City of Mongolia

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Outlines Purpose of the study Method of the study Sampling points Results Conclusion

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Introduction Thermal plants, which use coal, cause air pollution, desertification and soil erosion. Also they are producing tons of ashes per one day. TPP4 was built with assistance from the former Soviet Union and commenced operation in 1983.

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View of the Fourth Thermal Power Plant ash reservoir in Ulaanbaatar City of Mongolia.

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A high-resolution gamma spectrometer Canberra with 4096 channels and German detector Experimental method

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Methodology

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The following formula has been used to determine the specific activity of radioactive isotope within ash by using the total absorption peak Where: N(E i ) area under of total absorption peak -rays with the energy E i t measurement time, sec - detector efficiency, k - geometry factor of the detector m - sample mass, kg A- specific radioactivity, Bq/kg - gamma ray emission factor

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Sample name Isotope activity, Bq/kgElement content 226 Ra 232 Th 40 KU, / Th, / K, % 1 Ash from the stove 4 of the fourth power plant1914517415.711.00.6 2 Ash from the stove 1 of the fourth power plant2144620917.511.20.7 3 Ash from the stove 5 of the fourth power plant419.834.7562.534.48.51.9 4 Ash from the ger (national house) stove133454310.911.10.1 5 Coal from Alagtolgoi Mine494

Equivalent activity of radium, Bq/kg Gamma ray dose rate, R/h Dedication 137020Furniture, civil construction 274040Only for industry, road material 32220120 Only for construction, located far away from population and underground construction 43700200 Only for construction, located far away from population and underground construction 5>3700>200 Its not possible to use for any kind of construction. Mongolian standard of ash volume in construction materials

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Equivalent activity of Radium

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CONCLUSION 1. Ash radioactivity depends on coal content and burning temperature. 2. Equivalent activity of radium from the stove 5 was higher than acceptable level of furniture and civil construction. But Its possible to use for industry and road material. 3. It needs more control of ash samples usage for building materials.

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Thank you for your kind attention