PuSH - Publication Server of Helmholtz Zentrum München: Spatial distribution of radionuclides in soil around a coal-fired power plant: 210Pb, 210Po, 226Ra, 232Th, 40K emitted with the fly ash and 137Cs from the worldwide weapon testing fallout.

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Bunzl, K.W. ; Hötzl, H. ; Rosner, G. ; Winkler, R.A.

Spatial distribution of radionuclides in soil around a coal-fired power plant:²¹⁰Pb, ²¹⁰Po, ²²⁶Ra, ²³²Th, ⁴⁰K emitted with the fly ash and ¹³⁷Cs from the worldwide weapon testing fallout.

Sci. Total Environ. 38, 15-31 (1984)

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To determine the effect of airborne emissions of radionuclides from coal-fired power plants on the environment, the concentrations of the most important radionuclides were measured in soil samples from the local environments (0.4-5.2 km) as well as in fly ash. The spatial distribution of the radionuclides in the soil did not indicate any significantly increased concentrations in the area downwind of the plant compared to other areas; the ratios 210Pb/226Ra and 210Po/226Ra were within the range observed for unaffected soils. The emissions from the plant, though present, are obviously too small to significantly change the natural local distribution pattern of the radionuclides in the soil. A highly significant correlation between 40K and 232Th was observed which was independent of the different types of soils found in this area. The concentration of 137Cs in topsoil, which is the result of worldwide fallout from nuclear weapons testing, varied at some places even within a small distance (∼ 2 km) by up to one order of magnitude. Furthermore, it was observed that the concentration of 137Cs in soils from cropland was on average a factor of 2 less than in those from grassland. This variability has to be considered in planning monitoring programs around nuclear power plants, which may also release this radionuclide.

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