Characteristics of radioactive aerosols in 2014 near lavaliked fuel contained materials in premise 012/15 of the ''Ukryttya'' object

Composition, concentrations and dispersity of radioactive aerosols in 2014 in premise 012/15 of the ''Ukryttya'' object, were are existed the lavaliked fuel contained materials (LCFM) are presented. The samples were taken on Petryanov's three-layer filters. At the same time concentrations of radon, thoron and their daughter products were definition with help of the seismic radon station and of radiometer ''Alfarad plus A''. It was stated that concentration of beta-radiating (Σβ) aerosol-carriers (⁹⁰Sr+⁹⁰Y and ¹³⁷Cs) was fluctuating with the range 0.2 - 3 Bq/m³. Besides, ¹³⁷Cs share made 30 - 40 %. Ratio of ¹'3⁷Cs/²⁴¹Am concentrations was close to 150. Radionuclide carriers were aerosols with AMAD near 1 μm. Gamma-spectrometric measurements have demonstrated that ratios of radionuclides-products ChNPP Unit 4 accident in aerosol samples and LCFM specimens were characteristically different. It mean that LCFM destruction is altered slightly. Maximum volume activity of radon reached 200 - 300 Bq/m³. ²¹²Pb concentrations - thoron daughter products were fluctuating within the range 0.7 - 33 Bq/m³, and its carriers were the particles of diameter, prevailing, 0.1 - 0.3 μm