ASSESSING THE CONTRIBUTION OF ARTIFICIAL RADIONUCLIDES IN THE FORM OF MICROPARTICLES TO THE TOTAL RADIOACTIVITY OF BOTTOM SEDIMENT SAMPLES FROM THE YENISEI RIVER

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Abstract

The study reveals the presence of microparticles with increased activity concentrations of artificial radionuclides (60Co, 137Cs, 154Eu, and 241Am) in bottom sediments (BS) of the Yenisei River in the area affected by the operation of the Mining-and-Chemical Combine of Rosatom. In the present work, for the first time, radioactive microparticles were detected in the BS collected from three sections of the River while about 25 years ago, microparticles were only found in one section of the River. According to their radionuclide composition, the microparticles are divided into two groups: mononucleic and polynucleic microparticles. The contribution of radionuclides 137Cs, 154Eu, and 60Co contained in the microparticles to the total BS activity varies from 81 to 95%, exceeding the values previously reported for microparticles in floodplain soil and BS. 241Am is included in both groups of microparticles, exhibiting the highest contribution of activity in the form of Am-microparticles to the total activity in BS from all study areas – up to 99.6%. The presence of microparticles in the Yenisei River floodplain increases the non-uniformity of radionuclide distribution over the area, which makes it difficult to assess the total radionuclide contamination level in the River floodplain and the mobility of radionuclides in the ecosystem.

About the authors

A. Ya Bolsunovsky

Institute of Biophysics, Federal Research Center "Krasnoyarsk Science Center", Siberian Branch of the Russian Academy of Sciences

Email: radecol@ibp.ru
Krasnoyarsk, Russia

D. V Dementyev

Institute of Biophysics, Federal Research Center "Krasnoyarsk Science Center", Siberian Branch of the Russian Academy of Sciences

Krasnoyarsk, Russia

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