Assessment of Radionuclide Pollution of Medicinal Vegetable Raw Materials of the Voronezh Region on the Example of Flowers of Pizhma Ordinary
The Voronezh region traditionally is the most important region of crop production and agriculture. A research objective was the study of pollution by natural and artificial radionuclides of medicinal vegetable raw materials in the Voronezh region on flowers of a tansy ordinary, collected across all territory of the area in urbo-and the agroecosystems which are affected by various anthropogenic influence. By carrying out research in 36 samples of medicinal vegetable raw materials and the top layers of soils on which plants grew, the activity of artificial and natural radionuclides (strontium-90, caesium-137, potassium-40, thorium-232, radium-226) was defined. All samples meet the available requirements of standard documentation on activity of radionuclides. To estimate the accumulation of radionuclides from soils flowers of a tansy ordinary were used to measure the accumulation coefficients. The average value of coefficient of accumulation of strontium-90 was 0.59, in different samples of area it varied from 0.47 to 0.70. Coefficients of accumulation of caesium-137 fluctuated from 0.55 to 0.94 at an average 0.70. For thorium-232 the average coefficient of accumulation in flowers of a tansy ordinary is 0.17 and values in the studied samples ranged from 0.11 to 0.23. For potassium-40 the average coefficient of accumulation in raw materials was 0.90 and varied from 0.72 up to 1.15, and for radium-226 – 0.46 with a variation from 0.38 to 0.68. Thus, most in flowers of a tansy ordinary caesium-137 and potassium-40 collect. By the extent of accumulation of this or that radionuclide in vegetable raw materials of a tansy ordinary it is possible to judge the content of radionuclides in the soil.
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