Int. J. Environ. Res. Public Health 2009, 6 180 four remaining inhabited settlements along the river, internal and external dose assessments to the resident population have been studied for Muslyumovo and Brodokalmak in particular. Stretching some 6 km along both banks of the Techa River, the village of Muslyumovo, some 47 km downstream of the industrial reservoirs, had a population of 2,550 in 1995, the majority (97 %) being Bashkir. The village of Brodokalmak stretches 4.5 km along the Techa River, 40 km downstream from Muslyumovo and had a population of 3,700 in 1995, mostly Russian (86 %). Inhabitants of both villages work mainly with local agriculture. About 7,500 people were evacuated from 20 settlements and villages along the Techa River between 1953 and 1960 (Figure 3) due to direct releases, after receiving average effective radiation doses ranging from 35-1,700 mSv [15]. The EURT exposed populations in some districts of the Chelyabinsk, Sverdlovsk and Tyumen Regions (about 20,000 km2 with initial depositions over 3.7 kBq m-2 90Sr [1]), amounting to 270,000 people in 217 settlements [15]. Approximately 10,200 people were evacuated from the contaminated areas after the Kyshtym accident, the 1,054 residents in the three villages located nearest the accident site receiving the highest doses, with average equivalent doses to red bone marrow of 570 mSv. The collective effective equivalent dose for the evacuated population amounted to some 1,300 personSv, while it was estimated as being 4,500 personSv for the whole population remaining in EURT territory [15]. The 1967 Karachay incident affected an area covering 63 populated regions, with a total population of 41,500 being encompassed by the 3.7 kBq m-2 90Sr isoline. Cs-137 contamination could be divided into two broad areas [1]: 1,800 km2 with contamination densities in the range: 11-210 kBq m-2 and 34 km2 with contamination densities in the range: 210-765 kBq m-2. The average individual dose from external radiation from this contamination was estimated as being 13 mSv for 4800 people living closest to Lake Karachay, while doses of 7 mSv were recorded for more distant populations [15]. Figure 3. Villages along the Techa River showing those that were evacuated due to radioactive discharges from Mayak PA (Muslyumovo is approximately 50 km from Asanovo) [1].