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Bunzl, K.W. ; Kretner, R. ; Szeles, M.S.M.F. ; Winkler, R.A.

Transect survey of ²³⁸U, ²²⁸Ra, ²²⁶Ra, ²¹⁰Pb, ¹³⁷Cs and ⁴⁰K in an agricultural soil near an exhaust ventilating shaft of a uranium mine.

Sci. Total Environ. 149, 225-232 (1994)

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To study the effect of exhaust air from a ventilating shaft of a uranium mine on an adjacent field, we determined, along a 200-m transect in 4-m intervals, the activity concentrations of the natural radionuclides ²³⁸U, ²²⁸Ra, ²²⁶Ra, ²¹⁰Pb, and ⁴⁰K as well as the artificial fallout radionuclide ¹³⁷Cs in the soil. Data showed that increased activity concentrations, due to the emissions from the mine, are observable for all radionuclides with the exception of ⁴⁰K at up to a distance of about 40 m in the field (i.e. 50 m from the air outlet). The largest effect was observed for ²¹⁰Pb (an increase by one order of magnitude) and the smallest was for ²²⁸R. The increased levels of ¹³⁷Cs in the soil near the ventilating shaft were not the result of ¹³⁷Cs in the rock material of the mine, but this radionuclide arrived in the air of the mine via the main fresh airways and was consequently also found in the exhausted air. The semivariograms of the activity concentrations of the radionuclides at distances where the effect of the emissions from the mine was no longer detectable indicated, for ²²⁶Ra, the presence of a range (about 30 m) within which the variance attained its maximum value (approximately the sample variance).

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