INVESTIGATION OF THE INTERACTION OF MICROMITISTS WITH FUEL PARTICLES

 

T.I. Tugay^1,2, V.O. Zheltonozhsky³, MV Zheltonozhskaya³, AV Tugay^1,2, LV Sadovnikov³

 

¹Open International University of Human Development "Ukraine", Kyiv, Ukraine

²Institute of Microbiology and Virology named after. D. K. Zabolotniy of the National Academy of Sciences of Ukraine, Kiev, Ukraine

³Institute of Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

 

Experiments were carried out with Cladosporium cladosporium 4061, Penicillium hirsutum, Hormoconis resinae 61 and Cladosporium cladosporioides 4 micromycetes strains and two fuel particles in which a significant activity of ²⁴¹Am and plutonium isotopes was present. For the first time it was discovered that the aforementioned strains of micromycetes transfer ²⁴¹Am and isotopes of Pu from bound solid-fuel particles into biologically accessible forms.

The accumulation of ²⁴¹Аm in all strains is assential higher than the accumulation of ¹³⁷Cs and in the C. cladosporium strains, the accumulation of Am and Pu is an order of magnitude higher than the accumulation of ¹³⁷Cs. The activity of ²⁴¹Am and Pu isotopes in C. cladosporioides micronutrients is two orders of magnitude higher than their activity in the culture medium, and remains comparable to other strains. In the analysis of β-spectra, no significant accumulation of ⁹⁰Sr was detected in the mycelium of the studied micromycetes strains nor in their cultural medium.

The accumulated activity of ¹³⁷Cs, ¹⁵⁴Eu, ²⁴¹Am and Pu isotopes per g biomass and the coefficients of transition of radionuclides in the "hot" particle - micromycetes system were calculated.

The obtained results indicate the presence of radiotropism for all studied micromycetes strains. However, for strains of micromycetes C. cladosporioides processes occur on an orderly basis more effectively. Mycelium, in which the bulk of digested ²⁴¹Am is found and the Pu isotopes become biologically available for the further inclusion of ²⁴¹Am and the isotopes of Pu in a chain of soil, a plant.