NATURAL AND TECHNOGENIC RADIONUCLIDES IN THE DUDERHOF HEIGHTS LANDSCAPE

Ivanov Evgeny Dmitrievich

As a result of analyses of soil samples and samples of dry fungi fruit bodies carried out by gamma-spectrometry and beta-radiometry, it was found that that the total activity of beta-emitting radionuclides in the Dudergof Heights landscape (Saint-Petersburg and Leningrad Region) is due to the natural isotope potassium-40. The contribution of caesium-137 to the total activity is insignificant, and it is confined only in the upper part of the soil profile to a depth of 15 cm. Isotopes of radium-226 and thorium-232 have been identified, and the distribution of the latter is uniform. The total activity of beta-emitting radionuclides in the fruiting bodies of fungi is also caused by potassium-40, and the accumulation coefficients on sod-carbonate soil are 1,5 – 2,0 times lower than on sod-podzolic soil, due to its acid-base properties.

Keywords:Duderhof Heights, landscape, natural and technogenic radionuclides, fungal fruiting bodies, accumulation