A method for calculation of internal irradiation due to radioactive dust and aerosols of the ChNPP ‘Shelter’ Object intake into a human body is proposed. It is shown, that despite the fact that alpha active substances bring a little contribution to total aerosol activity, it brings significant contribution into the internal irradiation. All components of the internal dose calculation are considered comprehensively. Resuspension factor on the basis of an experimental data inside ‘Shelter’ Object are given. Recommendations to correct inhalation dose calculation are made.

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