Main achievements, problems and the ways of resolving them for internal thyroid dose reconstruction as a result of the Chernobyl accident

It has been described the results of thyroid dose reconstruction for inhabitants of the Republic of Belarus. 1. About 130,000 individual thyroid dose estimates for inhabitants from 900 settlements have been done on the basis of the measurements of human thyroidal 131I content. 2. As a result of passportization of above mentioned 900 settlements it is possible to estimate individual thyroid doses additionally for 160,000 rural residents and 2,500,000 urban residents from cities: Minsk, Gomel, Mogilev, and Mozyr. 3. On the basis of the relationship obtained between the arithmetic mean thyroid dose for adults and the radionuclide deposition density in settlements the method has been developed to estimate thyroid doses for any inhabitant of the Republic if there is the data of radionuclide deposition density. 4. It has been considered the main thesis of the developed semiempirical model for thyroid dose formation as a result of the Chernobyl accident. In the simplest way it has been formulated. 5. The main approaches to get the most adequate individual thyroid dose estimated according to variants 2 and 3, including approaches with using data of deposition density of 129I, 131I, 137Cs have been formulated. 6. It has been presented the results of assessment (according to the model accepted by UNSCEAR) of additional number of the cancer cases among the population of the Republic of Belarus versus the observed number of the cancer cases. (J.P.N.)