Accounting of the dispersed composition of inhaled fraction and the regularities of aerosol's accumulation in various deposits of the respiratory tract when calculating doses of internal irradiation

Abstract

Purpose. The objective of the study was to establish by means of probabilistic simulation the radiation dose formation in connection with the probability of the transition of aerosol particles from the inhaled air to various sections of the respiratory tract.

Methods. The radiological inhalation model of the International Commission on Radiological Protection was modified taking into account the probability of the transition of aerosol particles from the inhaled air to different sections of the human respiratory tract. The computer code RADRISK was modified by the authors on the basis of the above mentioned inhalation model. Dependence of inhalation dose with the distribution of aerosol particles sizes was derived from probabilistic simulation with the use of code RADRISK.

Application field of research. Realistic forecast of radiological consequences to population in case of radiological accidents at nuclear power facilities. Conclusion. The paper presents a methodical approach and a mathematical apparatus that takes into account the susceptibility of different parts of the human respiratory tract to different particle sizes accumulation of the radioactive aerosol release. To take into account the probability of the transition of aerosol particles from the inhaled air to human respiratory tract during inhalation of aerosol release, a standard model of an inhalation dose was modified and introduced into the code RADRISK.