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measurement of radioactivity in coal mining areas 1

The 226Ra, 232Th and 40K activity concentrations in coal before extraction were 18.5 - 0.5, 29.5 - 1.2 and 149.0 - 8.4 Bq kg -1, respectively. These concentrations were reduced to 18-22 after extraction due to the clay removal of the coal ore. The activity contents of the water and soil samples collected from the surrounding area ...