V. Ye. Khan, O. S. Lagunenko, V. O. Krasnov, O. O. Odintsov, O. K. Kalynovskyi, V. M. Bezmylov, V. O. Kashpur, P. V. Sabenin, O. A. Svirid, A. V. Tkach
Institute for Safety Problems of Nuclear Power Plants, NAS of Ukraine, 36a, Kirova st., Chornobyl, 07270, Ukraine
DOI: doi.org/10.31717/2311-8253.24.1.6
Abstract
Radionuclide composition, volumetric activities (VA) and dispersity of aerosols sampled in 2019–2023 in room 304/3 of the Shelter object, where lava-like fuel-containing materials (LFCM) penetrated after the accident, are presented. The availability of transuranium elements in radionuclide composition of aerosols in room 304/3 in ratios close to those in LFCM shows that the aerosol content continues growing as result of lava degradation. The carriers of radioactive products of accident are, as a rule, aerosols with the activity median aerodynamic diameter larger than 1 μm. It evidences their dispersion origin. Substantial enrichment of aerosols in room 304/3 by 137Cs and 90Sr, relatively to lava composition, indicate the presence of at least two sources influencing radionuclide composition of aerosols. It is confirmed by the values
of parameters of disperse composition of aerosol.
Keywords: New Safe Confinement, Shelter object, lava-like fuel-containing materials, aerosols, volumetric activity, activity median aerodynamic diameter, dispersity
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