Parameters of 137 Cs Migration into the Bottom Sediments of Various Water Bodies as a Result of Phragmites australis and Typha angustifolia Dying Away

Abstract

The role of helophytes in <sup>137</sup>Cs migration into various components of aquatic ecosystems of different types was investigated. It has been found that 74-87% of <sup>137</sup>Cs total storage in the phytomass was registered in the underground organs of <i>Phragmites australis</i> and 61-86% - in the underground organs of <i.Typha angustifolia</i>. As a result of dying away of the aboveground organs of helophytes, 5-11% of <sup>137</sup>Cs total content in the phytomass can income into the water due to the release of the exchanged forms of the radionuclide. In this case, 8-31% of <sup>137</sup>Cs will remain in the detritus. Annually as a result of dying away of the above-ground and underground organs of helophytes, 53-85% of <sup>137</sup>Cs accumulated in the phytomass incomes into the bottom sediments. In this case, 9-19% of <sup>137</sup>Cs remains in the wintering rhizomes. The activity of <sup>137</sup>Cs accumulated in helophytes is not more than 6% of its content in bottom sediments occupied by plant communities. After helophytes dying away, secondary contamination of the water with <sup>137</sup>Cs can attain 0.4% of its activity in bottom sediments occupied by plant communities, about 1.1% can income into the detritus, and 4.2% - into the bottom sediments.

Assessment of the radiation exposure dose in air-water plants of various water body types in Polissia

“…Відповідно, умови опромінення підземних, підводних та надводних органів кардинально відрізняються. Крім того, за даними [16, 21] не враховано неоднорідність середовища існування рослин, ослаблення γ-випромінення водними масами та встановлено [30] закономірність щодо різних рівнів радіонуклідного забруднення надземних та підземних органів повітряно-водяних рослин.…”