The Solution of Problems of Practical Dosimetry of Complex Gas-Aerosol Radioactive Mixtures in the Context of Emergency Response
Volatile compounds of different radionuclides (like ruthenium, uranium, iodine) are referred to gas-aerosol mixtures. Separate measurement of volumetric activity of gas and aerosol fractions of such compounds is required for correct inhalation intake assessment. Lack of important experimental data leads to using assumptions regarding the particle-size distribution of aerosol fraction and the ratio between gas and aerosol fractions of gas-aerosol mixtures in the analysis of radiation accidents and for conducting a retrospective dose assessment of internal exposure because there are no mobile devices for rapid measurements of the above-mentioned parameters of inhalation intake. Purpose of current paper is to present the method developed for transformation of gas fraction of gasaerosol mixtures to aerosol fraction for separate volumetric activity measurement of gas and of the aerosol fractions with simultaneous measurement of particle-size distribution. Such method provides a more correct assessment of inhalation intake and decreases uncertainty of the internal dose estimation.