[en] A possibility of integral estimation of insulating properties of protection equipment (based on Petryanov cloth) for upper respiratory tract in conditions of its application in 30-km Exclusion Zone ('Ukryttia' Object and State Specialized Plant 'Complex') through hemato-immune system parameters are discussed. As a result of researches, the attributes of adaptive potential decrease,especially for the workers of Ukrytie Activity Suppression Shop and SSP Complex' Equipment and Vehicles Decontamination Department, are detected. They indicate to a high risk of radionuclide inhalations,throw discredit upon sufficient reliability of protective properties of applicable respirators,and enforce checking the correctness of this conclusion for adequate model systems