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TERI Information Digest on Energy and Environment
Year : 2002, Volume : 1, Issue : 1
First page : ( 109) Last page : ( 109)
Print ISSN : 0972-6721.

Power sector and environment

 


[138]Radiological impact from atmospheric releases of 226Ra from coal-fired thermal power plants
Vijayan V. 2001Coal contains naturally occurring radionuclides arising from U and Th series and 40K. Therefore, coal is one of the major sources of technologically enhanced exposure to man from natural radionuclides. Gaseous and particulate emissions from coal-fired thermal power plant contain radioisotopes, such as 226Ra, which are discharged to the environment causing radiation exposure to the population. In order to assess radiological impact of the thermal power plant, the measurements were carried out using a gamma-ray spectrometer for estimating the natural radionuclides in fly ash from thermal power plants at Angul and Talcher in India. It is estimated that on an average about 1012 MBq of 226Ra per GW per year is discharged to the atmosphere from these two power plants. The collective effective dose equivalent commitment to lung tissues per unit power generated due to atmospheric release of 226Ra from coal-fired power plant at Talcher and Angul was 5.1 and 4.1 (in 10­3 man Sv/GW/ year), respectively which was 7.3 and 5.9 times higher than that reported in UNSCEAR (1988) to a modern type coal-fired power plant. This was due to the higher 226Ra activity discharged per unit power produced.
(1 table, 8 references)
Indian Journal of Environmental Protection21(5):425–427
Institute of Physics,
Bhubaneswar- 751 005, India

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[139]An empirical correlation between carbon content and particle characteristics of fly ash
Sarkar A, Rano R, Bhattacharya S, Karmaker NC, Sinha IN. 2001Investigations on the relationship between particle size and carbon content of fly ash from two thermal power plants in Bihar reveal that carbon contents are rather high for coarser particles. It has been observed that though sources are different, first two size fractions (in descending order of particle size) in both the cases have a very high carbon content. The carbon content rapidly declines from the third fraction onwards. Another interesting observation is that, irrespective of the coal source, there exists a one-to-one correspondence between the size fraction and the carbon content. The particle size distributions, however, have shown marked variation depending on the source of coal. Contribution towards 'g' - a term denoting the quality of ash carried off by flue gas per kg of fuel burnt for different fractions of fly ash - is - also discussed.
(5 figures, 2 tables, 4 references)
Indian Journal of Environmental Protection21(5):392–397
Indian School of Mines,
Department of Applied Chemistry, Dhanbad - 826 004, India

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