Analysis of Aerosol Distribution Inside the Object “Shelter” at the Chornobyl Nuclear Reactor Site

Abstract

Results of the aerosol sampling inside the Object Shelter at the Chornobyl nuclear reactor site are considered in the work. The results show a consistent and significant contribution of submicron fraction to the total aerosol activity. Different methods of interpretation of impactor data series are compared in order to indicate and detect in the most effective way the submicron fraction as a separate component of the distribution. The methods used are as follows-method of probabilistic-logarithmic scale, method of likelihood function, non-linear approximation by sum of several log-normal distributions, and restoration of the initial distribution using passage functions of impactor cascades. Practically all the collected data on aerosol distribution inside the Shelter show a distinct submicron component. The contribution of the submicron component into the total aerosol activity is about 35%. Influence of the actual aerosol distribution on the dose coefficients is analyzed.

Aerosol monitoring during work inside the “object shelter”: Analysis of dispersion and concentration for different work types

“…Data on aerosol distribution, radionuclide composition and concentrations of the radioactive aerosols during the works inside the OS was obtained. The data on dispersion of aerosol was analysed by number of standard methods described in [3][4][5].…”

Development, organization and implementation of the program of radiоactive aerosol monitoring using personal air samplers and impactors during the maintenance of the shelter object

“…На сьогодні встановлено [2,6], що в умовах ОУ доза внутрішнього опромінення формується переважно трансурановими елементами (ТУЕ).…”