Abstract
The behavior of naturally-occurring radionuclides 238U, 226Ra, 210Pb, 228Ra ( 232Th) and 40K in lignites and fly ashes is described. The concentrations of 238U, 226Ra and 210Pb in lignites were increased with decreasing concentrations of 40K, resulting in an inverse relationship, whereas the concentration of 228Ra ( 232Th) increased with an increasing concentration of 40K. In fly ashes, 238U and 210Pb were enriched on smaller particles, while 40K decreased. The content of the two isotopes of radium, 226Ra and 228Ra, also decreased in finer particles of fly ash but the rate of decrease for 226Ra was found to be weaker than on the corresponding one of 228Ra as well as of 40K. The above observations are discussed.
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