- Kyshtym
Kyshtym ( _ru. Кыштым) is a town in
Chelyabinsk Oblast ,Russia , located on the eastern slope of the SouthUral Mountains some 90 km northwest ofChelyabinsk , near the town of Ozyorsk. Population: 41,929 (2002); 36,000 (1970).Nuclear disaster
Kyshtym is near the
Chelyabinsk-40 nuclear complex, also known as "Mayak " ("lighthouse" in Russian), where on 29th September, 1957, a violent explosion involving dry nitrate and acetate salts in a waste tank containing highly radioactive waste, contaminated an area later called the "Kyshtym footprint". The explosion resulted from a failure of the cooling system of the tank. [ [http://www.american.edu/projects/mandala/TED/ural.htm "Kyshtym accident" "TED Case Studies: An Online Journal" American University] ]There was a release of 40 PBq of
fission product s. Cerium-144 and Zirconium-95 (both relatively short lived isotopes with a half life of 285 and 64 days respectively) made up 91% of the release. There was 1 PBq of Sr-90, and 13 TBq of Cs-137. The contaminated zone, called East Urals Radioactive Trace (EURT), measuring 300 x 50 km was contaminated by more than 4 kBq/m² of Sr-90. The global fallout of Sr-90 was about 2 kBq/m². An area measuring 17 km² was contaminated by about 100 MBq Sr-90/m².There were 270 000 inhabitants of the area. Mass evacuation was carried out as the critical contamination resulted from Sr-90 with a half-life of 28.8 years. About 800 km² of land were taken out of use, and 82% of this area has now been taken into use again for forestry and farming.
The Kyshtym accident was largely concealed by the Soviet government until 1980, when the Soviet biologist
Zhores Medvedev revealed its existence.References
* [http://msshveikin.info/photo/ Photo gallery of Kyshtym]
* [http://msshveikin.info/okyshtym.html Brief history of Kyshtym]
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