The East Urals Radioactive Trace (EURT) was formed after a chemical explosion in the radioactive waste-storage facility of the Mayak Production Association in 1957 (Southern Urals, Russia) and resulted in an activity dispersion of 7.4?×?10(16) Bq into the atmosphere. Internal exposure due to ingestion of radionuclides with local foodstuffs was the main factor of public exposure at the EURT. The EURT cohort, combining residents of most contaminated settlements, was formed for epidemiological study at the Urals Research Center for Radiation Medicine, Russia (URCRM). For the purpose of improvement of radionuclide intake estimates for cohort members, the following data sets collected in URCRM were used: (1) Total ß-activity and radiochemical measurements of (90)Sr in local foodstuffs over all of the period of interest (1958-2011; n?=?2200), which were used for relative (90)Sr intake estimations. (2) (90)Sr measurements in human bones and whole body (n?=?338); these data were used for average (90)Sr intake derivations using an age- and gender-dependent Sr-biokinetic model. Non-strontium radionuclide intakes were evaluated on the basis of (90)Sr intake data and the radionuclide composition of contaminated foodstuffs. Validation of radionuclide intakes during the first years after the accident was first carried out using measurements of the feces ß-activity of EURT residents (n?=?148). The comparison of experimental and reconstructed values of feces ß-activity shows good agreement. (90)Sr intakes for residents of settlements evacuated 7-14 days after the accident were also obtained from (90)Sr measurements in human bone and whole body. The results of radionuclide intake reconstruction will be used to estimate the internal doses for the members of the EURT cohort.
Cites: Radiat Environ Biophys. 2010 May;49(2):195-20120012750