The first atomic disaster accident of the USSR. Classified. Rare document /1957

Description

The accident was classified. 1957 year
In the fall of 1957, 29 years before the accident at the Chernobyl station, the first atomic disaster in the history of the USSR occurred in the secret Ural city of Chelyabinsk-40. As a result of the explosion of a container in the storage of radioactive waste, a total activity of 20 million curies was released (for comparison, in Chernobyl - 50 million). The radioactive cloud covered an area of 20 thousand square kilometers. Part of it remains a closed territory to this day.
See Wikipedia link
https://en.wikipedia.org/wiki/Kyshtym_disaster
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