International Journal of Engineering and Information Systems (IJEAIS)   Year: 2019 | Volume: 3 | Issue: 12 | Page No.: 7-10 Method of Determining and Assessment of Radon Exhalation Characteristics in Technogenic Objects Jurakulov A.R., Muzafarov A.M., Urunov I.A., Allaberganova G.M., Husanov.Z.J., Abdirakhmonov U.Sh Abstract: This article presents the methods of determining radon exhalation and the results of assessment the characteristics of radon in technogenic objects. Studies conducted in recent years show that radon in terms of contribution to the total annual dose of radiation creates 20 times more contribution than the rest of the radionuclides of the uranium decay chain. Radon simultaneously belongs to the highest group A toxicity. For workers of category A (personnel), the values RAP and DKa of 222Rn (without decay products) are equal to 146 MBq / year and 55.5 Bq / l, respectively. Radon accounts for more than 75% of the total annual dose of radiation, which on average receives the human body from technogenic factors of the environment, especially those working in the uranium technogenic objects.