Mayak and Techa River cohorts are not the same
Techa River cohort
"Between 1949 and 1956, the Mayak Radiochemical Plant released approximately 1017 Bq of uranium fission products into the Techa River in the Southern Urals, with 95% of the releases between September 1950 and November 1951 (5,6). Those residing along the river received external γ-radiation exposure from contaminated river sediments and flood plain soil and internal exposure from 90Sr, 137Cs and other radionuclides from the consumption of contaminated water, milk and food products."
Residents of evacuated villages near Mayak
"The East-Urals Radioactive Trace (EURT) resuited from a thermal explosion in September,1957, in a tank containing radioactive waste from a nuclear fuel reprocessing cycle at the radiochemical combine 'Mayak'. The radioactive trace, which was formed after the explosion, affected a number of rural settlements with a population up to 270000 on the territory of the Chelyabinsk, Sverdlovsk and Tyumen provinces (oblasts). Twenty-two villages were located along the axis of the EURT with a total population of 10 000. The residents were evacuated within 7-670 days following the accident, depending on the levels of radioactive contamination.
These two are not the same cohorts, though from the same area.
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