SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Soviet atom bomb test at Semipalatinsk. Mushroom cloud from the detonation of the Joe-2 (RDS-2) Soviet nuclear bomb on 24 September 1951 at the Semipalatinsk Test Site in what is now Kazakhstan. This test had a yield of 38 kilotons of TNT. A total of 456 Soviet nuclear tests were conducted at the Semipalatinsk site between 1949 and 1989.
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